All Transactions
Transactions listed are from November 1 of previous year to April 1 of the following year.
- November 2, 1987
Terry Francona of the Cincinnati Reds granted free agency.
The New York Yankees released Juan Bonilla.
The New York Yankees released Al Holland.
The New York Yankees released Lenn Sakata.
The Texas Rangers traded Don Slaught to the New York Yankees for a player to be named later. The New York Yankees sent Brad Arnsberg (November 10, 1987) to the Texas Rangers to complete the trade.
- November 6, 1987
The Atlanta Braves signed Javy López as an amateur free agent.
The Philadelphia Phillies released Ken Dowell.
The Baltimore Orioles traded Terry Crowley (minors) and Rico Rossy to the Pittsburgh Pirates for Joe Orsulak.
The Cincinnati Reds traded Ted Power and Kurt Stillwell to the Kansas City Royals for Danny Jackson and Angel Salazar.
- November 7, 1987
The Minnesota Twins signed Eric Bullock as a free agent.
- November 8, 1987
Bob Dernier of the Chicago Cubs granted free agency.
- November 9, 1987
Bill Almon of the New York Mets granted free agency.
Larry Andersen of the Houston Astros granted free agency.
Joaquín Andújar of the Oakland Athletics granted free agency.
Chris Bando of the Cleveland Indians granted free agency.
Juan Berenguer of the Minnesota Twins granted free agency.
Bruce Bochy of the San Diego Padres granted free agency.
Thad Bosley of the Kansas City Royals granted free agency.
Brett Butler of the Cleveland Indians granted free agency.
John Candelaria of the New York Mets granted free agency.
Jack Clark of the St. Louis Cardinals granted free agency.
Mark Clear of the Milwaukee Brewers granted free agency.
Dave Collins of the Cincinnati Reds granted free agency.
Steve Crawford of the Boston Red Sox granted free agency.
José Cruz of the Houston Astros granted free agency.
Danny Darwin of the Houston Astros granted free agency.
Chili Davis of the San Francisco Giants granted free agency.
Mike Davis of the Oakland Athletics granted free agency.
Dave Engle of the Montreal Expos granted free agency.
George Frazier of the Minnesota Twins granted free agency.
Gary Gaetti of the Minnesota Twins granted free agency.
Gene Garber of the Kansas City Royals granted free agency.
Phil Garner of the Los Angeles Dodgers granted free agency.
Steve Garvey of the San Diego Padres granted free agency.
Ken Griffey of the Atlanta Braves granted free agency.
Bill Gullickson of the New York Yankees granted free agency.
Moose Haas of the Oakland Athletics granted free agency.
Atlee Hammaker of the San Francisco Giants granted free agency.
Terry Harper of the Pittsburgh Pirates granted free agency.
Mike Heath of the Detroit Tigers granted free agency.
Dave Henderson of the San Francisco Giants granted free agency.
Steve Henderson of the Oakland Athletics granted free agency.
Glenn Hubbard of the Atlanta Braves granted free agency.
Garth Iorg of the Toronto Blue Jays granted free agency.
Tommy John of the New York Yankees granted free agency.
Ruppert Jones of the California Angels granted free agency.
Mike LaCoss of the San Francisco Giants granted free agency.
Ken Landreaux of the Los Angeles Dodgers granted free agency.
Dave LaPoint of the Chicago White Sox granted free agency.
Tim Laudner of the Minnesota Twins granted free agency.
Gary Lavelle of the Oakland Athletics granted free agency.
Charlie Lea of the Montreal Expos granted free agency.
Charlie Leibrandt of the Kansas City Royals granted free agency.
Gary Lucas of the California Angels granted free agency.
Ed Lynch of the Chicago Cubs granted free agency.
Bill Madlock of the Detroit Tigers granted free agency.
Rick Manning of the Milwaukee Brewers granted free agency.
Dennis Martínez of the Montreal Expos granted free agency.
Gary Matthews of the Seattle Mariners granted free agency.
Lee Mazzilli of the New York Mets granted free agency.
Bob McClure of the Montreal Expos granted free agency.
Eddie Milner of the San Francisco Giants granted free agency.
Greg Minton of the California Angels granted free agency.
Paul Molitor of the Milwaukee Brewers granted free agency.
Bill Mooneyham of the Milwaukee Brewers granted free agency.
Jack Morris of the Detroit Tigers granted free agency.
Dwayne Murphy of the Oakland Athletics granted free agency.
Graig Nettles of the Atlanta Braves granted free agency.
Reid Nichols of the Montreal Expos granted free agency.
Dickie Noles of the Chicago Cubs granted free agency.
Tom Paciorek of the Texas Rangers granted free agency.
David Palmer of the Atlanta Braves granted free agency.
Joe Price of the San Francisco Giants granted free agency.
Jamie Quirk of the Kansas City Royals granted free agency.
Jerry Reuss of the California Angels granted free agency.
Dave Righetti of the New York Yankees granted free agency.
Joe Sambito of the Boston Red Sox granted free agency.
Bryn Smith of the Montreal Expos granted free agency.
Dave Smith of the Houston Astros granted free agency.
Frank Tanana of the Detroit Tigers granted free agency.
Dickie Thon of the Houston Astros granted free agency.
Manny Trillo of the Chicago Cubs granted free agency.
Ed Vande Berg of the Cleveland Indians granted free agency.
Mike Witt of the California Angels granted free agency.
Joel Youngblood of the San Francisco Giants granted free agency.
The St. Louis Cardinals released Dan Driessen.
The Detroit Tigers released Larry Herndon.
- November 10, 1987
The Milwaukee Brewers signed Odell Jones as a free agent.
The Oakland Athletics signed Ed Jurak as a free agent.
- November 11, 1987
The Milwaukee Brewers signed Bryan Clutterbuck as a free agent.
The Milwaukee Brewers signed Bill Mooneyham as a free agent.
The New York Yankees signed Steve Shields as a free agent.
The New York Mets traded Terry Blocker to the Atlanta Braves for a player to be named later. The Atlanta Braves sent Kevin Brown (December 8, 1987) to the New York Mets to complete the trade.
- November 12, 1987
The Texas Rangers signed DeWayne Vaughn as a free agent.
The Texas Rangers signed José Oliva as an amateur free agent.
The Minnesota Twins released Jeff Bittiger.
The Pittsburgh Pirates released Logan Easley.
The Los Angeles Dodgers released Bill Krueger.
The Houston Astros released Davey Lopes.
The Los Angeles Dodgers released Orlando Mercado.
The Chicago White Sox traded Richard Dotson and Scott Nielsen to the New York Yankees for Dan Pasqua, Steve Rosenberg and Mark Salas.
- November 13, 1987
The Atlanta Braves signed Ken Griffey as a free agent.
- November 15, 1987
Bill Laskey of the Detroit Tigers granted free agency.
- November 16, 1987
The Chicago White Sox signed Jeff Schaefer as a free agent.
- November 17, 1987
The New York Yankees signed Álvaro Espinoza as a free agent.
- November 18, 1987
The Kansas City Royals signed Bob Buchanan as a free agent.
The Seattle Mariners released Jim Weaver.
- November 19, 1987
Vance Law of the Montreal Expos granted free agency.
- November 20, 1987
The Pittsburgh Pirates signed Skeeter Barnes as a free agent.
The Seattle Mariners released Jerry Narron.
- November 21, 1987
The Chicago White Sox signed Mike Woodard as a free agent.
The Los Angeles Dodgers signed Pedro Astacio as an amateur free agent.
- November 22, 1987
Craig McMurtry of the Toronto Blue Jays granted free agency.
The Chicago White Sox released Ray Krawczyk.
- November 23, 1987
The Chicago White Sox released Pat Keedy.
- November 24, 1987
The San Francisco Giants signed Mike LaCoss as a free agent.
The Pittsburgh Pirates signed Tom Romano as a free agent.
- November 27, 1987
The Houston Astros signed Craig Smajstrla as a free agent.
- November 30, 1987
Ron Hassey of the Chicago White Sox granted free agency.
The Cleveland Indians released Andre Thornton.
- December, 1987
The Minnesota Twins signed Francisco Oliveras as a free agent.
- December 1, 1987
The San Francisco Giants signed Brett Butler as a free agent.
The California Angels signed Chili Davis as a free agent.
The Texas Rangers signed Tony Fossas as a free agent.
The Detroit Tigers signed Mike Heath as a free agent.
The San Francisco Giants signed Joel Youngblood as a free agent.
- December 3, 1987
The Pittsburgh Pirates signed Logan Easley as a free agent.
The California Angels signed Greg Minton as a free agent.
- December 5, 1987
The Los Angeles Dodgers signed Tony Arnold as a free agent.
The Los Angeles Dodgers signed Chuck Hensley as a free agent.
The California Angels traded Gary Pettis to the Detroit Tigers for Dan Petry.
- December 6, 1987
The Atlanta Braves signed Graig Nettles as a free agent.
- December 7, 1987
The Baltimore Orioles drafted José Bautista from the New York Mets in the 1987 rule 5 draft.
The Kansas City Royals drafted Luis Encarnación from the Cleveland Indians in the 1987 rule 5 draft.
The Oakland Athletics drafted Doug Jennings from the California Angels in the 1987 rule 5 draft.
The California Angels drafted Joe Johnson from the Toronto Blue Jays in the 1987 rule 5 draft.
The Houston Astros drafted Scott Medvin from the Pittsburgh Pirates in the 1987 rule 5 draft.
The Montreal Expos drafted Rich Sauveur from the Pittsburgh Pirates in the 1987 rule 5 draft.
The Boston Red Sox drafted John Trautwein from the Montreal Expos in the 1987 rule 5 draft.
The Detroit Tigers drafted John Wetteland from the Los Angeles Dodgers in the 1987 rule 5 draft.
The Cleveland Indians signed Chris Bando as a free agent.
The Minnesota Twins signed T.R. Bryden as a free agent.
The Minnesota Twins signed Bryan Clark as a free agent.
The Montreal Expos signed Dave Engle as a free agent.
The Chicago White Sox signed Dave Gallagher as a free agent.
The Kansas City Royals signed Gene Garber as a free agent.
The Oakland Athletics signed Gary Lavelle as a free agent.
The Montreal Expos signed Bob McClure as a free agent.
The Minnesota Twins signed Don Schulze as a free agent.
The Chicago White Sox signed Dar Smith as a free agent.
The Chicago Cubs signed Manny Trillo as a free agent.
- December 8, 1987
The St. Louis Cardinals drafted Gibson Alba from the Milwaukee Brewers in the 1987 minor league draft.
The Milwaukee Brewers drafted Matías Carrillo from the Pittsburgh Pirates in the 1987 minor league draft.
The Chicago White Sox drafted Rodney McCray from the San Diego Padres in the 1987 minor league draft.
The Cleveland Indians drafted Todd Pratt from the Boston Red Sox in the 1987 minor league draft.
The Detroit Tigers signed Dave Beard as a free agent.
The Cincinnati Reds signed Dave Collins as a free agent.
The Philadelphia Phillies signed Bob Dernier as a free agent.
The Texas Rangers signed Craig McMurtry as a free agent.
The Los Angeles Dodgers traded a player to be named later to the Boston Red Sox for Glenn Hoffman. The Los Angeles Dodgers sent Billy Bartels (minors) (December 8, 1987) to the Boston Red Sox to complete the trade.
The Atlanta Braves traded Rafael Ramírez and cash to the Houston Astros for Mike Stoker (minors) and Ed Whited.
The Baltimore Orioles traded a player to be named later and Blaine Beatty to the New York Mets for Doug Sisk. The Baltimore Orioles sent Greg Talamantez (minors) (December 11, 1987) to the New York Mets to complete the trade.
The Boston Red Sox traded Al Nipper and Calvin Schiraldi to the Chicago Cubs for Lee Smith.
The Cincinnati Reds traded Dave Parker to the Oakland Athletics for Tim Birtsas and José Rijo.
- December 9, 1987
The Oakland Athletics signed Ron Hassey as a free agent.
The Oakland Athletics signed Ross Jones as a free agent.
The Chicago White Sox signed Sap Randall as a free agent.
The Baltimore Orioles traded Ken Dixon to the Seattle Mariners for Mike Morgan.
The San Francisco Giants traded a player to be named later to the Boston Red Sox for Dave Henderson. The San Francisco Giants sent Randy Kutcher (December 9, 1987) to the Boston Red Sox to complete the trade.
The Philadelphia Phillies traded Dave Brundage (minors), Mike Jackson and Glenn Wilson to the Seattle Mariners for Phil Bradley and Tim Fortugno.
- December 10, 1987
The Chicago White Sox traded Floyd Bannister and Dave Cochrane to the Kansas City Royals for Chuck Mount (minors), John Davis, Greg Hibbard and Melido Perez.
- December 11, 1987
The New York Mets signed Ken Dowell as a free agent.
The New York Mets traded Victor Garcia (minors) and Rafael Santana to the New York Yankees for Steve Frey, Phil Lombardi and Darren Reed.
As part of a 3-team trade: The New York Mets sent Jesse Orosco to the Los Angeles Dodgers. The Los Angeles Dodgers sent Bob Welch and Matt Young to the Oakland Athletics. The Los Angeles Dodgers sent Jack Savage to the New York Mets. The Oakland Athletics sent Kevin Tapani and Wally Whitehurst to the New York Mets. The Oakland Athletics sent Alfredo Griffin and Jay Howell to the Los Angeles Dodgers.
