Jimmie Foxx Hits #51
Sep 3 A's first baseman Jimmie Foxx smashes his 50th & 51st home runs to become only 3rd player to reach 50 in a MLB season; joins Babe Ruth & Hack Wilson
US Men's Tennis Open
Sep 10 US National Championship Men's Tennis, Forest Hills: American Ellsworth Vines successfully defends his title; beats Frenchman Henri Cochet 6–4, 6–4, 6–4
- Sep 12 Brooklyn Dodger Johnny Frederick hits his record 6th pinch hit HR
- Sep 13 NY Yankees clinch their 7th AL pennant
- Sep 20 Chicago Cubs clinch the NL pennant
- Sep 25 Jimmie Foxx hits his 58th HR in last game of season