On September 13, 1958 — 1958 – The Braves’ Warren Spahn becomes the first lefty to win 20 or more games nine times, as he beats St. Louis, 8 – 2. Eddie Plank and Lefty Grove each won 20 games eight times.

 


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Sources:
Baseball Reference September 13
National Pastime
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game