- December 12, 1987
The Oakland Athletics traded José Tolentino to the Texas Rangers for Tom Duggan (minors) and Kirk Killingsworth (minors).
- December 13, 1987
The Texas Rangers signed Bárbaro Garbey as a free agent.
The Chicago White Sox released Mike Brown.
- December 14, 1987
The Milwaukee Brewers signed Mark Clear as a free agent.
The Detroit Tigers signed Larry Herndon as a free agent.
The Chicago Cubs signed Vance Law as a free agent.
The San Francisco Giants signed Joe Price as a free agent.
The Boston Red Sox traded Marc Sullivan to the Houston Astros for Randy Randle (minors).
- December 15, 1987
The Los Angeles Dodgers signed Mike Davis as a free agent.
The Oakland Athletics signed Marcos Armas as an amateur free agent.
Bill Caudill of the Oakland Athletics granted free agency.
Reggie Jackson of the Oakland Athletics granted free agency.
The Kansas City Royals released Lonnie Smith.
- December 16, 1987
The Houston Astros signed Pat Keedy as a free agent.
The Montreal Expos signed Bryn Smith as a free agent.
The Kansas City Royals signed Hipólito Pichardo as an amateur free agent.
The Los Angeles Dodgers released Glenn Hoffman.
- December 17, 1987
The New York Mets signed Lee Mazzilli as a free agent.
- December 18, 1987
The Kansas City Royals signed Nick Capra as a free agent.
The Baltimore Orioles signed Kevin Hickey as a free agent.
The Montreal Expos signed Rex Hudler as a free agent.
The Montreal Expos signed Dennis Martínez as a free agent.
The Philadelphia Phillies signed David Palmer as a free agent.
The New York Yankees released Rich Bordi.
The Minnesota Twins traded a player to be named later to the Boston Red Sox for Don Baylor. The Minnesota Twins sent Enrique Rios (minors) (December 18, 1987) to the Boston Red Sox to complete the trade.
- December 21, 1987
The Oakland Athletics signed Dave Henderson as a free agent.
The New York Yankees signed Tommy John as a free agent.
The Kansas City Royals released Steve Balboni.
The Chicago Cubs released Jay Baller.
The Minnesota Twins released Don Baylor.
The Oakland Athletics released Tony Bernazard.
The Houston Astros released Buddy Biancalana.
The Minnesota Twins released Sal Butera.
The Minnesota Twins released Steve Carlton.
The California Angels released Stew Cliburn.
The St. Louis Cardinals released Bill Dawley.
The New York Yankees released Mike Easler.
The St. Louis Cardinals released Bob Forsch.
The Texas Rangers released Greg Harris.
The Chicago White Sox released Bob James.
The New York Yankees released Ron Kittle.
The Seattle Mariners released John Moses.
The San Francisco Giants released Phil Ouellette.
The Oakland Athletics released Tony Phillips.
The Texas Rangers released Darrell Porter.
The Seattle Mariners released Domingo Ramos.
The Oakland Athletics released Rick Rodriguez.
The Minnesota Twins released Dan Schatzeder.
The Minnesota Twins released Mike Smithson.
The Baltimore Orioles released Ron Washington.
- December 22, 1987
The Minnesota Twins signed Juan Berenguer as a free agent.
The California Angels signed Ray Krawczyk as a free agent.
The California Angels signed Mike Witt as a free agent.
The New York Yankees traded Henry Cotto and Steve Trout to the Seattle Mariners for Lee Guetterman, Clay Parker and Wade Taylor.
- December 23, 1987
The New York Yankees signed Dave Righetti as a free agent.
The Oakland Athletics signed Brian Snyder as a free agent.
The Los Angeles Dodgers traded Scott May to the Texas Rangers for Javier Ortiz.
- December 24, 1987
The Chicago White Sox signed Kelly Paris as a free agent.
- December 28, 1987
The Cleveland Indians signed Ron Washington as a free agent.
- December 29, 1987
The Houston Astros signed Luis DeLeón as a free agent.
The Detroit Tigers signed Jack Morris as a free agent.
The Minnesota Twins signed Rich Garcés as an amateur free agent.
- December 30, 1987
The Detroit Tigers signed Mike Brown as a free agent.
- Before 1988 Season
The California Angels released Ray Chadwick.
Darryl Motley sent from ??? to the California Angels in an unknown transaction.
Bryan Oelkers sent from the Cleveland Indians to ??? in an unknown transaction.
Dwight Taylor sent from the Kansas City Royals to the Montreal Expos in an unknown transaction.
George Wright sent from the Montreal Expos to ??? in an unknown transaction.
- January, 1988
The Minnesota Twins signed Victor Rodriguez as a free agent.
- January 1, 1988
The Los Angeles Dodgers signed Bill Krueger as a free agent.
The Cleveland Indians signed Bill Laskey as a free agent.
- January 4, 1988
The Minnesota Twins signed Brian Harper as a free agent.
The St. Louis Cardinals signed Bob Horner as a free agent.
- January 5, 1988
The Kansas City Royals signed Thad Bosley as a free agent.
The Minnesota Twins signed Sal Butera as a free agent.
The Boston Red Sox signed Dennis Lamp as a free agent.
The Milwaukee Brewers signed Paul Molitor as a free agent.
The Cincinnati Reds signed Ron Roenicke as a free agent.
The Oakland Athletics signed Matt Sinatro as a free agent.
The Los Angeles Dodgers signed Don Sutton as a free agent.
- January 6, 1988
The New York Yankees signed Jack Clark as a free agent.
- January 7, 1988
The Minnesota Twins signed Gary Gaetti as a free agent.
The Kansas City Royals signed Charlie Leibrandt as a free agent.
The Montreal Expos signed Carlos Pérez as an amateur free agent.
- January 8, 1988
The New York Mets signed Bill Almon as a free agent.
The Houston Astros signed Larry Andersen as a free agent.
The Houston Astros signed Joaquín Andújar as a free agent.
The Houston Astros signed Danny Darwin as a free agent.
The San Francisco Giants signed Atlee Hammaker as a free agent.
The Houston Astros signed Dave Smith as a free agent.
The Cleveland Indians signed Paul Zuvella as a free agent.
- January 11, 1988
The Seattle Mariners signed Brian Giles as a free agent.
The Oakland Athletics signed Glenn Hubbard as a free agent.
- January 12, 1988
The Milwaukee Brewers released Cecil Cooper.
- January 14, 1988
The Oakland Athletics signed Orlando Mercado as a free agent.
- January 15, 1988
The New York Yankees signed John Candelaria as a free agent.
The Cleveland Indians signed Rick Rodriguez as a free agent.
- January 18, 1988
The Milwaukee Brewers signed Jim Adduci as a free agent.
The Boston Red Sox signed Mike Smithson as a free agent.
The Cincinnati Reds signed Lary Sorensen as a free agent.
The Minnesota Twins signed Kelvin Torve as a free agent.
- January 19, 1988
The Cleveland Indians signed Greg Harris as a free agent.
The Texas Rangers signed Steve Kemp as a free agent.
The Cleveland Indians signed John Moses as a free agent.
The Seattle Mariners signed John Rabb as a free agent.
The Milwaukee Brewers signed Ronn Reynolds as a free agent.
The Texas Rangers released Steve Howe.
The Chicago White Sox traded Darrell Pruitt (minors) to the Cincinnati Reds for Carl Willis.
- January 20, 1988
The Pittsburgh Pirates signed Dave Hostetler as a free agent.
- January 22, 1988
The Chicago White Sox signed Jeff Bittiger as a free agent.
The California Angels signed Stew Cliburn as a free agent.
Juan Beníquez of the Toronto Blue Jays granted free agency.
Tom Brookens of the Detroit Tigers granted free agency.
Carlton Fisk of the Chicago White Sox granted free agency.
Kirk Gibson of the Detroit Tigers granted free agency.
Donnie Moore of the California Angels granted free agency.
Joe Niekro of the Minnesota Twins granted free agency.
Butch Wynegar of the California Angels granted free agency.
- January 24, 1988
The Cleveland Indians signed Roberto Rivera as an amateur free agent.
- January 25, 1988
The Toronto Blue Jays signed Juan Beníquez as a free agent.
The Kansas City Royals signed Jamie Quirk as a free agent.
- January 26, 1988
The Toronto Blue Jays signed Graeme Lloyd as an amateur free agent.
- January 27, 1988
The Atlanta Braves signed Juan Eichelberger as a free agent.
The St. Louis Cardinals signed Bob Forsch as a free agent.
The Baltimore Orioles signed Bill Scherrer as a free agent.
- January 28, 1988
The San Francisco Giants signed Phil Garner as a free agent.
- January 29, 1988
The Oakland Athletics signed Rich Bordi as a free agent.
The Minnesota Twins signed Steve Carlton as a free agent.
The Los Angeles Dodgers signed Kirk Gibson as a free agent.
The Cincinnati Reds signed Ron Oester as a free agent.
The Chicago White Sox signed José Segura as a free agent.
The Houston Astros signed Jim Weaver as a free agent.
- February, 1988
The Baltimore Orioles signed Max Venable as a free agent.
- February 1, 1988
The Cleveland Indians signed Domingo Ramos as a free agent.
The St. Louis Cardinals signed Duane Walker as a free agent.
- February 2, 1988
The Chicago White Sox signed Ravelo Manzanillo as a free agent.
The Texas Rangers signed Ed Vande Berg as a free agent.
The Texas Rangers released Larry McWilliams.
- February 3, 1988
The Minnesota Twins signed Tim Laudner as a free agent.
The Cleveland Indians signed Doug Piatt as an amateur free agent.
The Kansas City Royals traded Dave Cochrane to the Seattle Mariners for Ken Spratke (minors).
- February 4, 1988
The Minnesota Twins signed Charlie Lea as a free agent.
The Baltimore Orioles signed Manny Alexander as an amateur free agent.
- February 5, 1988
The Minnesota Twins traded Chris Calvert (minors) to the Philadelphia Phillies for Freddie Toliver.
- February 6, 1988
The Baltimore Orioles signed César Devarez as an amateur free agent.
- February 9, 1988
The Oakland Athletics signed Don Baylor as a free agent.
The Detroit Tigers signed Tom Brookens as a free agent.
The Chicago White Sox signed Carlton Fisk as a free agent.
The Cleveland Indians signed Ron Kittle as a free agent.
The Chicago White Sox signed Dave LaPoint as a free agent.
The California Angels signed Donnie Moore as a free agent.
The Minnesota Twins signed Joe Niekro as a free agent.
The Pittsburgh Pirates signed Dave Rucker as a free agent.
The Cleveland Indians signed Dan Schatzeder as a free agent.
The California Angels signed Butch Wynegar as a free agent.
The Chicago White Sox traded José DeLeón to the St. Louis Cardinals for Ricky Horton, Lance Johnson and cash.
- February 10, 1988
The Philadelphia Phillies signed Bill Dawley as a free agent.
The Cincinnati Reds signed Eddie Milner as a free agent.
- February 11, 1988
The Montreal Expos traded Bob Sudo (minors) to the St. Louis Cardinals for Marty Pevey.
The Chicago White Sox traded a player to be named later to the San Diego Padres for Ed Wojna. The Chicago White Sox sent Joel McKeon (February 11, 1988) to the San Diego Padres to complete the trade.
- February 12, 1988
The St. Louis Cardinals signed Larry McWilliams as a free agent.
The Chicago Cubs traded Mike Brumley and Keith Moreland to the San Diego Padres for Rich Gossage and Ray Hayward.
- February 15, 1988
The Cincinnati Reds traded Jeff Montgomery to the Kansas City Royals for Van Snider.
- February 16, 1988
The Baltimore Orioles traded Rick Carriger (minors), Doug Cinnella (minors) and John Hoover to the Montreal Expos for Al Cardwood (minors) and Jay Tibbs.
- February 17, 1988
The Chicago Cubs signed Jay Baller as a free agent.
The Detroit Tigers signed Frank Tanana as a free agent.
The Montreal Expos signed Alberto Reyes as an amateur free agent.
- February 18, 1988
The Kansas City Royals signed Steve Balboni as a free agent.
The San Diego Padres signed Dickie Thon as a free agent.
The Oakland Athletics signed Johnny Guzman as an amateur free agent.
- February 20, 1988
The Detroit Tigers signed Luis Salazar as a free agent.
- February 22, 1988
The Cleveland Indians signed Chris Codiroli as a free agent.
The Toronto Blue Jays signed Mark Ross as a free agent.
- February 24, 1988
The Detroit Tigers traded Doug Baker to the Minnesota Twins for Julius McDougal (minors).
- February 25, 1988
The New York Yankees signed José Cruz as a free agent.
- February 27, 1988
The Baltimore Orioles traded Ray Knight to the Detroit Tigers for Mark Thurmond.
- February 28, 1988
The Cleveland Indians signed Terry Francona as a free agent.
- February 29, 1988
The Montreal Expos signed Miguel Batista as an amateur free agent.
- March, 1988
The Minnesota Twins released Bryan Clark.
The Baltimore Orioles released Max Venable.
The Chicago Cubs released Jay Baller.
