- Sep 2 Ralph Houk signs 3-year contract to manage New York Yankees at $65,000 a season, then the biggest salary in MLB
- Sep 7 Scottish Matra-Ford driver Jackie Stewart wins the Italian Grand Prix at Monza to clinch his first Formula 1 World Drivers Championship; his 6th F1 win of the season
- Sep 8 US amateur Men's Tennis: Stan Smith beats Bob Lutz (97 63 61)
US Open Women's Tennis
Sep 8 US Open Women's Tennis, Forest Hills, NY: Australian Margaret Court wins her third US singles title & 16th Grand Slam singles event; beats Nancy Richey 6-2, 6-2
Nancy Richey
US Men's Tennis Open
Sep 9 US Open Men's Tennis, Forest Hills, NY: Rod Laver beats fellow Australian Tony Roche 7-9, 6-1, 6-2, 6-2 to claim his record second Grand Slam
Rod Laver
Tony Roche
- Sep 10 NY Mets sweep Montreal Expos putting them in 1st place for 1st time
- Sep 13 Baltimore Orioles, win earliest AL Eastern division title
- Sep 13 San Francisco Giant Bobby Bonds is baseballs 4th 30-HR, 30-steal player
Event of Interest
Sep 15 Cards Steve Carlton sets record by striking out 19 NY Mets in a game
Steve Carlton
Ryder Cup
Sep 20 Ryder Cup Golf, Royal Birkdale GC: US, Great Britain tie, 16-16; great sporting gesture, America's Jack Nicklaus concedes missable 3-foot putt to Tony Jacklin at the 18th hole for the draw
Jack Nicklaus
- Sep 20 Pitts Pirate Bob Moose no-hits NY Mets, 4-0
Davis Cup
Sep 20 58th Davis Cup: American pair Bob Lutz & Stan Smith clinch final 8-6, 6-1, 11-9 over Ilie Năstase & Ion Țiriac of Romania in Cleveland, OH; ends 5-0
Ilie Năstase
Baseball Record
Sep 22 SF Giant Willie Mays, becomes second player to hit 600 home runs
Willie Mays