- April 15
- New York Giants pitcher Rube Marquard no-hits Brooklyn Dodgers, 2-0. [1]
- April 19
- 19th Boston Marathon won by Edouard Fabre of Canada in 2:31:41.2. [1]
- April 22
- New York Yankees don pinstripes and hat-in-the-ring logo for first time. [1]
- April 24
- Pittsburgh Rebels' Frank Allen no-hits Saint Louis Terriers (Federal League), 2-0. [1]
- May 6
- Boston Red Sox' Babe Ruth pitching debut and first homerun, loses to New York Yankees 4-3 in 15. [1]
- May 8
- 41st Kentucky Derby: Joe Notter aboard Regret wins in 2:05.4. [1]
- May 17
- 40th Preakness: Douglas Hoffman aboard Rhine Maiden wins in 1:58. [1]
- Chicago Cubs' George "Zip" Zabel relieves with two outs in first and winds up with 4-3 19-inning win over Brooklyn Dodgers in longest relief job ever. [1]
- May 25
- Chicago Whales' pitcher Claude Hendrix no-hits Pittsburgh Rebels (Federal League), 10-0. [1]
- June 18
- Jerome Travers becomes the second amateur to win golf's US Open. [1]
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- June 23
- New York Yankees get record 16 walks and three wild pitches, beating Philadelphia Athletics pitcher Bruno Hass, 15-0. [1]
- August 16
- Kansas City Packers' pitcher Alex Main no-hits Buffalo Blues (Federal League), 5-0. [1]
- August 31
- Chicago White Sox pitcher Jimmy Lavender no-hits New York Giants, 2-0. [1]
- September 7
- Saint Louis Terriers' Dave Davenport no-hits Chicago Whales (Federal League), 3-0. [1]
- September 18
- Boston Braves trounce Saint Louis Cardinals 20-1. [1]
- September 29
- Philadelphia Phillies clinch their first pennant. [1]
- October 9
- Woodrow Wilson becomes first US president to attend a World Series game (World Series #12). [1]
- October 13
- Boston Red Sox beat Philadelphia Phillies, four games to one in 12th World Series. [1]
- October 23
- First national horseshoe throwing championship (Kellerton, Iowa, USA). [1]
- December 14
- Jack Johnson becomes world heavyweight boxing champion. [1]
- December 22
- Organized baseball and Federal League sign a peace treaty at Cincinnati, Ohio. [1]
- Federal Baseball League is dissolved. [1]
1916
- January 1
- First football game in Rose Bowl (Washington State versus Brown University). [1]
- January 17
- First PGA Championship: Jim Barnes at Siwanoy Country Club, Bronxville, New York; Professional Golfer Association (PGA) forms. [1]
- February 8
- American baseball's National League votes down Charlie Ebbets proposal to limit 25-cent seats. [1]
- February 9
- American baseball's National League votes down a proposal by New York Giants, Boston Braves, and Chicago Cubs to increase club player limit from 21 to 22 (The Cincinnati Reds wanted to decrease to 20). [1]
- February 15
- New York Yankees buy Frank Baker AKA Home Run Baker from the Philadelphia Athletics for US$37,500. [1]
- March 25
- Heavyweight Jess Willard and Franc Moran fight to no decision in 10 rounds for boxing title (New York City, New York). [1]
- March 30
- Stanley Cup: Montreal Canadiens (NHA) beat Portland Rosebuds (PCHA), 3 games to 2. [1]
- April 1
- First US national women's swimming championships held. [1]
- April 10
- First professional golf tournament held. [1]
- April 19
- 20th Boston Marathon won by Arthur Roth of Massachusetts in 2:27:16.4. [1]
- April 20
- First National League game at Weeghman Park (Wrigley Field) in Chicago opens, Chicago Cubs beat Cincinnati Reds 7-6. [1]
- May 13
- 42nd Kentucky Derby: Johnny Loftus aboard George Smith wins in 2:04. [1]
- May 16
- 41st Preakness: Linus McAtee aboard Damrosch wins in 1:54.8. [1]
- June 16
- Boston Braves' pitcher Tom Hughes scores second no-hitter beating Pittsburgh Pirates 2-0. [1]