The Seattle Mariners signed Jay Baller as a free agent.
- March 1, 1988
The Seattle Mariners signed Jim Wilson as a free agent.
- March 5, 1988
The Montreal Expos signed Otis Nixon as a free agent.
- March 9, 1988
The Oakland Athletics signed Tony Phillips as a free agent.
- March 10, 1988
The Houston Astros signed Ernie Camacho as a free agent.
The Houston Astros signed Steve Henderson as a free agent.
The Boston Red Sox signed Glenn Hoffman as a free agent.
The Oakland Athletics signed Manny Martínez as an amateur free agent.
- March 12, 1988
The Atlanta Braves signed Lonnie Smith as a free agent.
- March 17, 1988
The Cleveland Indians released Mark Huismann.
The Chicago Cubs traded Ray Hayward to the Texas Rangers for Dave Meier and Greg Tabor.
- March 18, 1988
The Minnesota Twins released Sal Butera.
- March 19, 1988
The Los Angeles Dodgers released Ron Davis.
The San Francisco Giants traded Rod Scurry to the Seattle Mariners for a player to be named later. The Seattle Mariners sent Donell Nixon (June 23, 1988) to the San Francisco Giants to complete the trade.
- March 20, 1988
The New York Mets signed Héctor Carrasco as an amateur free agent.
The Kansas City Royals released Tom Gilles.
- March 21, 1988
The Chicago Cubs released Mike Mason.
The New York Mets traded Bill Almon to the Philadelphia Phillies for Vladimir Perez (minors) and Shawn Barton.
The Baltimore Orioles traded a player to be named later and Mike Young to the Philadelphia Phillies for Keith Hughes, Rick Schu and Jeff Stone. The Baltimore Orioles sent Frank Bellino (minors) (June 14, 1988) to the Philadelphia Phillies to complete the trade.
- March 23, 1988
The Detroit Tigers signed Mark Huismann as a free agent.
The Seattle Mariners released Chris Beasley.
The Baltimore Orioles released Jackie Gutiérrez.
The Oakland Athletics traded Rod Beck to the San Francisco Giants for Charlie Corbell (minors).
- March 24, 1988
The Toronto Blue Jays signed Sal Butera as a free agent.
The Montreal Expos purchased Graig Nettles from the Atlanta Braves.
The Cleveland Indians released Greg Harris.
The Detroit Tigers traded Balvino Gálvez to the Minnesota Twins for Billy Beane.
- March 25, 1988
The Cleveland Indians purchased Willie Upshaw from the Toronto Blue Jays.
The Cleveland Indians released Bernardo Brito.
The Chicago White Sox released Jerry Hairston.
The Chicago White Sox released Ray Searage.
The Chicago White Sox released Jim Winn.
The Houston Astros traded Robbie Wine to the Texas Rangers for Mike Loynd.
- March 26, 1988
The Philadelphia Phillies released Doug Bair.
The New York Mets traded Scott Henion (minors) and Randy Milligan to the Pittsburgh Pirates for Tim Drummond and Mackey Sasser.
- March 28, 1988
The Cleveland Indians returned Todd Pratt (earlier draft pick) to the Boston Red Sox.
The Baltimore Orioles released Chris Bushing.
The Cincinnati Reds released Angel Salazar.
The Cincinnati Reds released Lary Sorensen.
The Oakland Athletics released Mickey Tettleton.
The Seattle Mariners released Mike Trujillo.
The Detroit Tigers traded Karl Best to the Minnesota Twins for Don Schulze.
The Atlanta Braves traded Jeff Dedmon to the Cleveland Indians for a player to be named later. The Cleveland Indians sent Tommy Kurczewski (minors) (June 22, 1988) to the Atlanta Braves to complete the trade.
- March 29, 1988
The Detroit Tigers returned John Wetteland (earlier draft pick) to the Los Angeles Dodgers.
The Chicago White Sox signed Jerry Reuss as a free agent.
The New York Yankees released Pete Filson.
The Cincinnati Reds released Guy Hoffman.
The Philadelphia Phillies released Garland Kiser.
The Cleveland Indians released John Moses.
The San Francisco Giants released Jon Perlman.
The California Angels released Mark Ryal.
The Texas Rangers released Ed Vande Berg.
The Cleveland Indians released Frank Wills.
The Baltimore Orioles traded Tom Michno (minors) and Nick Ramirez (minors) to the Chicago Cubs for Wade Rowdon.
- March 30, 1988
The Los Angeles Dodgers signed Rick Dempsey as a free agent.
The California Angels traded Ted Milner (minors) to the Cleveland Indians for Junior Noboa.
The New York Yankees traded Orestes Destrade to the Pittsburgh Pirates for Hipólito Peña.
- March 31, 1988
The Minnesota Twins signed Bernardo Brito as a free agent.
The Chicago Cubs signed Angel Salazar as a free agent.
The Detroit Tigers signed Mike Trujillo as a free agent.
The Chicago Cubs traded Mike Curtis (minors) to the Pittsburgh Pirates for Mike Bielecki.
The Minnesota Twins traded Joe Klink to the Oakland Athletics for a player to be named later. The Oakland Athletics sent Russ Kibler (minors) (June 25, 1988) to the Minnesota Twins to complete the trade.
- April 1, 1988
The Philadelphia Phillies signed Greg Harris as a free agent.
The Chicago Cubs traded Luis Quiñones to the Cincinnati Reds for Bill Landrum.
The Los Angeles Dodgers traded Craig Shipley to the New York Mets for John Gibbons.
- April 2, 1988
The Baltimore Orioles signed Dickie Noles as a free agent.
- April 4, 1988
The Houston Astros returned Scott Medvin (earlier draft pick) to the Pittsburgh Pirates.
The New York Yankees signed Pete Filson as a free agent.
The Texas Rangers signed Guy Hoffman as a free agent.
The Minnesota Twins signed Tippy Martinez as a free agent.
The New York Yankees released Rick Cerone.
The Los Angeles Dodgers released Tito Landrum.
The New York Yankees released Jerry Royster.
The Los Angeles Dodgers released Alex Treviño.
- April 5, 1988
The Minnesota Twins signed John Moses as a free agent.
The Los Angeles Dodgers signed Ray Searage as a free agent.
The Baltimore Orioles signed Mickey Tettleton as a free agent.
The Minnesota Twins signed Jim Winn as a free agent.
The Cleveland Indians traded Greg LaFever (minors) to the Los Angeles Dodgers for Reggie Williams.
- April 6, 1988
The Minnesota Twins signed Tom Gilles as a free agent.
The Cleveland Indians signed Garland Kiser as a free agent.
The Pittsburgh Pirates traded Bill Merrifield (minors) to the Texas Rangers for Dave Sax.
- April 7, 1988
The Toronto Blue Jays signed Doug Bair as a free agent.
The Cleveland Indians signed Jon Perlman as a free agent.
The Toronto Blue Jays signed Frank Wills as a free agent.
- April 8, 1988
The Texas Rangers signed Ed Vande Berg as a free agent.
- April 10, 1988
The Minnesota Twins signed Mike Mason as a free agent.
The Atlanta Braves signed Ramon Caraballo as an amateur free agent.
- April 12, 1988
The Baltimore Orioles signed Tito Landrum as a free agent.
The Houston Astros signed Alex Treviño as a free agent.
- April 13, 1988
The Chicago White Sox traded Tim Hulett to the Montreal Expos for a player to be named later. The Montreal Expos sent Edgar Cáceres (June 15, 1988) to the Chicago White Sox to complete the trade.
- April 14, 1988
The Chicago Cubs signed Pedro Castellano as an amateur free agent.
- April 15, 1988
The Boston Red Sox signed Rick Cerone as a free agent.
- April 17, 1988
The Cincinnati Reds signed Lary Sorensen as a free agent.
- April 21, 1988
The Minnesota Twins released Tippy Martinez.
- April 22, 1988
The Minnesota Twins traded Tom Brunansky to the St. Louis Cardinals for Tom Herr.
- April 28, 1988
The San Francisco Giants signed Larry Carter as a free agent.
The Minnesota Twins released Steve Carlton.
- April 30, 1988
The St. Louis Cardinals signed Mark Ryal as a free agent.
- May, 1988
The Chicago White Sox signed Ray Chadwick as a free agent.
- May 2, 1988
The New York Mets signed Juan Castillo as an amateur free agent.
The Baltimore Orioles released Scott McGregor.
The Baltimore Orioles released Bill Scherrer.
- May 3, 1988
The Baltimore Orioles signed Butch Davis as a free agent.
- May 4, 1988
The Minnesota Twins released Joe Niekro.
- May 5, 1988
The Cincinnati Reds released Lary Sorensen.
- May 7, 1988
The New York Yankees signed Chris Chambliss as a free agent.
The Pittsburgh Pirates released Skeeter Barnes.
- May 9, 1988
The California Angels released Bill Buckner.
The Seattle Mariners released Rich Monteleone.
- May 10, 1988
The Montreal Expos signed Bryan Oelkers as a free agent.
The New York Yankees released Chris Chambliss.
The Baltimore Orioles released Tito Landrum.
- May 11, 1988
The San Francisco Giants signed Ron Davis as a free agent.
The Cleveland Indians signed Dan Firova as a free agent.
- May 12, 1988
The Los Angeles Dodgers signed Steve Crawford as a free agent.
- May 13, 1988
The Kansas City Royals signed Bill Buckner as a free agent.
The California Angels signed Rich Monteleone as a free agent.
The Los Angeles Dodgers purchased Isidro Márquez from San Luis (Mexican).
The Los Angeles Dodgers released Brad Havens.
- May 14, 1988
The Cincinnati Reds signed Skeeter Barnes as a free agent.
- May 17, 1988
The Texas Rangers signed Tito Landrum as a free agent.
The Atlanta Braves signed Jerry Royster as a free agent.
The Atlanta Braves released Dámaso García.
- May 19, 1988
The Chicago Cubs traded Leon Durham to the Cincinnati Reds for Pat Perry and cash.
- May 20, 1988
The Atlanta Braves signed Melvin Nieves as an amateur free agent.
- May 22, 1988
The Oakland Athletics signed Bryan Clark as a free agent.
- May 23, 1988
The Seattle Mariners released John Christensen.
- May 24, 1988
The Cleveland Indians signed Brad Havens as a free agent.
The Montreal Expos signed Wil Cordero as an amateur free agent.
- May 25, 1988
The Texas Rangers released Steve Kemp.
- May 27, 1988
The Kansas City Royals released Steve Balboni.
The Kansas City Royals released Thad Bosley.
- May 28, 1988
The Minnesota Twins signed John Christensen as a free agent.
- May 31, 1988
The Toronto Blue Jays released Juan Beníquez.
- June 1, 1988
The Seattle Mariners signed Steve Balboni as a free agent.
The San Diego Padres drafted Andy Benes in the 1st round (1st pick) of the 1988 amateur draft. Player signed June 20, 1988.
The Cleveland Indians drafted Mark Lewis in the 1st round (2nd pick) of the 1988 amateur draft. Player signed June 7, 1988.
The Atlanta Braves drafted Steve Avery in the 1st round (3rd pick) of the 1988 amateur draft. Player signed June 30, 1988.
The Baltimore Orioles drafted Gregg Olson in the 1st round (4th pick) of the 1988 amateur draft. Player signed June 28, 1988.
The Texas Rangers drafted Monty Fariss in the 1st round (6th pick) of the 1988 amateur draft.
The California Angels drafted Jim Abbott in the 1st round (8th pick) of the 1988 amateur draft. Player signed August 3, 1988.
The Chicago White Sox drafted Robin Ventura in the 1st round (10th pick) of the 1988 amateur draft. Player signed October 21, 1988.
The Philadelphia Phillies drafted Pat Combs in the 1st round (11th pick) of the 1988 amateur draft. Player signed June 12, 1988.
The Seattle Mariners drafted Tino Martinez in the 1st round (14th pick) of the 1988 amateur draft. Player signed June 11, 1988.
The San Francisco Giants drafted Royce Clayton in the 1st round (15th pick) of the 1988 amateur draft. Player signed June 22, 1988.
The Oakland Athletics drafted Stan Royer in the 1st round (16th pick) of the 1988 amateur draft.
The Cleveland Indians drafted Charles Nagy in the 1st round (17th pick) of the 1988 amateur draft. Player signed June 9, 1988.
The Montreal Expos drafted Dave Wainhouse in the 1st round (19th pick) of the 1988 amateur draft.
The St. Louis Cardinals drafted John Ericks in the 1st round (22nd pick) of the 1988 amateur draft. Player signed June 2, 1988.
The Milwaukee Brewers drafted Alex Fernandez in the 1st round (24th pick) of the 1988 amateur draft, but was not signed.
The Toronto Blue Jays drafted Ed Sprague in the 1st round (25th pick) of the 1988 amateur draft. Player signed June 22, 1988.
The Detroit Tigers drafted Rico Brogna in the 1st round (26th pick) of the 1988 amateur draft. Player signed June 18, 1988.
The Cleveland Indians drafted Jeff Mutis in the 1st round (27th pick) of the 1988 amateur draft.
The Baltimore Orioles drafted Ricky Gutiérrez in the 1st round (28th pick) of the 1988 amateur draft. Player signed June 9, 1988.
