1965 – A 20-game winner in 1964, Larry Jackson loses his 20th game of 1965, as the Phillies sweep a twin bill from the Cubs, 11 – 5 and 7 – 4. Jackson is the first pitcher since Murry Dickson of the 1951-1952 Pirates to follow a 20-win season with 20 losses.

This Day In Baseball

On September 23, 1965 — 1965 – A 20-game winner in 1964, Larry Jackson loses his 20th game of 1965, as the Phillies sweep a twin bill from the Cubs, 11 – 5 and 7 – 4. Jackson is the first pitcher since Murry Dickson of the 1951-1952 Pirates to follow a 20-win season with 20 losses.

 

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Sources:
Baseball Reference September 23
National Pastime September 23
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game