On September 18, 1903 — In the absence of official sanction, the presidents of the pennant-winning clubs in the National and American Leagues sign an agreement to meet in a best-of-nine series for the championship. The Pirates will clinch the pennant tomorrow.

 


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