The San Francisco Giants drafted Ted Wood in the 1st round (29th pick) of the 1988 amateur draft. Player signed June 10, 1988.
The St. Louis Cardinals drafted Brian Jordan in the 1st round (30th pick) of the 1988 amateur draft. Player signed July 7, 1988.
The Cincinnati Reds drafted Jeff Branson in the 2nd round of the 1988 amateur draft.
The Kansas City Royals drafted Bob Hamelin in the 2nd round of the 1988 amateur draft. Player signed June 11, 1988.
The Atlanta Braves drafted Jimmy Kremers in the 2nd round of the 1988 amateur draft.
The Detroit Tigers drafted Scott Livingstone in the 2nd round of the 1988 amateur draft. Player signed June 8, 1988.
The Atlanta Braves drafted Matt Murray in the 2nd round of the 1988 amateur draft.
The Montreal Expos drafted Chris Nabholz in the 2nd round of the 1988 amateur draft. Player signed August 9, 1988.
The Minnesota Twins drafted Alan Newman in the 2nd round of the 1988 amateur draft. Player signed June 4, 1988.
The Seattle Mariners drafted Greg Pirkl in the 2nd round of the 1988 amateur draft. Player signed June 6, 1988.
The Baltimore Orioles drafted Arthur Rhodes in the 2nd round of the 1988 amateur draft. Player signed June 17, 1988.
The Houston Astros drafted Dave Silvestri in the 2nd round of the 1988 amateur draft. Player signed October 18, 1988.
The Oakland Athletics drafted Joe Slusarski in the 2nd round of the 1988 amateur draft. Player signed October 1, 1988.
The Los Angeles Dodgers drafted Billy Ashley in the 3rd round of the 1988 amateur draft. Player signed June 9, 1988.
The Oakland Athletics drafted John Briscoe in the 3rd round of the 1988 amateur draft. Player signed June 12, 1988.
The Montreal Expos drafted Marquis Grissom in the 3rd round of the 1988 amateur draft. Player signed June 13, 1988.
The San Diego Padres drafted Ray Holbert in the 3rd round of the 1988 amateur draft.
The Kansas City Royals drafted Joel Johnston in the 3rd round of the 1988 amateur draft. Player signed June 3, 1988.
The Baltimore Orioles drafted Stacy Jones in the 3rd round of the 1988 amateur draft. Player signed June 8, 1988.
The Philadelphia Phillies drafted Tim Mauser in the 3rd round of the 1988 amateur draft. Player signed June 8, 1988.
The Texas Rangers drafted Darren Oliver in the 3rd round of the 1988 amateur draft. Player signed June 2, 1988.
The New York Mets drafted Doug Saunders in the 3rd round of the 1988 amateur draft.
The Houston Astros drafted Scott Servais in the 3rd round of the 1988 amateur draft. Player signed June 2, 1988.
The Toronto Blue Jays drafted David Weathers in the 3rd round of the 1988 amateur draft. Player signed June 4, 1988.
The Cincinnati Reds drafted Tyler Green in the 3rd round of the 1988 amateur draft, but was not signed.
The Montreal Expos drafted Scott Davison in the 4th round of the 1988 amateur draft. Player signed July 11, 1988.
The Minnesota Twins drafted Steve Dunn in the 4th round of the 1988 amateur draft.
The Houston Astros drafted Luis Gonzalez in the 4th round of the 1988 amateur draft. Player signed June 2, 1988.
The Seattle Mariners drafted Lee Hancock in the 4th round of the 1988 amateur draft. Player signed June 2, 1988.
The California Angels drafted J.R. Phillips in the 4th round of the 1988 amateur draft. Player signed June 2, 1988.
The Chicago White Sox drafted Johnny Ruffin in the 4th round of the 1988 amateur draft. Player signed June 2, 1988.
The San Diego Padres drafted Bryce Florie in the 5th round of the 1988 amateur draft. Player signed June 21, 1988.
The Milwaukee Brewers drafted Pat Listach in the 5th round of the 1988 amateur draft. Player signed June 28, 1988.
The Philadelphia Phillies drafted Mickey Morandini in the 5th round of the 1988 amateur draft. Player signed June 3, 1988.
The Kansas City Royals drafted Tim Spehr in the 5th round of the 1988 amateur draft. Player signed June 21, 1988.
The San Francisco Giants drafted Eddie Tucker in the 5th round of the 1988 amateur draft.
The Boston Red Sox drafted John Valentin in the 5th round of the 1988 amateur draft. Player signed June 27, 1988.
The Atlanta Braves drafted Turk Wendell in the 5th round of the 1988 amateur draft. Player signed June 4, 1988.
The Chicago White Sox drafted Joey Eischen in the 5th round of the 1988 amateur draft, but was not signed.
The Oakland Athletics drafted Joe Grahe in the 5th round of the 1988 amateur draft, but was not signed.
The St. Louis Cardinals drafted Rheal Cormier in the 6th round of the 1988 amateur draft. Player signed June 9, 1988.
The California Angels drafted Gary Disarcina in the 6th round of the 1988 amateur draft. Player signed June 8, 1988.
The Houston Astros drafted Chris Gardner in the 6th round of the 1988 amateur draft.
The New York Yankees drafted Jeff Johnson in the 6th round of the 1988 amateur draft.
The Los Angeles Dodgers drafted Eric Karros in the 6th round of the 1988 amateur draft. Player signed June 17, 1988.
The Montreal Expos drafted Tim Laker in the 6th round of the 1988 amateur draft. Player signed June 3, 1988.
The Minnesota Twins drafted Pat Mahomes in the 6th round of the 1988 amateur draft. Player signed June 6, 1988.
The Baltimore Orioles drafted Tom Martin in the 6th round of the 1988 amateur draft. Player signed August 8, 1988.
The Texas Rangers drafted Rob Maurer in the 6th round of the 1988 amateur draft.
The Pittsburgh Pirates drafted Blas Minor in the 6th round of the 1988 amateur draft. Player signed June 14, 1988.
The New York Mets drafted Kevin Baez in the 7th round of the 1988 amateur draft. Player signed June 7, 1988.
The Montreal Expos drafted Bret Barberie in the 7th round of the 1988 amateur draft.
The California Angels drafted Jim Edmonds in the 7th round of the 1988 amateur draft. Player signed June 21, 1988.
The Milwaukee Brewers drafted Chris George in the 7th round of the 1988 amateur draft.
The Los Angeles Dodgers drafted Jeff Hartsock in the 7th round of the 1988 amateur draft.
The Cleveland Indians drafted Greg McMichael in the 7th round of the 1988 amateur draft. Player signed June 8, 1988.
The Pittsburgh Pirates drafted John Wehner in the 7th round of the 1988 amateur draft. Player signed June 5, 1988.
The Oakland Athletics drafted Ron Witmeyer in the 7th round of the 1988 amateur draft.
The Chicago White Sox drafted Rich Batchelor in the 7th round of the 1988 amateur draft, but was not signed.
The Milwaukee Brewers drafted Mike Ignasiak in the 8th round of the 1988 amateur draft.
The Boston Red Sox drafted Tim Naehring in the 8th round of the 1988 amateur draft. Player signed June 10, 1988.
The San Diego Padres drafted Nikco Riesgo in the 8th round of the 1988 amateur draft.
The Pittsburgh Pirates drafted Tim Wakefield in the 8th round of the 1988 amateur draft. Player signed June 3, 1988.
The Atlanta Braves drafted Mark Wohlers in the 8th round of the 1988 amateur draft. Player signed June 9, 1988.
The Toronto Blue Jays drafted Tim Pugh in the 8th round of the 1988 amateur draft, but was not signed.
The St. Louis Cardinals drafted Mark Clark in the 9th round of the 1988 amateur draft. Player signed June 3, 1988.
The Milwaukee Brewers drafted Bert Heffernan in the 9th round of the 1988 amateur draft. Player signed June 2, 1988.
The New York Yankees drafted Pat Kelly in the 9th round of the 1988 amateur draft. Player signed June 2, 1988.
The Detroit Tigers drafted Kurt Knudsen in the 9th round of the 1988 amateur draft.
The Cleveland Indians drafted Brett Merriman in the 9th round of the 1988 amateur draft.
The Los Angeles Dodgers drafted Jim Poole in the 9th round of the 1988 amateur draft. Player signed June 9, 1988.
The San Francisco Giants drafted Kevin Rogers in the 9th round of the 1988 amateur draft. Player signed June 8, 1988.
The Minnesota Twins drafted Doug Simons in the 9th round of the 1988 amateur draft.
The Seattle Mariners drafted Steve Chitren in the 9th round of the 1988 amateur draft, but was not signed.
The New York Yankees drafted Kenny Greer in the 10th round of the 1988 amateur draft. Player signed June 2, 1988.
The St. Louis Cardinals drafted Joe Hall in the 10th round of the 1988 amateur draft. Player signed June 9, 1988.
The Chicago White Sox drafted John Hudek in the 10th round of the 1988 amateur draft. Player signed June 5, 1988.
The Los Angeles Dodgers drafted Eddie Pye in the 10th round of the 1988 amateur draft. Player signed June 3, 1988.
The San Diego Padres drafted A.J. Sager in the 10th round of the 1988 amateur draft. Player signed June 6, 1988.
The Pittsburgh Pirates drafted Joe Ausanio in the 11th round of the 1988 amateur draft. Player signed June 10, 1988.
The Minnesota Twins drafted J.T. Bruett in the 11th round of the 1988 amateur draft.
The New York Yankees drafted Andy Cook in the 11th round of the 1988 amateur draft.
The Montreal Expos drafted Reid Cornelius in the 11th round of the 1988 amateur draft. Player signed August 6, 1988.
The California Angels drafted Scott Lewis in the 11th round of the 1988 amateur draft. Player signed June 11, 1988.
The Kansas City Royals drafted Mike Magnante in the 11th round of the 1988 amateur draft. Player signed June 14, 1988.
The Cleveland Indians drafted Jorge Fábregas in the 11th round of the 1988 amateur draft, but was not signed.
The Los Angeles Dodgers drafted Jerry Brooks in the 12th round of the 1988 amateur draft. Player signed June 9, 1988.
The Cincinnati Reds drafted Steve Foster in the 12th round of the 1988 amateur draft.
The Baltimore Orioles drafted Pete Rose Jr. in the 12th round of the 1988 amateur draft. Player signed September 1, 1988.
The New York Yankees drafted Frank Seminara in the 12th round of the 1988 amateur draft.
The Philadelphia Phillies drafted Scott Hatteberg in the 12th round of the 1988 amateur draft, but was not signed.
The Seattle Mariners drafted Jeff Darwin in the 13th round of the 1988 amateur draft. Player signed August 12, 1988.
The Cincinnati Reds drafted Paul Byrd in the 13th round of the 1988 amateur draft, but was not signed.
The California Angels drafted Mike Robertson in the 13th round of the 1988 amateur draft, but was not signed.
The Kansas City Royals drafted Victor Cole in the 14th round of the 1988 amateur draft.
The Los Angeles Dodgers drafted Dana Allison in the 14th round of the 1988 amateur draft, but was not signed.
The Oakland Athletics drafted Rod Correia in the 15th round of the 1988 amateur draft. Player signed June 2, 1988.
The Detroit Tigers drafted Dave Haas in the 15th round of the 1988 amateur draft. Player signed June 15, 1988.
The San Diego Padres drafted Mike Humphreys in the 15th round of the 1988 amateur draft.
The New York Yankees drafted Bobby Muñoz in the 15th round of the 1988 amateur draft. Player signed October 5, 1988.
The Atlanta Braves drafted Tony Tarasco in the 15th round of the 1988 amateur draft. Player signed June 13, 1988.
The Seattle Mariners drafted Scott Taylor in the 15th round of the 1988 amateur draft. Player signed August 10, 1988.
The Philadelphia Phillies drafted Tom Marsh in the 16th round of the 1988 amateur draft. Player signed June 2, 1988.
The Kansas City Royals drafted Kerwin Moore in the 16th round of the 1988 amateur draft. Player signed June 3, 1988.
The Chicago Cubs drafted Kevin Roberson in the 16th round of the 1988 amateur draft. Player signed June 10, 1988.
The Los Angeles Dodgers drafted Brian Traxler in the 16th round of the 1988 amateur draft.
The Houston Astros drafted Kenny Lofton in the 17th round of the 1988 amateur draft. Player signed June 16, 1988.
The California Angels drafted Marcus Moore in the 17th round of the 1988 amateur draft.
The Detroit Tigers drafted Rich Rowland in the 17th round of the 1988 amateur draft. Player signed June 4, 1988.
The Oakland Athletics drafted Darren Lewis in the 18th round of the 1988 amateur draft. Player signed June 8, 1988.
The New York Yankees drafted Jerry Nielsen in the 18th round of the 1988 amateur draft.
The Pittsburgh Pirates drafted Randy Tomlin in the 18th round of the 1988 amateur draft.
The Montreal Expos drafted Darrin Winston in the 18th round of the 1988 amateur draft. Player signed June 7, 1988.
The Boston Red Sox drafted Hilly Hathaway in the 18th round of the 1988 amateur draft, but was not signed.
The Pittsburgh Pirates drafted Mandy Romero in the 19th round of the 1988 amateur draft. Player signed June 6, 1988.
