Transactions
Transactions listed are from October 1 of previous year to April 1 of the following year.
- 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.
- April 5, 1990
Brent Knackert selected by the Seattle Mariners off waivers.
- April 30, 1990
Selected Daryl Boston off waivers from the Chicago White Sox.
- June 4, 1990
Drafted Jeromy Burnitz in the 1st round (17th pick) of the 1990 amateur draft. Player signed June 13, 1990.
Drafted Aaron Ledesma in the 2nd round of the 1990 amateur draft. Player signed June 5, 1990.
Drafted Micah Franklin in the 3rd round of the 1990 amateur draft. Player signed June 10, 1990.
Drafted Pete Walker in the 7th round of the 1990 amateur draft. Player signed June 6, 1990.
Drafted Raúl Casanova in the 8th round of the 1990 amateur draft. Player signed June 11, 1990.
Drafted Fernando Viña in the 9th round of the 1990 amateur draft. Player signed June 11, 1990.
Drafted Darren Dreifort in the 11th round of the 1990 amateur draft, but did not sign the player.
Drafted Steve Soderstrom in the 15th round of the 1990 amateur draft, but did not sign the player.
Drafted Brian Daubach in the 17th round of the 1990 amateur draft. Player signed June 15, 1990.
Drafted Will Brunson in the 29th round of the 1990 amateur draft, but did not sign the player.
Drafted Andrew Lorraine in the 38th round of the 1990 amateur draft, but did not sign the player.
Drafted Ricky Otero in the 45th round of the 1990 amateur draft. Player signed September 10, 1990.
Drafted Rick Helling in the 50th round of the 1990 amateur draft, but did not sign the player.
- June 12, 1990
Signed Doug Sisk as a free agent.
- June 14, 1990
Released Shawn Barton.
- June 19, 1990
Traded Brian Givens to the Seattle Mariners. Received Mario Díaz.
- July 22, 1990
Traded Doug Sisk to the Atlanta Braves. Received Tony Valle (minors).
- July 27, 1990
Traded Mike Marshall to the Boston Red Sox. Received a player to be named later, Ed Perozo (minors) and Greg Hansell. The Boston Red Sox sent Paul Williams (minors) (November 19, 1990) to the New York Mets to complete the trade.
- August 3, 1990
Signed Alex Treviño as a free agent.
- August 30, 1990
Traded Rocky Elli (minors) and Nikco Riesgo to the Philadelphia Phillies. Received Tom Herr.
Traded players to be named later to the Milwaukee Brewers. Received a player to be named later and Charlie O'Brien. The New York Mets sent Julio Machado (September 7, 1990) and Kevin Brown (September 7, 1990) to the Milwaukee Brewers to complete the trade. The Milwaukee Brewers sent Kevin Carmody (minors) (September 11, 1990) to the New York Mets to complete the trade.
Traded Archie Corbin to the Kansas City Royals. Received Pat Tabler.
Orlando Mercado selected by the Montreal Expos off waivers.
- September 4, 1990
Released Barry Lyons.
- September 6, 1990
Signed Ramón Tatís as an amateur free agent.
- September 7, 1990
Signed Guillermo Mota as an amateur free agent.
Alex Treviño selected by the Cincinnati Reds off waivers.
- September 10, 1990
Traded Nick Davis (minors) and Steve Larose (minors) to the Houston Astros. Received Dan Schatzeder.
- October 15, 1990
Mario Díaz granted Free Agency.
Dave Liddell granted Free Agency.
Lou Thornton granted Free Agency.
Kelvin Torve granted Free Agency.
Tom O'Malley player rights sold to Hanshin Tigers (Japan Central).
- November 5, 1990
Dan Schatzeder granted Free Agency.
Darryl Strawberry granted Free Agency.
Pat Tabler granted Free Agency.
- November 13, 1990
Released Keith Hughes.
Released Chris Jelic.
- December 3, 1990
Pat Howell drafted by the Minnesota Twins in the 1990 rule 5 draft.
Drafted Doug Simons from the Minnesota Twins in the 1990 rule 5 draft.
Craig Shipley selected by the San Diego Padres in the 1990 minor league draft.
- December 5, 1990
Signed Vince Coleman as a free agent.
- December 13, 1990
Signed Terry Puhl as a free agent.
- December 15, 1990
Traded Greg Hansell and Bob Ojeda to the Los Angeles Dodgers. Received Hubie Brooks.
- December 20, 1990
Jeff Musselman granted Free Agency.
- January 10, 1991
Signed Kelvin Torve as a free agent.
- January 21, 1991
Signed Rick Cerone as a free agent.
- January 22, 1991
Signed Rich Sauveur as a free agent.
- February 19, 1991
Signed Edgardo Alfonzo as an amateur free agent.
- March 15, 1991
Signed Rafael Roque as an amateur free agent.
- April 1, 1991
Released Terry Puhl.
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