Transactions
Transactions listed are from October 1 of previous year to April 1 of the following year.
- November 9, 1987
Larry Andersen granted Free Agency.
José Cruz granted Free Agency.
Danny Darwin granted Free Agency.
Dave Smith granted Free Agency.
Dickie Thon granted Free Agency.
- November 12, 1987
Released Davey Lopes.
- November 27, 1987
Signed Craig Smajstrla as a free agent.
- December 7, 1987
Drafted Scott Medvin from the Pittsburgh Pirates in the 1987 rule 5 draft.
- December 8, 1987
Traded Mike Stoker (minors) and Ed Whited to the Atlanta Braves. Received Rafael Ramírez and cash.
- December 14, 1987
Traded Randy Randle (minors) to the Boston Red Sox. Received Marc Sullivan.
- December 16, 1987
Signed Pat Keedy as a free agent.
- December 21, 1987
Released Buddy Biancalana.
- December 29, 1987
Signed Luis DeLeón as a free agent.
- January 8, 1988
Signed Larry Andersen as a free agent.
Signed Joaquín Andújar as a free agent.
Signed Danny Darwin as a free agent.
Signed Dave Smith as a free agent.
- January 29, 1988
Signed Jim Weaver as a free agent.
- March 10, 1988
Signed Ernie Camacho as a free agent.
Signed Steve Henderson as a free agent.
- March 25, 1988
Traded Robbie Wine to the Texas Rangers. Received Mike Loynd.
- April 4, 1988
Returned Scott Medvin (earlier draft pick) to the Pittsburgh Pirates.
- April 12, 1988
Signed Alex Treviño as a free agent.
- June 1, 1988
Drafted Dave Silvestri in the 2nd round of the 1988 amateur draft. Player signed October 18, 1988.
Drafted Scott Servais in the 3rd round of the 1988 amateur draft. Player signed June 2, 1988.
Drafted Luis Gonzalez in the 4th round of the 1988 amateur draft. Player signed June 2, 1988.
Drafted Chris Gardner in the 6th round of the 1988 amateur draft.
Drafted Kenny Lofton in the 17th round of the 1988 amateur draft. Player signed June 16, 1988.
Drafted Mike Durant in the 19th round of the 1988 amateur draft, but did not sign the player.
Drafted Chris Tremie in the 41st round of the 1988 amateur draft, but did not sign the player.
- June 17, 1988
Signed José Tolentino as a free agent.
- June 19, 1988
Traded a player to be named later to the Cincinnati Reds. Received Buddy Bell. The Houston Astros sent Carl Grovom (minors) (October 20, 1988) to the Cincinnati Reds to complete the trade.
- July 23, 1988
Traded Mark Bailey to the Montreal Expos. Received Casey Candaele.
- August 17, 1988
Signed Harry Spilman as a free agent.
- August 31, 1988
Traded Denny Walling to the St. Louis Cardinals. Received Bob Forsch.
- October 3, 1988
Released Steve Henderson.
- October 15, 1988
Ernie Camacho granted Free Agency.
Jeff Datz granted Free Agency.
Luis DeLeón granted Free Agency.
Manny Hernández granted Free Agency.
Pat Keedy granted Free Agency.
Jim Weaver granted Free Agency.
- November 4, 1988
Joaquín Andújar granted Free Agency.
Bob Forsch granted Free Agency.
Craig Reynolds granted Free Agency.
Nolan Ryan granted Free Agency.
Harry Spilman granted Free Agency.
Alex Treviño granted Free Agency.
- November 17, 1988
Released Jim Pankovits.
Released Craig Smajstrla.
- December 4, 1988
Traded a player to be named later to the Minnesota Twins. Received Mark Portugal. The Houston Astros sent Todd McClure (minors) (December 7, 1988) to the Minnesota Twins to complete the trade.
- December 5, 1988
Drafted Dave Stapleton from the Milwaukee Brewers in the 1988 rule 5 draft.
- December 13, 1988
Traded Dan Walters to the San Diego Padres. Received Ed Vosberg.
- December 14, 1988
Signed Craig Smajstrla as a free agent.
- December 16, 1988
Signed Jim Clancy as a free agent.
Signed Craig Reynolds as a free agent.
- December 21, 1988
- December 22, 1988
Signed Dave Johnson as a free agent.
- January 10, 1989
Traded Pedro DeLeon (minors), Mike Hook (minors) and John Fishel to the New York Yankees. Received Rick Rhoden.
- January 30, 1989
Signed Dan Schatzeder as a free agent.
- February 7, 1989
Signed Harry Spilman as a free agent.
Signed Ron Washington as a free agent.
- February 16, 1989
Signed Roger Mason as a free agent.
- March 21, 1989
Traded players to be named later to the Minnesota Twins. Received Steve Lombardozzi. 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 31, 1989
Traded Vic Hithe (minors) and Dave Johnson to the Baltimore Orioles. Received Carl Nichols.
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