The Cincinnati Reds drafted Jerry Spradlin in the 19th round of the 1988 amateur draft. Player signed June 3, 1988.
The Houston Astros drafted Mike Durant in the 19th round of the 1988 amateur draft, but was not signed.
The San Francisco Giants drafted Steve Decker in the 21st round of the 1988 amateur draft. Player signed June 6, 1988.
The California Angels drafted Larry Gonzales in the 22nd round of the 1988 amateur draft.
The Pittsburgh Pirates drafted Dave Staton in the 22nd round of the 1988 amateur draft, but was not signed.
The Oakland Athletics drafted Bronswell Patrick in the 23rd round of the 1988 amateur draft. Player signed June 16, 1988.
The San Francisco Giants drafted John Patterson in the 23rd round of the 1988 amateur draft.
The New York Mets drafted Mike Kelly in the 24th round of the 1988 amateur draft, but was not signed.
The Boston Red Sox drafted John Flaherty in the 25th round of the 1988 amateur draft. Player signed June 9, 1988.
The San Francisco Giants drafted Reggie Williams in the 25th round of the 1988 amateur draft. Player signed June 6, 1988.
The Baltimore Orioles drafted Brian Barnes in the 25th round of the 1988 amateur draft, but was not signed.
The New York Yankees drafted Mike Draper in the 26th round of the 1988 amateur draft.
The Boston Red Sox drafted Scott Taylor in the 28th round of the 1988 amateur draft. Player signed June 7, 1988.
The Toronto Blue Jays drafted Woody Williams in the 28th round of the 1988 amateur draft. Player signed June 5, 1988.
The Baltimore Orioles drafted Joey Hamilton in the 28th round of the 1988 amateur draft, but was not signed.
The New York Yankees drafted Russ Davis in the 29th round of the 1988 amateur draft. Player signed June 5, 1988.
The Seattle Mariners drafted Kerry Woodson in the 29th round of the 1988 amateur draft.
The California Angels drafted Damion Easley in the 30th round of the 1988 amateur draft. Player signed May 24, 1989.
The Texas Rangers drafted Jeff Frye in the 30th round of the 1988 amateur draft. Player signed June 8, 1988.
The New York Yankees drafted Deion Sanders in the 30th round of the 1988 amateur draft. Player signed June 22, 1988.
The Chicago White Sox drafted John DeSilva in the 30th round of the 1988 amateur draft, but was not signed.
The Toronto Blue Jays drafted Mike Matheny in the 31st round of the 1988 amateur draft, but was not signed.
The New York Yankees drafted Joe Vitiello in the 31st round of the 1988 amateur draft, but was not signed.
The Toronto Blue Jays drafted Greg O'Halloran in the 32nd round of the 1988 amateur draft. Player signed October 18, 1988.
The Cincinnati Reds drafted Mo Sanford in the 32nd round of the 1988 amateur draft. Player signed June 4, 1988.
The New York Yankees drafted John Cummings in the 32nd round of the 1988 amateur draft, but was not signed.
The Boston Red Sox drafted Peter Hoy in the 33rd round of the 1988 amateur draft. Player signed August 10, 1988.
The Toronto Blue Jays drafted George Tsamis in the 33rd round of the 1988 amateur draft, but was not signed.
The Texas Rangers drafted Tom Urbani in the 34th round of the 1988 amateur draft, but was not signed.
The Los Angeles Dodgers drafted Héctor Ortiz in the 35th round of the 1988 amateur draft. Player signed June 14, 1988.
The Minnesota Twins drafted Aaron Sele in the 37th round of the 1988 amateur draft, but was not signed.
The Toronto Blue Jays drafted Ray Giannelli in the 38th round of the 1988 amateur draft. Player signed June 6, 1988.
The New York Mets drafted Joe Vitko in the 38th round of the 1988 amateur draft, but was not signed.
The Atlanta Braves drafted Scott Ruffcorn in the 39th round of the 1988 amateur draft, but was not signed.
The Philadelphia Phillies drafted Paul Fletcher in the 40th round of the 1988 amateur draft. Player signed June 5, 1988.
The Chicago Cubs drafted Jessie Hollins in the 40th round of the 1988 amateur draft.
The Seattle Mariners drafted Chris Howard in the 41st round of the 1988 amateur draft.
The Houston Astros drafted Chris Tremie in the 41st round of the 1988 amateur draft, but was not signed.
The Chicago White Sox drafted Derek Lee in the 42nd round of the 1988 amateur draft. Player signed June 9, 1988.
The Los Angeles Dodgers drafted Garey Ingram in the 43rd round of the 1988 amateur draft, but was not signed.
The San Diego Padres drafted Brian Looney in the 43rd round of the 1988 amateur draft, but was not signed.
The New York Yankees drafted Orlando Palmeiro in the 43rd round of the 1988 amateur draft, but was not signed.
The Toronto Blue Jays drafted Scott Erickson in the 44th round of the 1988 amateur draft, but was not signed.
The Chicago White Sox drafted Ozzie Timmons in the 44th round of the 1988 amateur draft, but was not signed.
The Toronto Blue Jays drafted Dax Jones in the 49th round of the 1988 amateur draft, but was not signed.
The New York Yankees drafted Fernando Viña in the 51st round of the 1988 amateur draft, but was not signed.
The Philadelphia Phillies drafted Steve Cooke in the 53rd round of the 1988 amateur draft, but was not signed.
The Toronto Blue Jays drafted Jason Wood in the 56th round of the 1988 amateur draft, but was not signed.
The Philadelphia Phillies drafted Jeff Patterson in the 58th round of the 1988 amateur draft.
The Texas Rangers drafted Shannon Penn in the 58th round of the 1988 amateur draft.
The Toronto Blue Jays drafted Darrell Whitmore in the 58th round of the 1988 amateur draft, but was not signed.
The Cincinnati Reds drafted Don Wengert in the 60th round of the 1988 amateur draft, but was not signed.
The Los Angeles Dodgers drafted Mike Piazza in the 62nd round of the 1988 amateur draft. Player signed July 11, 1988.
- June 2, 1988
The Cleveland Indians signed Houston Jiménez as a free agent.
The San Diego Padres signed Pablo Martínez as an amateur free agent.
- June 3, 1988
The Cleveland Indians traded Pat Tabler to the Kansas City Royals for Bud Black.
- June 4, 1988
The Chicago White Sox signed Pedro Borbón as an amateur free agent.
- June 5, 1988
The Detroit Tigers signed Dwayne Murphy as a free agent.
- June 6, 1988
The Los Angeles Dodgers signed Raúl Mondesí as an amateur free agent.
The Detroit Tigers released Jim Morrison.
- June 7, 1988
The California Angels signed Thad Bosley as a free agent.
The Cleveland Indians traded Brian Dorsett to the California Angels for a player to be named later. The California Angels sent Colby Ward (July 15, 1989) to the Cleveland Indians to complete the trade.
- June 8, 1988
The San Diego Padres released Jim Tatum.
The Cincinnati Reds traded Dennis Rasmussen to the San Diego Padres for Candy Sierra.
The Milwaukee Brewers traded Ernie Riles to the San Francisco Giants for Jeffrey Leonard.
- June 9, 1988
The Texas Rangers signed Steve Kemp as a free agent.
- June 10, 1988
The Atlanta Braves signed Jim Morrison as a free agent.
The Cincinnati Reds signed Mike Anderson as an amateur free agent.
- June 13, 1988
The Baltimore Orioles released Mark Leiter.
The Texas Rangers released José Tolentino.
- June 16, 1988
The Philadelphia Phillies released Bill Almon.
- June 17, 1988
The Houston Astros signed José Tolentino as a free agent.
- June 18, 1988
The Los Angeles Dodgers signed Pedro Martinez as an amateur free agent.
- June 19, 1988
The Cincinnati Reds traded Buddy Bell to the Houston Astros for a player to be named later. The Houston Astros sent Carl Grovom (minors) (October 20, 1988) to the Cincinnati Reds to complete the trade.
- June 20, 1988
The Pittsburgh Pirates signed Scott Bullett as an amateur free agent.
The New York Yankees purchased Kevin Mmahat from the Texas Rangers.
The Cincinnati Reds released Mario Soto.
- June 22, 1988
The Detroit Tigers signed Iván de Jesús as a free agent.
The Cleveland Indians released Dan Schatzeder.
- June 24, 1988
The San Francisco Giants signed Steve Reed as an amateur free agent.
- June 25, 1988
The Philadelphia Phillies signed Bill Scherrer as a free agent.
- June 26, 1988
The Atlanta Braves purchased Germán Jiménez from Jalisco (Mexican).
- June 27, 1988
The Minnesota Twins signed Dan Schatzeder as a free agent.
The Los Angeles Dodgers signed Mario Soto as a free agent.
The Cincinnati Reds signed Bobby Ayala as an amateur free agent.
- June 29, 1988
The Los Angeles Dodgers signed Dámaso García as a free agent.
- July, 1988
The Los Angeles Dodgers released Dámaso García.
- July 1, 1988
The Pittsburgh Pirates signed Will Pennyfeather as an amateur free agent.
- July 2, 1988
The Montreal Expos released Bob McClure.
- July 3, 1988
The Kansas City Royals released Mike Butcher.
- July 4, 1988
The Kansas City Royals released Gene Garber.
The Kansas City Royals released Dan Quisenberry.
- July 5, 1988
The San Francisco Giants signed Lary Sorensen as a free agent.
- July 8, 1988
The California Angels signed Mike Butcher as a free agent.
- July 9, 1988
The Texas Rangers released Larry Parrish.
- July 11, 1988
The Cincinnati Reds signed Max Venable as a free agent.
The New York Mets traded Gene Walter to the Seattle Mariners for Ed Núñez.
- July 13, 1988
The New York Mets signed Bob McClure as a free agent.
The Cincinnati Reds traded Tracy Jones and Pat Pacillo to the Montreal Expos for Jeff Reed, Randy St. Claire and Herm Winningham.
- July 14, 1988
The St. Louis Cardinals signed Dan Quisenberry as a free agent.
The California Angels purchased Mike Brown from the Detroit Tigers.
The Montreal Expos released Dave Engle.
The Chicago Cubs traded Dave Martinez to the Montreal Expos for Mitch Webster.
- July 15, 1988
The Philadelphia Phillies signed Jackie Gutiérrez as a free agent.
The Chicago Cubs released Jim Sundberg.
The San Francisco Giants released Mark Wasinger.
The New York Yankees traded Amalio Carreño to the Philadelphia Phillies for Luis Aguayo.
- July 16, 1988
The Boston Red Sox signed Larry Parrish as a free agent.
- July 17, 1988
The Cleveland Indians signed Mark Wasinger as a free agent.
- July 20, 1988
The Minnesota Twins signed Mike Misuraca as an amateur free agent.
- July 21, 1988
The Texas Rangers signed Jim Sundberg as a free agent.
The New York Yankees traded a player to be named later, Rick Balabon (minors) and Jay Buhner to the Seattle Mariners for Ken Phelps. The New York Yankees sent Troy Evers (minors) (October 12, 1988) to the Seattle Mariners to complete the trade.
- July 22, 1988
The New York Yankees released José Cruz.
The Pittsburgh Pirates traded Darnell Coles to the Seattle Mariners for Glenn Wilson.
- July 23, 1988
The Houston Astros traded Mark Bailey to the Montreal Expos for Casey Candaele.
- July 26, 1988
The Atlanta Braves released Gary Roenicke.
- July 27, 1988
The Texas Rangers signed Iván Rodríguez as an amateur free agent.
- July 28, 1988
The Philadelphia Phillies purchased Salomé Barojas from Mexico City Reds (Mexican).
The Atlanta Braves released Ken Griffey.
The Chicago Cubs traded Paul Noce to the Montreal Expos for Bryan Oelkers.
- July 29, 1988
The Baltimore Orioles traded Mike Boddicker to the Boston Red Sox for Brady Anderson and Curt Schilling.
- July 30, 1988
The Philadelphia Phillies purchased Al Pardo from the New York Mets.
- July 31, 1988
The Cincinnati Reds released Eddie Milner.
- August 1, 1988
The Philadelphia Phillies released Bill Scherrer.
- August 2, 1988
The Cincinnati Reds signed Ken Griffey as a free agent.
- August 4, 1988
The Chicago White Sox traded Vince Harris (minors) and Mike Maksudian to the New York Mets for Tom McCarthy and Steve Springer.
- August 5, 1988
The Cincinnati Reds signed Eddie Milner as a free agent.
The Cleveland Indians released Domingo Ramos.
- August 8, 1988
The Chicago Cubs signed Bill Scherrer as a free agent.
- August 10, 1988
The Los Angeles Dodgers released Don Sutton.
- August 11, 1988
The San Francisco Giants released Harry Spilman.
- August 13, 1988
The Chicago White Sox traded Dave LaPoint to the Pittsburgh Pirates for Barry Jones.
- August 14, 1988
The Cleveland Indians released Chris Bando.
The New York Yankees released Tim Stoddard.
- August 16, 1988
The Baltimore Orioles traded Kevin Price (minors) and D.L. Smith (minors) to the Milwaukee Brewers for Tim Pyznarski.
The Minnesota Twins traded Karl Best to the San Francisco Giants for Alan Cockrell.
