Gaylord Perry is the first 20-game winner of the year, pitching the Giants into first place with a 6 – 1 win against the Braves.

On August 20, 1966 — Gaylord Perry is the first 20-game winner of the year, pitching the Giants into first place with a 6 – 1 win against the Braves.


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Sources:
Baseball Reference August 20
National Pastime August 20
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game