- Jan 1 7th Rose Bowl: California beats Ohio State 28-0
- Jan 12 Kenesaw Mountain Landis becomes 1st commissioner of baseball
- Jan 26 Soccer team GVAV of Groningen Neth forms
- Jan 26 Toronto NHL center Corb Denneny scores 6 goals to lead St. Patricks to a 10-3 win over Hamilton Tigers in Toronto
- Feb 15 Arthur Mailey completes 9-121 v England, Australian Test Cricket rec
- Mar 1 Spin bowler Arthur Mailey takes 5 for 119 (record 36 wickets for series) to lead Australia to a 9 wicket 5th Test win over England in Sydney; first ever, 5-0 Ashes cricket series win for Australia
- Mar 18 80th Grand National: Fred Rees wins aboard 100/9 bet Shaun Spadah; winner is only horse to complete the course without falling
- Apr 4 Stanley Cup Final, Denman Arena, Vancouver, BC: Ottawa Senators (NHL) beat Vancouver Millionaires (PCHA), 2-1 for a 3-2 series victory
- Apr 11 KDKA broadcast 1st radio sporting event, a boxing match (Ray-Dundee)
- Apr 14 NHL Championship: Ottawa Senators sweep Toronto St Patricks in 2 games
- Apr 18 25th Boston Marathon won by Frank Zuna in race record 2:18:57.6
- Apr 30 American Professional Football Association reorganizes in Akron
- Apr 30 1st American Professional Football Association Championship (1920): undefeated Akron Pros awarded inaugural title
- May 6 American Soccer League forms
- May 7 47th Kentucky Derby: Charles Thompson on Behave Yourself wins 2:04.2
- May 16 46th Preakness: F Coltiletti aboard Broomspun wins in 1:54.2
- May 30 Indianapolis 500: Tommy Milton wins in 5:34:44.578 (144.231 km/h)
- Jun 10 Babe Ruth becomes all time HR champ with #120 (Gavvy Cravath)
- Jun 11 53rd Belmont: Earl Sande riding Grey Lag wins in 2:16.8
- Jun 13 Yanks' pitcher Babe Ruth hits 2 HRs beating Tigers 11-8
- Jun 21 HSC '21 soccer team forms in Haaksbergen
- Jun 25 British Open Golf, St Andrews: former local Jock Hutchison (resident in US) wins his only Open Championship by 9 strokes in a 36-hole playoff over amateur Roger Wethered
Tennis Open
Jun 29 Wimbledon Women's Tennis: Suzanne Lenglen of France beats doubles specialist Elizabeth Ryan 6-2, 6-0 for her 3rd straight Wimbledon singles title
Elizabeth Ryan
- Jul 2 Wimbledon Men's Tennis: Bill Tilden beats South African Brian Norton 4-6, 2-6, 6-1, 6-0, 7-5 for the third of 10 Grand Slam singles titles
Boxing Title Fight
Jul 2 Jack Dempsey KOs French boxer Georges Carpentier in 4 in 3rd heavyweight title defence, crowd of 91,000 brings in 1st million dollar gate ($1.7m)
Jack Dempsey
US Golf Open
Jul 22 US Open Men's Golf, Columbia CC: Englishman Jim Barnes wins the 3rd of his 4 major titles by 9 strokes ahead of runners-up Walter Hagen and Fred McLeod
Jim Barnes
Walter Hagen
- Aug 2 After 3 hours deliberation a Chicago jury acquits 8 Chicago White Sox accused in Black Sox scandal, next day banned from organised baseball for life
- Aug 3 MLB Commissioner Kenesaw Landis hands out life bans to 8 Chicago White Sox players accused in Black Sox scandal despite their acquittal by a Chicago jury
- Aug 5 KDKA Pittsburgh presents first radio broadcast of MLB; Pirates beat Phillies, 8-0; Harold Arlin first play-by-play broadcaster
- Aug 7 Dutch cyclist Piet Moeskops wins the 1st of 4 straight, and 5 total world sprint championships when he beats defending champion Bob Spears of Australia in Copenhagen
- Aug 20 35th U.S. Women's National Championship: Molla Bjurstedt Mallory beats Mary Browne (4-6, 6-4, 6-2)
- Aug 25 Yankee pitcher Harry Harper hits 3 batters in an inning tying record
- Aug 27 J E Clair of Acme Packing Co of Green Bay granted an NFL franchise
- Aug 28 Babe Ruth starts streak of an extra-base hit in 9 straight games
- Sep 3 International Lawn Tennis Challenge, New York: Watson Washburn and William Norris win their doubles rubber to clinch US win over Japan; Americans go on to win 5-0
Baseball Record
Sep 5 Walter Johnson sets strikeout mark at 2,287
Walter Johnson
- Sep 19 US National Championship Men's Tennis, Germantown Cricket Club, Philadelphia: Bill Tilden successfully defends title; beats Wallace F. Johnson 6-1, 6-3, 6-1
PGA Championship
Sep 28 4th PGA Championship: Walter Hagen at Inwood CC Far Rockaway NY
Walter Hagen
- Oct 1 PGA Championship, Inwood CC: Walter Hagen beats former champion Jim Barnes of England 3 & 2; Hagan's third major title
- Oct 2 New York Yankees outfielder Babe Ruth hits then record 59th HR in 7-6 win over former club Boston Red Sox at Polo Grounds
- Oct 2 Chicago White Sox backstop Ray Schalk becomes the first and only MLB catcher to make a putout at all bases; White Sox beat Indians 7-4
- Oct 5 First Baseball World Series radio broadcast; all-NY contest, Yanks beat Giants, 3-0 at Polo Grounds; sportswriter Grantland Rice is the caller
- Oct 6 Fewest hits in World Series Game, 5, Yanks (3) beat Giants (2), 3-0
- Oct 9 Babe Ruth's 1st WS homer; only Sunday game ever pitched by Carl Mays
- Oct 10 NFL Decatur Staleys become Chicago Staleys, win 14-10
- Oct 13 NY Giants beat NY Yankees, 5 games to 3 in 18th World Series
- Oct 16 Babe Ruth, Bob Meusel, & Bill Piercy defy Landis ban on World Series
- Oct 16 Jim Conzelman takes over as coach of Rock Island Independents from Frank Coughlin-only mid-game coaching change in NFL history
- Oct 23 Green Bay Packers play 1st NFL game, 7-6 win over Minneapolis
- Oct 31 Federation Sportive Feminine International forms (1st woman track & field association)
- Dec 3 CFL Grey Cup, Varsity Stadium, Toronto: Toronto Argonauts win 2nd Championship; beat Edmonton Eskimos, 23-0
- Dec 4 American Professional Football Association Championship, Cubs Park, Chicago: Chicago Staleys beat Buffalo All-Americans, 10-7 in de facto championship game after teams tied in standings
- Dec 20 AL votes to return to best-of-7 World Series, while NL votes best-of-9 Judge Kenesaw Mountain Landis casts deciding vote for best-of-7
- Dec 24 Ottawa’s Harry Broadbent scores in 10-0 Senators blowout of the Montreal Canadiens; first in 16-game NHL record goal-scoring streak; Charlie Simmer’s 13 game streak (1979) is considered modern-day record
- Dec 31 Australasian Championships Men's Tennis, Perth: Australian Rhys Gemmell beats countryman Alf Hedeman 7-5, 6-1, 6-4