- Sep 1 New York Highlanders win their 6th consecutive MLB game in 3 days from Washington Senators; sweep AL record 3 straight double headers
- Sep 1 Philadelphia beats the Red Sox 4-1 in 24 innings in Boston in the longest game in AL baseball history; both starters go the distance as A's hurler Jack Coombs overcomes Boston's Joe Harris
- Sep 3 After an 8 minute argument over an umpire call the NY Highlanders win on forfeit over Philadelphia A's; Highlanders' MLB record 5th doubleheader sweep on consecutive days
- Sep 3 Philadelphia Giants win Negro Championship Cup in Philadelphia before 10,000 fans; black baseball's largest crowd ever
- Sep 4 New York Highlanders beat Boston Pilgrims, 7 - 0 and 1 - 0 for their MLB record 5th straight doubleheader sweep
- Sep 5 Saint Louis University quarterback Bradbury Robinson throws first legal forward pass in the history of American football for a TD to Jack Schneider at Carroll College, Waukesha, Wisconsin; Saint Louis wins, 22-0
- Sep 16 Kaarlo Nieminen wins 1st Finnish marathon
Eddie Collins Debuts
Sep 17 Playing as "Sullivan" Columbia University jr Eddie Collins debuts with A's
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