The Los Angeles Dodgers traded Pedro Guerrero to the St. Louis Cardinals for John Tudor.
- August 17, 1988
The California Angels signed Domingo Ramos as a free agent.
The Houston Astros signed Harry Spilman as a free agent.
- August 18, 1988
The Philadelphia Phillies signed Bob Wells as an amateur free agent.
- August 19, 1988
The Chicago White Sox traded Gary Redus to the Pittsburgh Pirates for Mike Diaz.
- August 21, 1988
The Cleveland Indians released Bill Laskey.
- August 22, 1988
The New York Mets signed Héctor Ramírez as an amateur free agent.
- August 24, 1988
The Milwaukee Brewers traded Alex Madrid to the Philadelphia Phillies for Mike Young.
- August 26, 1988
The California Angels released Donnie Moore.
- August 28, 1988
The Detroit Tigers signed Shawn Hare as an amateur free agent.
The Pittsburgh Pirates released Dave Hostetler.
The Atlanta Braves traded Ken Oberkfell and cash to the Pittsburgh Pirates for a player to be named later. The Pittsburgh Pirates sent Tommy Gregg (September 1, 1988) to the Atlanta Braves to complete the trade.
- August 29, 1988
The Baltimore Orioles traded Jim Dwyer to the Minnesota Twins for a player to be named later. The Minnesota Twins sent Doug Kline (minors) (August 31, 1988) to the Baltimore Orioles to complete the trade.
- August 30, 1988
The New York Yankees traded Cecilio Guante to the Texas Rangers for Dale Mohorcic.
The Chicago White Sox traded Ricky Horton to the Los Angeles Dodgers for Shawn Hillegas.
- August 31, 1988
The Boston Red Sox returned John Trautwein (earlier draft pick) to the Montreal Expos.
The Chicago White Sox signed Jerry Hairston as a free agent.
The Baltimore Orioles traded Fred Lynn to the Detroit Tigers for players to be named later and Chris Hoiles. The Detroit Tigers sent Cesar Mejia (minors) (September 9, 1988) and Robinson Garces (minors) (September 9, 1988) to the Baltimore Orioles to complete the trade.
The Detroit Tigers traded Mark Lee and Rey Palacios to the Kansas City Royals for Ted Power.
The Boston Red Sox traded Víctor Rosario to the Montreal Expos for John Trautwein.
The Houston Astros traded Denny Walling to the St. Louis Cardinals for Bob Forsch.
- September 1, 1988
The Texas Rangers traded Tom O'Malley to the Montreal Expos for a player to be named later. The Montreal Expos sent Jack Daugherty (September 13, 1988) to the Texas Rangers to complete the trade.
The Montreal Expos traded Bob Sebra to the Philadelphia Phillies for Travis Chambers (minors).
- September 2, 1988
The Detroit Tigers signed Chris Bando as a free agent.
- September 4, 1988
The Philadelphia Phillies signed Joe Millette as an amateur free agent.
- September 6, 1988
The Cleveland Indians released Chris Codiroli.
- September 25, 1988
The Chicago White Sox signed Jim Morris as a free agent.
- September 29, 1988
The New York Yankees signed Mark Leiter as a free agent.
The Philadelphia Phillies released Salomé Barojas.
The Atlanta Braves traded Kevin Blankenship and Kevin Coffman to the Chicago Cubs for Jody Davis.
- October 3, 1988
The Baltimore Orioles released Don Aase.
The Houston Astros released Steve Henderson.
The Baltimore Orioles released Doug Sisk.
The California Angels traded David Holdridge to the Philadelphia Phillies for Lance Parrish.
The Los Angeles Dodgers traded Bill Krueger to the Pittsburgh Pirates for Jim Neidlinger.
- October 4, 1988
The St. Louis Cardinals released Lee Tunnell.
- October 6, 1988
The California Angels released Butch Wynegar.
- October 7, 1988
The Detroit Tigers released Chris Bando.
The Cincinnati Reds released Dave Concepción.
The Philadelphia Phillies released Bill Dawley.
The Philadelphia Phillies released Jackie Gutiérrez.
- October 9, 1988
The Toronto Blue Jays signed Carlos Delgado as an amateur free agent.
- October 11, 1988
The Texas Rangers released Guy Hoffman.
- October 13, 1988
The Milwaukee Brewers released Mark Clear.
The Philadelphia Phillies released David Palmer.
The Pittsburgh Pirates released Dave Rucker.
- October 15, 1988
Rick Anderson of the Kansas City Royals granted free agency.
Jay Baller of the Seattle Mariners granted free agency.
Skeeter Barnes of the Cincinnati Reds granted free agency.
Bill Bathe of the Chicago Cubs granted free agency.
Billy Beane of the Detroit Tigers granted free agency.
Dann Bilardello of the Kansas City Royals granted free agency.
Randy Bockus of the San Francisco Giants granted free agency.
Jeff Calhoun of the Philadelphia Phillies granted free agency.
Ernie Camacho of the Houston Astros granted free agency.
Nick Capra of the Kansas City Royals granted free agency.
Stan Clarke of the Detroit Tigers granted free agency.
Steve Crawford of the Los Angeles Dodgers granted free agency.
Pete Dalena of the New York Yankees granted free agency.
Jeff Datz of the Houston Astros granted free agency.
Butch Davis of the Baltimore Orioles granted free agency.
Steve Davis of the Toronto Blue Jays granted free agency.
Luis DeLeón of the Houston Astros granted free agency.
Pat Dodson of the Boston Red Sox granted free agency.
Juan Eichelberger of the Atlanta Braves granted free agency.
Pete Filson of the New York Yankees granted free agency.
Steve Fireovid of the Kansas City Royals granted free agency.
Dan Firova of the Cleveland Indians granted free agency.
Tony Fossas of the Texas Rangers granted free agency.
Leo García of the Cincinnati Reds granted free agency.
Brian Giles of the Seattle Mariners granted free agency.
Mike Griffin of the Baltimore Orioles granted free agency.
Don Heinkel of the Detroit Tigers granted free agency.
Manny Hernández of the Houston Astros granted free agency.
Tim Hulett of the Montreal Expos granted free agency.
Dave Johnson of the Pittsburgh Pirates granted free agency.
Ed Jurak of the Oakland Athletics granted free agency.
Pat Keedy of the Houston Astros granted free agency.
Steve Kiefer of the Milwaukee Brewers granted free agency.
Brad Komminsk of the Milwaukee Brewers granted free agency.
Ray Krawczyk of the California Angels granted free agency.
Bill Landrum of the Chicago Cubs granted free agency.
Tito Landrum of the Texas Rangers granted free agency.
Dwight Lowry of the Minnesota Twins granted free agency.
Scotti Madison of the Kansas City Royals granted free agency.
Roger Mason of the San Francisco Giants granted free agency.
Orlando Mercado of the Oakland Athletics granted free agency.
Junior Noboa of the California Angels granted free agency.
Paul Noce of the Montreal Expos granted free agency.
Randy O'Neal of the St. Louis Cardinals granted free agency.
Greg Olson of the New York Mets granted free agency.
Dave Owen of the Kansas City Royals granted free agency.
Sap Randall of the Chicago White Sox granted free agency.
Joe Redfield of the California Angels granted free agency.
Billy Jo Robidoux of the Milwaukee Brewers granted free agency.
Rick Rodriguez of the Cleveland Indians granted free agency.
Ron Roenicke of the Cincinnati Reds granted free agency.
Mark Ryal of the St. Louis Cardinals granted free agency.
Bill Scherrer of the Chicago Cubs granted free agency.
Don Schulze of the Detroit Tigers granted free agency.
Dick Scott of the New York Yankees granted free agency.
Larry See of the Texas Rangers granted free agency.
Danny Sheaffer of the Boston Red Sox granted free agency.
Brick Smith of the Seattle Mariners granted free agency.
James Steels of the Texas Rangers granted free agency.
Bob Tewksbury of the Chicago Cubs granted free agency.
Lou Thornton of the Toronto Blue Jays granted free agency.
Rusty Tillman of the San Francisco Giants granted free agency.
DeWayne Vaughn of the Texas Rangers granted free agency.
Max Venable of the Cincinnati Reds granted free agency.
Chico Walker of the California Angels granted free agency.
Duane Walker of the St. Louis Cardinals granted free agency.
Dave Walsh of the Toronto Blue Jays granted free agency.
Mark Wasinger of the Cleveland Indians granted free agency.
Jim Weaver of the Houston Astros granted free agency.
Mickey Weston of the New York Mets granted free agency.
Paul Wilmet of the Pittsburgh Pirates granted free agency.
Mike Woodard of the Chicago White Sox granted free agency.
- October 19, 1988
The Chicago White Sox released Jerry Hairston.
- October 22, 1988
Jeff Schwarz of the Chicago Cubs granted free agency.
Donnie Scott of the Milwaukee Brewers granted free agency.
Billy Taylor of the Texas Rangers granted free agency.
- October 24, 1988
Doyle Alexander of the Detroit Tigers granted free agency.
Bob Boone of the California Angels granted free agency.
Jim Clancy of the Toronto Blue Jays granted free agency.
Willie Randolph of the New York Yankees granted free agency.
Claudell Washington of the New York Yankees granted free agency.
The New York Yankees traded Jack Clark and Pat Clements to the San Diego Padres for Stan Jefferson, Jimmy Jones and Lance McCullers.
The Minnesota Twins traded Eric Bullock, Tom Herr and Tom Nieto to the Philadelphia Phillies for Shane Rawley and cash.
- October 26, 1988
The Milwaukee Brewers released Steve Stanicek.
- October 27, 1988
The New York Mets released Bob McClure.
- October 28, 1988
The Boston Red Sox released Larry Parrish.
The Toronto Blue Jays released Frank Wills.
The Detroit Tigers traded Walt Terrell to the San Diego Padres for Chris Brown and Keith Moreland.
- October 29, 1988
The Kansas City Royals signed Steve Fireovid as a free agent.
- October 30, 1988
The Chicago White Sox signed Billy Jo Robidoux as a free agent.
- October 31, 1988
The Toronto Blue Jays released Doug Bair.
- November 3, 1988
The San Francisco Giants signed Ed Jurak as a free agent.
The California Angels traded Rob Wassenaar (minors), Mike Cook and Paul Sorrento to the Minnesota Twins for Kevin Trudeau (minors) and Bert Blyleven.
- November 4, 1988
Jim Acker of the Atlanta Braves granted free agency.
Luis Aguayo of the New York Yankees granted free agency.
Neil Allen of the New York Yankees granted free agency.
Joaquín Andújar of the Houston Astros granted free agency.
Don Baylor of the Oakland Athletics granted free agency.
Dave Bergman of the Detroit Tigers granted free agency.
Bud Black of the Cleveland Indians granted free agency.
Thad Bosley of the California Angels granted free agency.
Bill Buckner of the Kansas City Royals granted free agency.
Randy Bush of the Minnesota Twins granted free agency.
Dave Collins of the Cincinnati Reds granted free agency.
Ron Davis of the San Francisco Giants granted free agency.
Frank DiPino of the Chicago Cubs granted free agency.
Jim Dwyer of the Minnesota Twins granted free agency.
Darrell Evans of the Detroit Tigers granted free agency.
Mike Flanagan of the Toronto Blue Jays granted free agency.
Scott Fletcher of the Texas Rangers granted free agency.
Bob Forsch of the Houston Astros granted free agency.
Terry Francona of the Cleveland Indians granted free agency.
Jim Gantner of the Milwaukee Brewers granted free agency.
Phil Garner of the San Francisco Giants granted free agency.
Alfredo Griffin of the Los Angeles Dodgers granted free agency.
Greg Gross of the Philadelphia Phillies granted free agency.
Cecilio Guante of the Texas Rangers granted free agency.
Greg Harris of the Philadelphia Phillies granted free agency.
Andy Hawkins of the San Diego Padres granted free agency.
Dave Henderson of the Oakland Athletics granted free agency.
George Hendrick of the California Angels granted free agency.
Tom Herr of the Philadelphia Phillies granted free agency.
Rick Honeycutt of the Oakland Athletics granted free agency.
Bruce Hurst of the Boston Red Sox granted free agency.
Odell Jones of the Milwaukee Brewers granted free agency.
Ron Kittle of the Cleveland Indians granted free agency.
Dennis Lamp of the Boston Red Sox granted free agency.
Dave LaPoint of the Pittsburgh Pirates granted free agency.
Tim Laudner of the Minnesota Twins granted free agency.
Charlie Lea of the Minnesota Twins granted free agency.
Rick Leach of the Toronto Blue Jays granted free agency.
Jeffrey Leonard of the Milwaukee Brewers granted free agency.
Rick Mahler of the Atlanta Braves granted free agency.
Mike Marshall of the Los Angeles Dodgers granted free agency.
Larry McWilliams of the St. Louis Cardinals granted free agency.
Mike Moore of the Seattle Mariners granted free agency.
Jim Morrison of the Atlanta Braves granted free agency.
Graig Nettles of the Montreal Expos granted free agency.
Tom Niedenfuer of the Baltimore Orioles granted free agency.
Ron Oester of the Cincinnati Reds granted free agency.
Jesse Orosco of the Los Angeles Dodgers granted free agency.
Alejandro Peña of the Los Angeles Dodgers granted free agency.
Ted Power of the Detroit Tigers granted free agency.
