- Jan 1 3rd Rose Bowl, Tournament Park, Pasadena, California: Oregon beats Pennsylvania, 14-0; MVP: John Beckett, Oregon
- Feb 24 Red Sox sell Smokey Joe Wood, his arm dead at 26, to Cleveland for $15,000
- Mar 11 1st NHL championship game ever played, Toronto Arenas beats Montreal Canadiens 7-3 in 1st of 2 game set (second game on March 13)
- Mar 26 Stanley Cup Final, Seattle Ice Arena, Seattle, WA: Seattle Metropolitans (PCHA) beat Montreal Canadiens (NHL), 9-1 for a 3-1 series victory; first US team to win SC
- Apr 14 Chicago White Sox pitcher Ed Cicotte no-hits St Louis Browns, 11-0
- Apr 16 21st Boston Marathon won by Bill Kennedy in 2:28:37.2
- Apr 24 NY Yankees left-handed pitcher George Mogridge no-hits Boston Red Sox, 2-1 at Fenway Park
- May 5 St Louis Browns pitcher Ernie Koob no-hits Chicago White Sox, 1-0 at Sportsman's Park III
- May 6 St Louis Browns pitcher Bob Groom no-hits Chicago White Sox, 3-0 at Sportsman's Park, St. Louis
Ruth Leads Victory
May 7 In a testament to his pitching ability, future Baseball Hall of Fame slugger Babe Ruth leads Boston Red Sox to a 1-0 victory against Washington Senators legend Walter Johnson
- May 12 42nd Preakness: E Haynes aboard Kalitan wins in 1:54.4
- May 12 43rd Kentucky Derby: Charles Borel on Omar Khayyam wins in 2:04.6
- May 26 Walt Cruise hit 1st HR out of Braves Field
- Jun 1 Boston Braves first baseman Hank Gowdy is first active MLB player to enlist for service in World War I; only player to fight in both World War I & II
- Jun 16 49th Belmont: James Butwell aboard Hourless wins in 2:17.8
- Jun 23 US National Championship Women's Tennis, Forest Hills, NY: Two-time defending champion Molla Bjurstedt beats Marion Vanderhoef 4-6, 6-0, 6-2
- Jul 1 In contravention of state law, Robins (Dodgers) play their 1st Sunday MLB game in Brooklyn; owner and manager arrested but escape with a fine; Robins edge Philadelphia, 3-2
- Jul 1 Reds' Fred Toney pitches 2 complete games in doubleheader victories over Pirates, allows 3 hits each game, fewest allowed by any pitcher winning 2 MLB games in one day
- Aug 13 Milt Stock (2), Fred Luderus (2) and Possum Whitted of the Philadelphia Phillies steal 5 bases in an inning in 3-0 win against Boston at Braves Field
- Aug 19 Sunday benefit baseball game at NYC's Polo Grounds results in John McGraw & Christy Mathewson's arrest for violating Blue laws
- Aug 22 Pittsburgh Pirates play 4th straight extra inning game; left fielder Carson Bigbee sets MLB record of 11 at-bats in 22 inning, 6-5 loss to Brooklyn Dodgers at Ebbets Field
- Aug 25 US National Championship Men's Tennis, Forest Hills, NY: Robert Lindley Murray beats Nathaniel W. Niles 5-7, 8-6, 6-3, 6-3 for first of 2 straight US singles titles
Honus Wagner Retires
Sep 17 Honus Wagner, retires at 43, Pirates retire his #33
- Oct 15 Baseball World Series: Chicago White Sox beat NY Giants, 4-2 at Brush Stadium to clinch series, 4-2 for their second WS triumph
- Nov 26 NHL forms with Montreal Canadiens, Montreal Maroons, Toronto Arenas, Ottawa Senators & Quebec Bulldogs; National Hockey Association disbands
- Dec 19 1st NHL game played on artificial ice in Toronto
- Dec 19 Quebec Bulldogs play their 1st professional hockey game
- Dec 22 In the NHL's first official week of play, 3 players score hat tricks in the same game, for the same team; Corb Denneny, Reg Noble, & Harry Meeking each score 3 for the Toronto Arenas in an 11-4 win over the Ottawa Senators
- Dec 26 1st NHL defensemen to score a goal: Toronto Maple Leaf Harry Cameron
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