1929 – A Pirates loss to the Braves clinches the National League pennant for the Cubs.

This Day In Baseball

On September 18, 1929 — 1929 – A Pirates loss to the Braves clinches the National League pennant for the Cubs.

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