Jamie Quirk of the Kansas City Royals granted free agency.
Domingo Ramos of the California Angels granted free agency.
Gary Redus of the Pittsburgh Pirates granted free agency.
Craig Reynolds of the Houston Astros granted free agency.
Jerry Royster of the Atlanta Braves granted free agency.
Nolan Ryan of the Houston Astros granted free agency.
Scott Sanderson of the Chicago Cubs granted free agency.
Steve Sax of the Los Angeles Dodgers granted free agency.
Dan Schatzeder of the Minnesota Twins granted free agency.
Mike Schmidt of the Philadelphia Phillies granted free agency.
Mike Smithson of the Boston Red Sox granted free agency.
Lary Sorensen of the San Francisco Giants granted free agency.
Mario Soto of the Los Angeles Dodgers granted free agency.
Harry Spilman of the Houston Astros granted free agency.
Jim Sundberg of the Texas Rangers granted free agency.
Garry Templeton of the San Diego Padres granted free agency.
Wayne Tolleson of the New York Yankees granted free agency.
Alex Treviño of the Houston Astros granted free agency.
Manny Trillo of the Chicago Cubs granted free agency.
Willie Upshaw of the Cleveland Indians granted free agency.
Ed Vande Berg of the Texas Rangers granted free agency.
Ozzie Virgil of the Atlanta Braves granted free agency.
Bob Walk of the Pittsburgh Pirates granted free agency.
Ron Washington of the Cleveland Indians granted free agency.
Joel Youngblood of the San Francisco Giants granted free agency.
The Detroit Tigers released Larry Herndon.
- November 5, 1988
The Cincinnati Reds signed Skeeter Barnes as a free agent.
- November 7, 1988
The Los Angeles Dodgers signed Alfredo Griffin as a free agent.
The Los Angeles Dodgers signed Alejandro Peña as a free agent.
- November 8, 1988
The San Francisco Giants signed Bill Bathe as a free agent.
The Chicago White Sox signed Rick Rodriguez as a free agent.
The Cincinnati Reds released Leon Durham.
The St. Louis Cardinals released Mike Laga.
The Chicago White Sox released Kelly Paris.
- November 9, 1988
The Baltimore Orioles traded Pete Blohm (minors) to the Pittsburgh Pirates for Randy Milligan.
- November 10, 1988
The Texas Rangers signed Paul Wilmet as a free agent.
The New York Yankees released Tommy John.
The Chicago Cubs released Jerry Mumphrey.
- November 11, 1988
The Philadelphia Phillies signed Mark Ryal as a free agent.
The Oakland Athletics signed Kevin Ward as a free agent.
- November 13, 1988
The Los Angeles Dodgers signed Mike Marshall as a free agent.
- November 14, 1988
The Detroit Tigers signed Jeff Datz as a free agent.
The Baltimore Orioles released Wade Rowdon.
The Montreal Expos traded Mike Smith to the Baltimore Orioles for a player to be named later. The Baltimore Orioles sent Doug Kline (minors) (December 7, 1988) to the Montreal Expos to complete the trade.
- November 15, 1988
The Seattle Mariners signed Luis DeLeón as a free agent.
The Pittsburgh Pirates signed Gary Redus as a free agent.
The Cleveland Indians signed Danny Sheaffer as a free agent.
The Baltimore Orioles traded Jerry Holtz (minors) and Tom Magrann to the Cleveland Indians for John Githens (minors) and Don Lovell (minors).
- November 16, 1988
The Cleveland Indians signed Pat Keedy as a free agent.
The Cleveland Indians signed Mark Wasinger as a free agent.
The Detroit Tigers released Ray Knight.
- November 17, 1988
The Philadelphia Phillies signed Tom Herr as a free agent.
The Philadelphia Phillies signed Joe Redfield as a free agent.
The New York Yankees signed Don Schulze as a free agent.
The Baltimore Orioles released Dickie Noles.
The Houston Astros released Jim Pankovits.
The Houston Astros released Craig Smajstrla.
The California Angels traded Brian Dorsett to the New York Yankees for Eric Schmidt (minors).
- November 20, 1988
The Kansas City Royals signed Stan Clarke as a free agent.
The Boston Red Sox signed Dennis Lamp as a free agent.
The Pittsburgh Pirates released Al Pedrique.
The Chicago White Sox released José Segura.
The New York Mets traded Reggie Dobie (minors) to the Seattle Mariners for Chuck Carr.
The Montreal Expos traded Wilfredo Tejada to the San Francisco Giants for Ángel Escobar.
- November 21, 1988
The Baltimore Orioles signed Butch Davis as a free agent.
The Baltimore Orioles signed Tim Hulett as a free agent.
The Cleveland Indians signed Brad Komminsk as a free agent.
The Los Angeles Dodgers signed Roberto Mejía as an amateur free agent.
The Oakland Athletics released Matt Young.
- November 22, 1988
The Cleveland Indians signed Pete Dalena as a free agent.
- November 23, 1988
The Minnesota Twins signed Manny Hernández as a free agent.
The New York Yankees signed Steve Sax as a free agent.
The Baltimore Orioles signed Jeff Schwarz as a free agent.
- November 26, 1988
The New York Yankees signed Steve Kiefer as a free agent.
The Chicago White Sox signed Ron Kittle as a free agent.
- November 27, 1988
The Pittsburgh Pirates signed Bob Walk as a free agent.
- November 28, 1988
The Oakland Athletics signed Mike Moore as a free agent.
The Baltimore Orioles signed Mickey Weston as a free agent.
The Cleveland Indians released Rod Allen.
The Pittsburgh Pirates traded a player to be named later and Denny González to the Cleveland Indians for a player to be named later. The Pittsburgh Pirates sent Félix Fermín (March 25, 1989) to the Cleveland Indians to complete the trade. The Cleveland Indians sent Jay Bell (March 25, 1989) to the Pittsburgh Pirates to complete the trade.
- November 30, 1988
The Oakland Athletics signed Billy Beane as a free agent.
The Detroit Tigers signed Randy Bockus as a free agent.
The Kansas City Royals signed Bob Boone as a free agent.
The Texas Rangers signed Scott Fletcher as a free agent.
The Minnesota Twins signed Greg Olson as a free agent.
- December 1, 1988
The Oakland Athletics signed Dave Henderson as a free agent.
- December 2, 1988
The Cleveland Indians signed Luis Aguayo as a free agent.
The Cincinnati Reds signed Rick Mahler as a free agent.
The Philadelphia Phillies signed Randy O'Neal as a free agent.
The Cincinnati Reds signed Ron Oester as a free agent.
- December 3, 1988
The New York Yankees signed Dave LaPoint as a free agent.
The Cleveland Indians signed Jesse Orosco as a free agent.
- December 4, 1988
The Detroit Tigers signed Larry See as a free agent.
The Atlanta Braves released Chuck Cary.
The Atlanta Braves released Ed Olwine.
The Baltimore Orioles traded Eddie Murray to the Los Angeles Dodgers for Juan Bell, Brian Holton and Ken Howell.
The Minnesota Twins traded Mark Portugal to the Houston Astros for a player to be named later. The Houston Astros sent Todd McClure (minors) (December 7, 1988) to the Minnesota Twins to complete the trade.
- December 5, 1988
The Texas Rangers drafted Darrel Akerfelds from the Cleveland Indians in the 1988 rule 5 draft.
The Chicago White Sox drafted Rich Amaral from the Chicago Cubs in the 1988 rule 5 draft.
The Atlanta Braves drafted Gerónimo Berroa from the Toronto Blue Jays in the 1988 rule 5 draft.
The California Angels drafted Marcus Lawton from the New York Mets in the 1988 rule 5 draft.
The Oakland Athletics drafted José Mota from the Los Angeles Dodgers in the 1988 rule 5 draft.
The Baltimore Orioles drafted Mike Smith from the Cincinnati Reds in the 1988 rule 5 draft.
The Houston Astros drafted Dave Stapleton from the Milwaukee Brewers in the 1988 rule 5 draft.
The Atlanta Braves drafted Matt Stark from the Toronto Blue Jays in the 1988 rule 5 draft.
The Philadelphia Phillies drafted Jeff Tabaka from the Montreal Expos in the 1988 rule 5 draft.
The Cleveland Indians drafted Efrain Valdez from the Texas Rangers in the 1988 rule 5 draft.
The Minnesota Twins drafted Gary Wayne from the Montreal Expos in the 1988 rule 5 draft.
The Chicago Cubs drafted Eric Yelding from the Toronto Blue Jays in the 1988 rule 5 draft.
The Cleveland Indians signed Bud Black as a free agent.
The Detroit Tigers signed Al Pedrique as a free agent.
The Baltimore Orioles released Jeff Stone.
The New York Yankees traded Bob Meacham to the Texas Rangers for Bob Brower.
The Chicago Cubs traded Drew Hall, Jamie Moyer and Rafael Palmeiro to the Texas Rangers for Luis Benitez (minors), Pablo Delgado (minors), Paul Kilgus, Curt Wilkerson, Mitch Williams and Steve Wilson.
- December 6, 1988
The Toronto Blue Jays drafted Tom Gilles from the Minnesota Twins in the 1988 minor league draft.
The Toronto Blue Jays drafted Mauro Gozzo from the Kansas City Royals in the 1988 minor league draft.
The Seattle Mariners drafted José Meléndez from the Pittsburgh Pirates in the 1988 minor league draft.
The Chicago Cubs drafted Erik Pappas from the California Angels in the 1988 minor league draft.
The Kansas City Royals drafted Keith Shepherd from the Pittsburgh Pirates in the 1988 minor league draft.
The California Angels drafted Carl Willis from the Chicago White Sox in the 1988 minor league draft.
The Kansas City Royals signed Bill Buckner as a free agent.
The Minnesota Twins signed Jim Dwyer as a free agent.
The San Diego Padres signed Garry Templeton as a free agent.
The Cleveland Indians traded Julio Franco to the Texas Rangers for Jerry Browne, Oddibe McDowell and Pete O'Brien.
The Montreal Expos traded Jeff Parrett and Floyd Youmans to the Philadelphia Phillies for Kevin Gross.
- December 7, 1988
The Montreal Expos signed Jay Baller as a free agent.
The Detroit Tigers signed Dave Bergman as a free agent.
The Cincinnati Reds signed Dave Collins as a free agent.
The Philadelphia Phillies signed Greg Harris as a free agent.
The Milwaukee Brewers signed Odell Jones as a free agent.
The Seattle Mariners signed Jeffrey Leonard as a free agent.
The Seattle Mariners signed Tom Niedenfuer as a free agent.
The Detroit Tigers signed Ted Power as a free agent.
The Texas Rangers signed Nolan Ryan as a free agent.
The Chicago Cubs signed Scott Sanderson as a free agent.
The Philadelphia Phillies signed Mike Schmidt as a free agent.
The San Francisco Giants signed Lary Sorensen as a free agent.
The Los Angeles Dodgers signed Mario Soto as a free agent.
The Philadelphia Phillies released Kent Tekulve.
The Minnesota Twins traded Jeff Bumgarner (minors), Steve Gasser (minors) and Toby Nivens (minors) to the New York Mets for Mike Santiago (minors) and Wally Backman.
The California Angels traded Gus Polidor to the Milwaukee Brewers for Bill Schroeder.
- December 8, 1988
The New York Yankees signed Andy Hawkins as a free agent.
The San Diego Padres signed Bruce Hurst as a free agent.
The Baltimore Orioles traded Gordon Dillard and Ken Howell to the Philadelphia Phillies for Phil Bradley.
The Montreal Expos traded Tracy Jones to the San Francisco Giants for Mike Aldrete.
The Boston Red Sox traded Dan Gakeler and Spike Owen to the Montreal Expos for John Dopson and Luis Rivera.
The Chicago Cubs traded Rolando Roomes to the Cincinnati Reds for Lloyd McClendon.
- December 9, 1988
The Chicago White Sox signed Jim Weaver as a free agent.
- December 10, 1988
The Los Angeles Dodgers signed Willie Randolph as a free agent.
- December 11, 1988
The New York Mets signed José Martínez as an amateur free agent.
- December 12, 1988
The Minnesota Twins signed Randy Bush as a free agent.
The Chicago White Sox released Mike Diaz.
- December 13, 1988
The Boston Red Sox traded a player to be named later, Todd Benzinger and Jeff Sellers to the Cincinnati Reds for Nick Esasky and Rob Murphy. The Boston Red Sox sent Luis Vasquez (minors) (January 12, 1989) to the Cincinnati Reds to complete the trade.
The Houston Astros traded Dan Walters to the San Diego Padres for Ed Vosberg.
- December 14, 1988
The Chicago Cubs signed Domingo Ramos as a free agent.
The Houston Astros signed Craig Smajstrla as a free agent.
- December 15, 1988
The Oakland Athletics signed Dick Scott as a free agent.
The New York Yankees signed Mark Hutton as an amateur free agent.
The Boston Red Sox released Glenn Hoffman.
- December 16, 1988
The Houston Astros signed Jim Clancy as a free agent.
The Cincinnati Reds signed Mike Griffin as a free agent.
The Houston Astros signed Craig Reynolds as a free agent.
The St. Louis Cardinals signed Bob Tewksbury as a free agent.