- June 18
- New York Yankees score in every inning but 8th beating Cleveland Indians 19-3. [1]
- June 21
- Boston Red Sox pitcher Rube Forster no-hits New York Yankees, 2-0. [1]
- June 26
- Cleveland Indians experiment with numbers on their baseball jerseys (one game). [1]
- June 30
- Chick Evans Junior wins golf's US Open. [1]
- July 14
- Saint Louis Browns' Ernie Koob pitches all 17 innings in a 0-0 tie versus Boston Red Sox. [1]
- August 26
- Philadelphia Athletics' pitcher Joe Bush no-hits Cleveland Indians, 5-0. [1]
- New York Yankees turn triple-play beating Saint Louis Browns 10-6. [1]
- August 30
- Boston Red Sox' Dutch Leonard no-hits Saint Louis Browns, 4-0. [1]
- September 30
- New York Giants lose to Braves 8-3, ends 26 consecutive win streak. [1]
- October 2
- Grover Cleveland Alexander records his 16th shutout of the year. [1]
- October 7
- In Lebanon, Tennessee, Georgia Tech defeats Cumberland University 222-0 in the most lopsided victory in American college football. [1] [5]
- October 9
- Babe Ruth pitches and wins longest World Series game (14 innings) 2-1. [1]
- October 12
- Boston Red Sox beat Brooklyn Dodgers, four games to one in 13th World Series. [1]
1917
- January 27
- Coen de Koning wins second official 11-city race (9:53) (record). [1]
- February 24
- Boston Red Sox sell Smokey Joe Wood, his pitching arm dead at age 26, to Cleveland Indians for $15,000. [1]
- March 11
- First NHL championship game ever played, Toronto Arenas beats Montreal Canadiens 7-3 in first of two-game set. [1]
- March 17
- First exclusively women's bowling tournament begins in Saint Louis, Missouri. [1]
- March 26
- Stanley Cup: Seattle Metropolitans (PCHA) beat Montreal Canadiens (NHL), 3 games to 1; Seattle is first US team to win Stanley Cup. [1]
- April 11
- Babe Ruth beats New York Yankees, pitching 3-hit 10-3 win for Boston Red Sox. [1]
- April 14
- Chicago White Sox pitcher Ed Cicotte no-hits Saint Louis Browns, 11-0. [1]
- April 19
- 21st Boston Marathon won by Bill Kennedy of New York in 2:28:37.2. [1]
- April 24
- New York Yankees' left-handed pitcher George Mogridge no-hits Boston Red Sox 2-1 at Fenway Park. [1]
- May 2
- Cincinnati Reds' Fred Tooney and Chicago White Sox' Hippo Vaughn pitch duel no-hitter, Vaughn gives up two hits and a run in the 10th, so Cincinnati wins 1-0. [1]
- May 5
- 42nd Preakness: E Haynes aboard Kalitan wins in 1:54.4. [1]
- Saint Louis Browns' Ernie Koob no-hits Chicago White Sox, 1-0. [1]
- May 6
- Saint Louis Browns' Bob Groom no-hits Chicago White Sox, 3-0. [1]
- May 7
- Boston Red Sox' Babe Ruth beats Washington Senators' Walter Johnson, 1-0. [1]
- May 12
- 43rd Kentucky Derby: Charles Borel on Omar Khayyam wins in 2:04.6. [1]
- June 23
- Molla Bjurstedt wins the US Lawn Tennis Association title. [1]
- July 1
- Cincinnati Reds' Fred Toney pitches complete doubleheader victories over Pittsburgh Pirates. [1]
- August 13
- Philadelphia Phillies steal five bases in an inning against the Boston Braves. [1]
- August 19
- Sunday benefit baseball game at the Polo Grounds results in John McGraw and Christy Mathewson's arrest for violating Blue laws. [1]
- August 22
- Pittsburgh Pirates play fourth straight extra inning game, Carson Bigbee sets record of 11 at-bats, they lose in 22 innings to Brooklyn Dodgers. [1]
- September 3
- Grover Cleveland Alexander pitches complete wins in a doubleheader. [1]
- October 15
- Chicago White Sox beat New York Giants, four games to two in 14th World Series. [1]
- November 22
