Transactions
Transactions listed are from October 1 of previous year to April 1 of the following year.
- November 20, 1988
Traded Reggie Dobie (minors) to the Seattle Mariners. Received Chuck Carr.
- December 5, 1988
Marcus Lawton drafted by the California Angels in the 1988 rule 5 draft.
- December 7, 1988
Traded Mike Santiago (minors) and Wally Backman to the Minnesota Twins. Received Jeff Bumgarner (minors), Steve Gasser (minors) and Toby Nivens (minors).
- December 11, 1988
Signed José Martínez as an amateur free agent.
- January 13, 1989
Traded Rich Rodriguez to the San Diego Padres. Received Brad Pounders (minors) and Bill Stevenson (minors).
- February 20, 1989
Signed Don Aase as a free agent.
- March 27, 1989
The California Angels returned Marcus Lawton (earlier draft pick).
- March 28, 1989
Released Ed Núñez.
Traded Steve Frey to the Montreal Expos. Received Mark Bailey and Tom O'Malley.
- March 30, 1989
Released Mike Maksudian.
- April 5, 1989
Signed Julio Machado as a free agent.
- June 5, 1989
Drafted Alan Zinter in the 1st round (24th pick) of the 1989 amateur draft. Player signed June 20, 1989.
Drafted Brook Fordyce in the 3rd round of the 1989 amateur draft. Player signed June 6, 1989.
Drafted Butch Huskey in the 7th round of the 1989 amateur draft. Player signed June 6, 1989.
Drafted Mark Grudzielanek in the 17th round of the 1989 amateur draft, but did not sign the player.
Drafted Mike Thomas in the 23rd round of the 1989 amateur draft.
Drafted Joe Vitko in the 24th round of the 1989 amateur draft.
Drafted Dave Telgheder in the 31st round of the 1989 amateur draft. Player signed June 8, 1989.
- June 9, 1989
Signed Lou Thornton as a free agent.
Traded Terry Leach to the Kansas City Royals. Received a player to be named later. The Kansas City Royals sent Aguedo Vasquez (minors) (October 1, 1989) to the New York Mets to complete the trade.
- June 18, 1989
Traded a player to be named later, Lenny Dykstra and Roger McDowell to the Philadelphia Phillies. Received Juan Samuel. The New York Mets sent Tom Edens (July 27, 1989) to the Philadelphia Phillies to complete the trade.
- July 10, 1989
Traded Marcus Lawton to the New York Yankees. Received Scott Nielsen.
- July 31, 1989
Traded a player to be named later, Rick Aguilera, Tim Drummond, Kevin Tapani and David West to the Minnesota Twins. Received Frank Viola. The New York Mets sent Jack Savage (October 16, 1989) to the Minnesota Twins to complete the trade.
Traded Mookie Wilson to the Toronto Blue Jays. Received Mike Brady (minors) and Jeff Musselman.
Lee Mazzilli selected by the Toronto Blue Jays off waivers.
- August 1, 1989
Purchased Manny Hernández from the Minnesota Twins.
- August 6, 1989
Purchased Mike Trujillo from the Detroit Tigers.
- September 29, 1989
Released Jeff McKnight.
- October 3, 1989
Released Manny Hernández.
- October 15, 1989
Mark Bailey granted Free Agency.
Scott Nielsen granted Free Agency.
Mike Trujillo granted Free Agency.
- November 13, 1989
Don Aase granted Free Agency.
Keith Hernandez granted Free Agency.
- November 14, 1989
Released Gary Carter.
- November 20, 1989
Signed Guillermo Garcia as an amateur free agent.
- November 22, 1989
Signed Quilvio Veras as an amateur free agent.
- December 4, 1989
Drafted Brent Knackert from the Chicago White Sox in the 1989 rule 5 draft.
- December 5, 1989
Traded Joaquin Contreras (minors) and John Mitchell to the Baltimore Orioles. Received Cesar Mejia (minors) and Keith Hughes.
- December 6, 1989
Traded Kip Gross and Randy Myers to the Cincinnati Reds. Received Don Brown (minors) and John Franco.
- December 12, 1989
Signed Orlando Mercado as a free agent.
- December 13, 1989
Signed Kelvin Torve as a free agent.
- December 20, 1989
Traded Juan Samuel to the Los Angeles Dodgers. Received Mike Marshall and Alejandro Peña.
- January 5, 1990
Traded Craig Repoz (minors) to the San Diego Padres. Received Nikco Riesgo.
- March 26, 1990
Signed D.J. Dozier as an amateur free agent.
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