| Postseason: |
Lost NL Championship Series (3-0) to Cincinnati Reds |
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Transactions listed are from November 1 of previous year to April 1 of the following year.
October 21, 1969
Traded Frank Vanzin (minors) and Carl Taylor to the St. Louis Cardinals. Received Dave Giusti and Dave Ricketts.
1970
Ed Acosta received from the Houston Astros in an unknown transaction.
Signed Lafayette Currence as an amateur free agent.
Signed Jim Sadowski as an amateur free agent.
January 28, 1970
Traded Del Bates to the Philadelphia Phillies. Received Mike Everett (minors) and Dave Bennett.
February 4, 1970
Traded Bo Belinsky to the Cincinnati Reds. Received Dennis Ribant.
April 24, 1970 (Standings)
Signed Al McBean as a free agent.
May 18, 1970 (Standings)
Released Al McBean.
June 4, 1970 (Standings)
Drafted John Caneira in the 11th round of the 1970 amateur draft, but did not sign the player.
Drafted Dave Parker in the 14th round of the 1970 amateur draft.
Drafted Ed Ott in the 23rd round of the 1970 amateur draft.
June 9, 1970 (Standings)
Signed Orlando Pena as a free agent.
June 22, 1970 (Standings)
Chuck Hartenstein selected by the St. Louis Cardinals off waivers.
July 14, 1970 (Standings)
Signed Mario Mendoza as an amateur free agent.
July 25, 1970 (Standings)
Signed Jimmy Sexton as an amateur free agent.
August 26, 1970 (Standings)
Released Orlando Pena.
August 31, 1970 (Standings)
Traded Denny Riddleberger and cash to the Washington Senators. Received George Brunet.
September 9, 1970 (Standings)
Released Dave Ricketts.
September 14, 1970 (Standings)
Traded a player to be named later to the Oakland Athletics. Received Mudcat Grant. The Pittsburgh Pirates sent Angel Mangual (October 20, 1970) to the Oakland Athletics to complete the trade.
October 15, 1970 (Standings)
Traded Ed Pacheco (minors), Jerry Branch (minors) and Tom Frondorf (minors) to the New York Yankees. Received Dave Kent (minors), Gary Washington (minors) and Charlie Sands.
October 16, 1970
Sent George Kopacz to the Milwaukee Brewers as part of a conditional deal.
October 26, 1970
Released Joe Gibbon.
December 2, 1970
Traded Bruce Dal Canton, Jerry May and Freddie Patek to the Kansas City Royals. Received Jim Campanis, Jackie Hernandez and Bob Johnson.
January 7, 1971
Signed Fernando Gonzalez as a free agent.
January 18, 1971
Signed Tony Armas as an amateur free agent.
January 29, 1971
Traded Matty Alou and George Brunet to the St. Louis Cardinals. Received Nelson Briles and Vic Davalillo.
February 10, 1971
Traded Danny Rivas (minors) to Mexico City Reds (Mexican). Received Ramon Hernandez.
March 25, 1971
Received George Kopacz from the Milwaukee Brewers as part of a conditional deal.