In beating St. Louis 4 – 1 on four hits, Johnny Antonelli becomes the first lefty to win 20 games for the Giants since Carl Hubbell and Cliff Melton in 1937.

This Day In Baseball

On August 30, 1954 — In beating St. Louis 4 – 1 on four hits, Johnny Antonelli becomes the first lefty to win 20 games for the Giants since Carl Hubbell and Cliff Melton in 1937.

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Sources:
Baseball Reference August 30
National Pastime August 30
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game