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Transactions listed are from November 1 of previous year to April 1 of the following year.
October 3, 1979
Released Mickey Lolich.
October 19, 1979
Released Bobby Tolan.
November 1, 1979
Jay Johnstone granted Free Agency.
November 19, 1979
Signed Rick Wise as a free agent.
November 26, 1979
Signed John Curtis as a free agent.
November 27, 1979
Traded Bill Almon and Dan Briggs to the Montreal Expos. Received Dave Cash.
December 3, 1979
Selected Von Joshua off waivers from the Los Angeles Dodgers.
December 7, 1979
Purchased Aurelio Rodriguez from the Detroit Tigers for $200,000.
January 11, 1980
Drafted Ken Dowell in the 1st round (6th pick) of the 1980 amateur draft (January), but did not sign the player.
Drafted Curt Wardle in the 2nd round of the 1980 amateur draft (January), but did not sign the player.
January 30, 1980
Sold Sam Perlozzo to Yakult Swallows (Japan Central).
February 15, 1980
Released Fernando Gonzalez.
Traded Joe Carroll (minors), Tucker Ashford and Gaylord Perry to the Texas Rangers. Received Willie Montanez.
Traded Bob Owchinko and Jim Wilhelm to the Cleveland Indians. Received Jerry Mumphrey.
April 2, 1980 (Standings)
Signed Danny Boone as a free agent.
April 28, 1980 (Standings)
Signed Luis Quinones as an amateur free agent.
June 3, 1980 (Standings)
Drafted Ron Romanick in the 1st round (7th pick) of the 1980 amateur draft (June Secondary), but did not sign the player.
Drafted Gerry Davis in the 6th round of the 1980 amateur draft.
Drafted George Hinshaw in the 11th round of the 1980 amateur draft.
Drafted Glen Cook in the 17th round of the 1980 amateur draft, but did not sign the player.
Drafted Mike Couchee in the 19th round of the 1980 amateur draft.
Drafted Jeff Robinson in the 40th round of the 1980 amateur draft, but did not sign the player.
August 4, 1980 (Standings)
Sold Aurelio Rodriguez to the New York Yankees.
August 5, 1980 (Standings)
Traded a player to be named later and Kurt Bevacqua to the Pittsburgh Pirates. Received Rick Lancellotti and Luis Salazar. The San Diego Padres sent Mark Lee (August 12, 1980) to the Pittsburgh Pirates to complete the trade.
August 11, 1980 (Standings)
Released Von Joshua.
Released Fred Kendall.
Traded John D'Acquisto and cash to the Montreal Expos. Received a player to be named later. The Montreal Expos sent Randy Bass (September 5, 1980) to the San Diego Padres to complete the trade.
August 31, 1980 (Standings)
Traded Willie Montanez to the Montreal Expos. Received Tony Phillips and cash.
October 22, 1980
Dave Winfield granted Free Agency.
December 8, 1980
Released Paul Dade.
Drafted Mario Ramirez from the New York Mets in the 1980 rule 5 draft.
Drafted Alan Wiggins from the Los Angeles Dodgers in the 1980 rule 5 draft.
Traded a player to be named later, Rollie Fingers, Bob Shirley and Gene Tenace to the St. Louis Cardinals. Received Terry Kennedy, John Littlefield, Al Olmsted, Mike Phillips, Kim Seaman, Steve Swisher and John Urrea. The San Diego Padres sent Bob Geren (December 10, 1980) to the St. Louis Cardinals to complete the trade.
Traded Chuck Baker to the Minnesota Twins. Received Dave Edwards.
December 12, 1980
Traded Dennis Kinney to the Detroit Tigers. Received Dave Stegman.
December 15, 1980
Sold Rick Sweet to the New York Mets.
Traded Randy Jones to the New York Mets. Received Jose Moreno and John Pacella.
December 17, 1980
Signed Ozzie Guillen as an amateur free agent.
January 13, 1981
Drafted Eric Bullock in the 1st round (5th pick) of the 1981 amateur draft (January Secondary), but did not sign the player.
January 15, 1981
Signed Kevin Bell as a free agent.
March 24, 1981
Sold Bill Fahey to the Detroit Tigers.
March 27, 1981
Released Eric Rasmussen.
Traded Eric Mustad (minors), Kevin Bell and Tony Phillips to the Oakland Athletics. Received Roy Moretti (minors) and Bob Lacey.
March 31, 1981
Traded Jerry Mumphrey and John Pacella to the New York Yankees. Received Ruppert Jones, Joe Lefebvre, Tim Lollar and Chris Welsh.
April 1, 1981
Traded Bob Lacey to the Cleveland Indians. Received Juan Bonilla.