Due to the terrorist attacks on the World Trade Center and the Pentagon, Major League Baseball postpones all games through September 17. The 91 missed games, the most regular-season contests not played since World War I forced the cancellation of the final month of the 1918 season, have been re-scheduled for the week after the regular season ends, meaning the World Series is likely to extend into November for the first time in history.

On September 13, 2001 — Due to the terrorist attacks on the World Trade Center and the Pentagon, Major League Baseball postpones all games through September 17. The 91 missed games, the most regular-season contests not played since World War I forced the cancellation of the final month of the 1918 season, have been re-scheduled for the week after the regular season ends, meaning the World Series is likely to extend into November for the first time in history.

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