- National Hockey League (NHL) is founded with Montreal Canadiens, Montreal Maroons, TorontArenas, Ottawa Senators, and Quebec Bulldogs. [1]
- National Hockey Association disbands. [1]
- December 19
- First NHL game played on artificial ice (Toronto, Ontario, Canada). [1]
- Québec Bulldogs play their first professional hockey game. [1]
- December 26
- First NHL defensemen to score a goal: Toronto Maple Leafs' Harry Cameron. [1]
1918
- January 2
- NHL Montréal Wanderers disband after Westmount arena burns down. [1]
- January 12
- Montreal Canadiens' Joe Malone scores five goals beating Ottawa Senators 9-4. [1]
- February 26
- Stands at Hong Kong Jockey Club collapse and burn, killing 604. [1] [187.219]
- March 2
- New York Yankees purchase 1st baseman George Burns from Detroit Tigers and immediately trades him to Philadelphia Athletics. [1]
- March 13
- First NHL Championship: Montreal Canadiens beat Toronto Arenas, outscoring them 10-7 in a two game set. [1]
- March 17
- US Ladies' Figure Skating Championship won by Rosemary Beresford. [1]
- US Men's Figure Skating Championship won by Nathaniel Niles. [1]
- March 30
- Stanley Cup: Toronto Arenas (NHL) beat Vancouver Millionaires (PCHA), 3 games to 2. [1]
- April 18
- Cleveland Indians' center fielder Tris Speaker turns an unassisted double play. [1]
- April 27
- Brooklyn Dodgers get first victory after worst major league start (0-9). [1]
- April 29
- Tris Speaker ties career outfield record of four unassisted double plays. [1]
- May 4
- New York Yankees set record with 8 sacrifices, beat Boston Red Sox's Babe Ruth 5-4. [1]
- May 11
- 44th Kentucky Derby: William Knapp on Exterminator wins in 2:10.8. [1]
- May 14
- Cleveland Indians' Stan Coveleski sets club record for most innings pitched (19). [1]
- Sunday baseball is made legal in Washington DC. [1]
- May 15
- 43rd Preakness (1st Division): Johnny Loftus aboard War Cloud wins in 1:53.6. [1]
- 44th Preakness (2nd Division): Charles Peak aboard Jack Hare Junior wins in 1:53.4. [1]
- Washington Senators' Walter Johnson pitches 1-0, 18-inning game. [1]
- May 19
- Washington D.C.'s first Sunday game, Washington Senators beat Cleveland Indians 1-0 in 18 innings. [1]
- May 24
- Cleveland Indians beat New York Yankees 3-2 in 19 innings. [1]
- June 1
- New York Yankees turn triple-play, beat Detroit Tigers 5-4. [1]
- June 13
- Philadelphia Phillies and Saint Louis Cardinals tie 8-8 in 19 innings. [1]
- June 15
- 50th running of Belmont Stakes (Johren wins). [1]
- July 17
- Longest errorless Major League baseball game, Chicago Cubs beat Philadelphia Phillies 2-1 in 21 innings. [1]
- August 1
- Pittsburgh Pirates beat Boston Braves, 2-0, in 21 innings. [1]
- August 17
- Samuel Riddle buys Man O' War race horse for $5,000. [1]
- September 1
- Baseball season ends due to world war. [1]
- September 5
- Due to the Great War, 15th World Series begins a month early. [1]
- September 11
- Boston Red Sox beat Chicago Cubs, four games to two in 15th World Series. [1]
- October 18
- NHL's Québec Bulldogs team is sold to Toronto, Ontario, businessman P J Quinn. [1]
- December 10
- John A Heyder becomes president of baseball's National League. [1]
- December 16
- Jack Dempsey knocks out Carl Morris in 14 seconds. [1]
- December 21
- Boston Red Sox trade Dutch Leonard, Ernie Shore and Duffy Lewis to New York Yankees for Ray Caldwell and Slim Love, Frank Gilhooey, Al Walters and $15,000. [1]
- December 26
- First day of first-class cricket in Australia after WWI (Victoria versus New South Wales). [1]
- December 31
- Kid Gleason replaces Pants Rowland as Chicago White Sox manager. [1]
1919
- January 14
- John McGraw, Charles A Stoneham, and Judge McQuade buy the New York Giants. [1]