The Philadelphia Phillies traded Milt Thompson to the St. Louis Cardinals for Curt Ford and Steve Lake.
- December 18, 1988
The New York Yankees signed Wayne Tolleson as a free agent.
- December 19, 1988
The Minnesota Twins signed Tim Laudner as a free agent.
The Boston Red Sox signed Mike Smithson as a free agent.
The Montreal Expos traded Mike Berger (minors) to the Texas Rangers for Scott Anderson.
- December 20, 1988
The Milwaukee Brewers signed Jim Gantner as a free agent.
The New York Yankees signed Jamie Quirk as a free agent.
Ron Guidry of the New York Yankees granted free agency.
The Cleveland Indians released Jon Perlman.
The Cleveland Indians released Reggie Williams.
- December 21, 1988
The St. Louis Cardinals signed Frank DiPino as a free agent.
The Houston Astros signed Bob Forsch as a free agent.
The Oakland Athletics signed Rick Honeycutt as a free agent.
The Milwaukee Brewers signed Ray Krawczyk as a free agent.
The Houston Astros signed Alex Treviño as a free agent.
The Cincinnati Reds signed Manny Trillo as a free agent.
The Texas Rangers signed Ed Vande Berg as a free agent.
The Cincinnati Reds signed Joel Youngblood as a free agent.
The Houston Astros released Buddy Bell.
The San Francisco Giants released Bob Brenly.
The Minnesota Twins released John Christensen.
The Cincinnati Reds released Ken Griffey.
The Los Angeles Dodgers released Danny Heep.
The St. Louis Cardinals released Bob Horner.
The St. Louis Cardinals released Tom Lawless.
The Oakland Athletics released Steve Ontiveros.
The Seattle Mariners released Rod Scurry.
The Cincinnati Reds released Frank Williams.
- December 22, 1988
The Houston Astros signed Dave Johnson as a free agent.
The New York Yankees signed Dickie Noles as a free agent.
The Chicago White Sox signed José Segura as a free agent.
Hanshin Tigers (Japan Central) purchased Cecil Fielder from the Toronto Blue Jays.
- December 23, 1988
The Atlanta Braves signed Darrell Evans as a free agent.
- December 24, 1988
The Toronto Blue Jays signed Mike Flanagan as a free agent.
- December 26, 1988
The Cleveland Indians signed Steve Davis as a free agent.
- December 30, 1988
The Minnesota Twins signed Orlando Mercado as a free agent.
- Before 1989 Season
Jim Adduci sent from the Milwaukee Brewers to the Philadelphia Phillies in an unknown transaction.
Darryl Motley sent from the California Angels to ??? in an unknown transaction.
Ron Shepherd sent from the Montreal Expos to the St. Louis Cardinals in an unknown transaction.
Dwight Taylor sent from the Montreal Expos to the Cleveland Indians in an unknown transaction.
- January, 1989
The Oakland Athletics signed Bill Dawley as a free agent.
The San Francisco Giants signed George Wright as a free agent.
- January 1, 1989
Tack Wilson sent from the California Angels to the Texas Rangers in an unknown transaction. (Date given is approximate. Exact date is uncertain.)
- January 4, 1989
The California Angels signed Glenn Hoffman as a free agent.
The Cincinnati Reds signed Scotti Madison as a free agent.
The Montreal Expos signed Junior Noboa as a free agent.
- January 5, 1989
The Montreal Expos signed Darryl Motley as a free agent.
- January 6, 1989
The Atlanta Braves signed Jim Acker as a free agent.
The Texas Rangers signed Cecilio Guante as a free agent.
The Texas Rangers signed Jim Sundberg as a free agent.
- January 9, 1989
The Texas Rangers signed Buddy Bell as a free agent.
- January 10, 1989
The Houston Astros traded Pedro DeLeon (minors), Mike Hook (minors) and John Fishel to the New York Yankees for Rick Rhoden.
- January 11, 1989
The Philadelphia Phillies signed Steve Stanicek as a free agent.
The California Angels signed Max Venable as a free agent.
- January 12, 1989
The Kansas City Royals signed Nick Capra as a free agent.
The Pittsburgh Pirates signed Bill Landrum as a free agent.
The California Angels signed Bob McClure as a free agent.
The Toronto Blue Jays signed Frank Wills as a free agent.
- January 13, 1989
The Detroit Tigers signed Doyle Alexander as a free agent.
The Oakland Athletics signed Chris Bando as a free agent.
The Chicago White Sox released Dwayne Hosey.
The New York Mets traded Rich Rodriguez to the San Diego Padres for Brad Pounders (minors) and Bill Stevenson (minors).
- January 16, 1989
The Detroit Tigers signed Frank Williams as a free agent.
- January 17, 1989
The Cleveland Indians signed Neil Allen as a free agent.
The San Francisco Giants signed James Steels as a free agent.
The California Angels signed Claudell Washington as a free agent.
The Montreal Expos signed Matt Stairs as an amateur free agent.
- January 18, 1989
The Toronto Blue Jays signed Bob Brenly as a free agent.
The Cleveland Indians signed Tim Stoddard as a free agent.
- January 19, 1989
The Montreal Expos signed Dámaso García as a free agent.
The St. Louis Cardinals signed Don Heinkel as a free agent.
The Oakland Athletics signed Matt Young as a free agent.
- January 21, 1989
The Milwaukee Brewers signed Tony Fossas as a free agent.
- January 22, 1989
The California Angels signed Robinson Checo as an amateur free agent.
- January 23, 1989
The Toronto Blue Jays signed Tom Lawless as a free agent.
The Texas Rangers signed Rick Leach as a free agent.
The Milwaukee Brewers signed Donnie Scott as a free agent.
The Chicago White Sox traded Joel Davis and Ed Wojna to the Cleveland Indians for Eddie Williams.
- January 24, 1989
The Baltimore Orioles traded Terry Kennedy to the San Francisco Giants for Bob Melvin.
- January 25, 1989
The Pittsburgh Pirates signed Dann Bilardello as a free agent.
The San Francisco Giants signed Mike Laga as a free agent.
- January 26, 1989
The New York Yankees signed Chuck Cary as a free agent.
- January 27, 1989
The Los Angeles Dodgers signed Dave Walsh as a free agent.
The Philadelphia Phillies purchased Dickie Thon from the San Diego Padres.
- January 28, 1989
The California Angels signed Mark Clear as a free agent.
The Toronto Blue Jays signed Chico Walker as a free agent.
- January 30, 1989
The Philadelphia Phillies signed Larry McWilliams as a free agent.
The Houston Astros signed Dan Schatzeder as a free agent.
- February, 1989
The Milwaukee Brewers signed Lou Thornton as a free agent.
The Chicago White Sox released Dar Smith.
- February 6, 1989
The Boston Red Sox signed Danny Heep as a free agent.
- February 7, 1989
The Houston Astros signed Harry Spilman as a free agent.
The Houston Astros signed Ron Washington as a free agent.
- February 10, 1989
The California Angels signed Chris Beasley as a free agent.
The Chicago White Sox signed Jerry Willard as a free agent.
- February 13, 1989
The New York Yankees signed Tommy John as a free agent.
The Minnesota Twins signed Lee Tunnell as a free agent.
- February 15, 1989
The St. Louis Cardinals signed Leon Durham as a free agent.
The Milwaukee Brewers traded Dan Murphy to the San Diego Padres for Todd Simmons (minors) and Jim Austin.
- February 16, 1989
The Houston Astros signed Roger Mason as a free agent.
The Philadelphia Phillies signed Steve Ontiveros as a free agent.
- February 17, 1989
The Toronto Blue Jays signed Doug Bair as a free agent.
- February 20, 1989
The New York Mets signed Don Aase as a free agent.
- February 21, 1989
The Cleveland Indians signed Brian Giles as a free agent.
- February 22, 1989
The Pittsburgh Pirates signed Jim Pankovits as a free agent.
The Detroit Tigers released Mark Huismann.
- February 23, 1989
The Oakland Athletics signed Dwayne Hosey as a free agent.
- February 25, 1989
The Detroit Tigers signed David Palmer as a free agent.
The Texas Rangers signed Jeff Stone as a free agent.
- February 27, 1989
The San Francisco Giants signed Ernie Camacho as a free agent.
- February 28, 1989
The Minnesota Twins signed Carlos Pulido as an amateur free agent.
- March, 1989
The Kansas City Royals released Rich Thompson.
- March 1, 1989
The Baltimore Orioles signed Mark Huismann as a free agent.
- March 3, 1989
The Philadelphia Phillies released Julio Machado.
- March 7, 1989
The Kansas City Royals signed Steve Crawford as a free agent.
- March 9, 1989
The Chicago White Sox released Donnie Hill.
The California Angels traded DeWayne Buice to the Toronto Blue Jays for Cliff Young.
- March 12, 1989
The Baltimore Orioles traded Mike Morgan to the Los Angeles Dodgers for Mike Devereaux.
- March 15, 1989
The Montreal Expos signed Rich Thompson as a free agent.
- March 17, 1989
The Milwaukee Brewers traded Lou Thornton to the Pittsburgh Pirates for Rubén Rodríguez.
- March 19, 1989
The Cleveland Indians traded Mel Hall to the New York Yankees for Joel Skinner and Turner Ward.
- March 20, 1989
The Minnesota Twins traded Balvino Gálvez to the New York Yankees for Steve Shields.
- March 21, 1989
The Minnesota Twins traded Steve Lombardozzi to the Houston Astros for players to be named later. The Houston Astros sent Ramon Cedeno (minors) (September 16, 1989) and Gordon Farmer (minors) (September 16, 1989) to the Minnesota Twins to complete the trade.
- March 22, 1989
The Oakland Athletics signed Donnie Hill as a free agent.
The Kansas City Royals signed Dar Smith as a free agent.
- March 23, 1989
The Philadelphia Phillies released Ricky Trlicek.
The Detroit Tigers traded Tom Brookens to the New York Yankees for Charles Hudson.
The Detroit Tigers traded Luis Salazar to the San Diego Padres for Mike Brumley.
The Chicago White Sox traded Ken Williams to the Detroit Tigers for Eric King.
- March 25, 1989
The Atlanta Braves purchased John Russell from the Philadelphia Phillies.
The Atlanta Braves purchased Jeff Treadway from the Cincinnati Reds.
The Detroit Tigers released Ted Power.
- March 26, 1989
The Cleveland Indians traded Carmelo Castillo to the Minnesota Twins for Keith Atherton.
The Baltimore Orioles traded Ken Gerhart to the San Francisco Giants for Francisco Meléndez.
- March 27, 1989
The California Angels returned Marcus Lawton (earlier draft pick) to the New York Mets.
The Cleveland Indians released Neil Allen.
The Detroit Tigers released Dwayne Murphy.
The Atlanta Braves released Matt Stark.
The New York Yankees traded Dana Ridenour (minors) to the Seattle Mariners for Steve Balboni.
The Los Angeles Dodgers traded Gil Reyes to the Montreal Expos for Jeff Fischer.
- March 28, 1989
The St. Louis Cardinals signed Ted Power as a free agent.
The Chicago Cubs released Rich Gossage.
The Atlanta Braves released Albert Hall.
The Pittsburgh Pirates released Bill Krueger.
The Chicago Cubs released Al Nipper.
The New York Mets released Ed Núñez.
The Chicago White Sox released Mark Salas.
The Cincinnati Reds released Randy St. Claire.
The Montreal Expos traded Mark Bailey and Tom O'Malley to the New York Mets for Steve Frey.
The Montreal Expos traded Neal Heaton to the Pittsburgh Pirates for Brett Gideon.
The Montreal Expos traded Víctor Rosario to the Philadelphia Phillies for Tim Sossamon (minors).
- March 29, 1989
The Atlanta Braves purchased Mark Eichhorn from the Toronto Blue Jays.
The Cincinnati Reds released Don Wakamatsu.
The Milwaukee Brewers released Mike Young.
The Seattle Mariners released Eric Fox.
The Oakland Athletics signed Eric Fox as a free agent.
- March 30, 1989
The Milwaukee Brewers signed Dave Engle as a free agent.
The Milwaukee Brewers signed Terry Francona as a free agent.
The Cincinnati Reds signed Ken Griffey as a free agent.
The San Diego Padres signed Billy Taylor as a free agent.
The Cincinnati Reds signed Kent Tekulve as a free agent.
The Philadelphia Phillies released Tim Fortugno.
The New York Mets released Mike Maksudian.
The Atlanta Braves released Paul Runge.
The Atlanta Braves traded Dave Miller (minors) and cash to the Texas Rangers for Dwayne Henry.
- March 31, 1989
The California Angels released Urbano Lugo.
The Baltimore Orioles traded Carl Nichols to the Houston Astros for Vic Hithe (minors) and Dave Johnson.
- April 1, 1989
The Cleveland Indians signed Neil Allen as a free agent.
The Detroit Tigers signed Ed Núñez as a free agent.
The Cleveland Indians signed Mark Salas as a free agent.
The Minnesota Twins signed Randy St. Claire as a free agent.
The Chicago White Sox released Pedro Borbón.
The Cleveland Indians traded Chuck Baldwin (minors) to the Seattle Mariners for Dave Hengel.
The transaction information used here was obtained free of charge from and is copyrighted by RetroSheet. We attempt to update transactions throughout the season.
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