Lefty Grove wins his 30th game, beating the White Sox, 3 – 1, on five hits. He is the first to win 30 since Jim Bagby of Cleveland in 1920 and will be the last American League hurler to do so until Denny McLain in 1968.

This Day In Baseball

On September 18, 1931 — Lefty Grove wins his 30th game, beating the White Sox, 3 – 1, on five hits. He is the first to win 30 since Jim Bagby of Cleveland in 1920 and will be the last American League hurler to do so until Denny McLain in 1968.

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Sources:
Baseball Reference September 18
National Pastime September 18
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game