- January 30
- Cincinnati Reds hires Pat Moran as manager as Christy Mathewson, is still in France with US Army. [1]
- February 1
- Brooklyn Dodgers trade Jake Daubert to Cincinnati Reds for Tommy Griffith Daubert. [1]
- February 5
- National League president John Heydler dismisses charges that Hal Chase bet against his team and threw games in collusion with gamblers. [1]
- February 18
- Cy Denneny of NHL Ottawa Senators scores record 52nd goal. [1]
- March 6
- NHL Championship: Montreal Canadiens beat Ottawa Senators, three games to one with one tie. [1]
- March 29
- Stanley Cup: Montréal (NHL) and Seattle (PCHA) win two games each with one tie; 1919 Stanley Cup not awarded due to flu epidemic. [1]
- April 5
- Heavyweight Jess Willard knocks out Jack Johnson in Havana, Cuba. [1]
- April 19
- 23rd Boston Marathon won by Carl Linder of Massachusetts in 2:29:13.4. [1]
- April 23
- US Baseball Major Leagues open a reduced 140-game season. [1]
- April 30
- Philadelphia Phillies beat Brooklyn Dodgers 9-0 in 20 innings. [1]
- May 4
- First legal Sunday baseball game in New York City (Philadelphia Phillies beat New York Giants 4-3). [1]
- May 10
- 45th Kentucky Derby: Johnny Loftus aboard Sir Barton wins in 2:09.8. [1]
- May 11
- Cincinnati Reds' pitcher Hod Eller no-hits Saint Louis Cardinals, 6-0. [1]
- New York Yankees' Jack Quinn and Washington Senators' Walter Johnson, play to 12 inning 0-0 tie. [1]
- May 12
- New York Yankees and Washington Senators play second straight extra inning tie, 4-4 in 15 innings. [1]
- May 14
- 45th Preakness: Johnny Loftus aboard Sir Barton wins in 1:53. [1]
- May 15
- Brooklyn Dodgers score ten runs in 13th inning to beat Cincinnati Reds 10-0. [1]
- June 6
- Man O' War wins first victory as a 2-year-old at Belmont. [1]
- June 11
- Sir Barton becomes first horse to win the Triple Crown. [1]
- June 28
- Carl Mazes pitches a complete double-header against New York Yankees. [1]
- July 4
- Jack Dempsey beats Jess Willard in 4th round in Cuba for heavyweight boxing championship. [1] [1302.93]
- July 17
- New York Yankees get 21 hits, Saint Louis Browns get 17 hits; Browns win 7-6 in 17 innings, on squeeze play. [1]
- August 11
- Green Bay Packers football club is founded. [1]
- August 13
- Man O' War's only defeat (Upset wins at Saratoga). [1]
- August 14
- New York Yankees' Muddy Ruel hits into a triple-play. [1]
- September 10
- Cleveland Indians' Ray Caldwell no-hits New York Yankees 3-0. [1]
- September 24
- Babe Ruth sets season homer mark at age 28 off of New York Yankees' player Bob Shawkey. [1]
- September 27
- Pitcher Bob Shawkey sets New York Yankees' record with 15 strike-outs. [1]
- September 28
- Fastest Major League Baseball game (51 minutes), New York Giants beat Philadelphia Phillies 6-1. [1]
- October 1
- World Series #16 begins as a best of 9 affair, Chicago White Sox intentionally throw this series to satisfy gamblers (The Black Sox Scandal). [1]
- October 19
- Cincinnati Reds beat Chicago White Sox, five games to three in 16th World Series. This series is known as the black sox scandal as seven White Sox players throw the series. [1]
- October 30
- Baseball league presidents call for abolishment of the spitball. [1]
- December 10
- National League votes to ban the spitball's use by all new pitchers. [1]
- New York, Boston, and Chicago oppose American League resolution accusing Ban Johnson of overstepping his duties. [1]
- December 26
- New York Yankees and Boston Red Sox reach agreement on transfer of Babe Ruth. [1] [5]
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