- April 19
- Sandra Haynie wins LPGA Raleigh Ladies Golf Invitational. [1]
- April 20
- 74th Boston Marathon won by Ron Hill of Great Britain in 2:10:30 (new US marathon record). [1]
- April 21
- Sportscaster Curt Gowdy receives the George Foster Peabody Award for achievement in radio and television, the first sports broadcaster to receive the honor. [457]
- April 22
- New York Mets' Jerry Grote sets record of 20 put-outs by a catcher. [1]
- New York Mets' Tom Seaver consecutively strikes out ten San Diego Padres, for a total of 19. [1]
- Washington Senators beat New York Yankees 2-1 in 18 innings. [1]
- April 30
- Chicago Cubs' Billy Williams is first National League player to play in 1,000 consecutive games. [1]
- May 2
- 96th Kentucky Derby: Mike Manganello on Dust Commander wins 2:03.4. [1]
- May 3
- 24th NBA Championship: New York Knicks beat Los Angeles Lakers, 4 games to 3. [1]
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- Sandra Haynie wins LPGA Shreveport Kiwanis Golf Invitational. [1]
- May 8
- NBA championship: New York Knicks beat Los Angeles Lakers, 113-99. [1]
- May 10
- Betsy Rawls wins LPGA Dallas Civitan Golf Open. [1]
- Atlanta Braves' Hoyt Wilhelm pitches in his 1,000th game, loses to Saint Louis Cardinals 6-5. [1]
- Stanley Cup: Boston Bruins sweep Saint Louis Blues in four games. [1]
- May 12
- Ernie Banks hits his 500th home run. [1]
- May 15
- South Africa excluded from Olympic play. [1]
- May 16
- 96th Preakness: Eddie Belmonte aboard Personality wins in 1:56.2. [1]
- May 17
- Hank Aaron becomes 9th player to get 3,000 hits. [1]
- Shirley Englehorn wins LPGA Johnny Londoff Chevrolet Golf Tournament. [1]
- May 22
- Mel Stottlemyre sets record by walking 11, but wins 2-0. [1]
- May 23
- San Diego Padres beat San Francisco Giants 17-16 in 15 innings. [1]
- May 24
- Donna Caponi Young wins LPGA Bluegrass Golf Invitational. [1]
- May 25
- Third ABA Championship: Indiana Pacers beat Los Angeles Stars, 4 games to 2. [1]
- May 31
- Shirley Englehorn wins LPGA O'Sullivan Ladies' Golf Open. [1]
- June 7
- Jockey Willie Shoemaker passes Johnny Longden with his 6,033rd win. [1]
- June 12
- Pittsburgh Pirates' player Dock Ellis no-hits San Diego Padres, 2-0. [1]
- June 14
- Cincinnati Red Stockings loses first game after winning 130 straight. [1]
- June 20
- Baltimore Orioles' Brooks Robinson get his 2,000 career hit, a three run home run. [1]
- June 21
- Brazil wins last Jules Rimet Trophy soccer championship. [1]
- June 24
- Bobby Murcer ties record of four consecutive home runs. [1]
- June 26
- Frank Robinson hits two grand slams as Baltimore Orioles beat Washington Senators 12-2. [1]
- June 30
- First baseball game at Cincinnati's Riverfront Stadium. [1]
- Brazil beats Italy 4-1 in soccer's 9th World Cup at Mexico City. [1]
- July 3
- California Angels' Clyde Wright no-hits Oakland Athletics, 8-0. [1]
- July 8
- San Francisco Giants' Jim Ray Hart is 8th to get six RBIs in an inning (5th). [1]
- July 14
- National League wins 8th straight All Star Game, 5-4 in 12 innings (Riverfront, Cincinnati). [1]
- July 15
- Denmark beats Italy 2-0 in first world female soccer championship. [1]
- July 16
- Pittsburgh Pirates replaces Forbes Field with Three River Stadium. [1]
- July 18
- Ron Hunt gets hit by a pitch for a record 119th time. [1]
- Willie Mays hits number 3,000. [1]
- July 20
- Los Angeles Angels' Bill Singer no-hits Philadelphia Phillies, 5-0. [1]
- August 1
- Willie Stargell (Pittsburgh Pirates) ties record of five extra base hits in a game. [1]
- August 3
- Four-day NFL strike ends. [1]
- August 8
- New York Yankees honor Casey Stengel, retiring his number 37. [1]
- August 11
- Jim Bunning becomes second (Cy Young) to win 100 games in both leagues. [1]
- Tony Perez becomes the first to hit a home run in the red seats at Riverfront. [1]
- August 28
- Philadelphia Phillies' Larry Bowa steals home for second time in 1970. [1]
- August 31
- US defeats German Federal Republic for tennis' Davis Cup. [1]
- September 3
- Billy Williams ends longest National League consecutive streak at 1,117 games. [1]
- September 21
- ABC-TV debuts Monday Night Football, with Howard Cosell, Don Meredith and Keith Jackson. The Cleveland Browns beat the New York Jets 31-21. [457]
- Oakland Athletics' Vida Blue no-hits Minnesota Twins, 6-0. [1]
- September 27
- Ken Boswell sets second baseman record of 85 games without an error. [1]
- September 28
- Intrepid (US) beats Gretel II (Australia) in 22nd America's Cup. [1]
- October 1
- The Philadelphia Phillies beat the Montreal Expos in final game to be played at Connie Mack Stadium in Philadelphia, 2-1. After the game, fans swarm onto the field and destroy it. [1] [56]
- October 2
- Billy Martin named manager of the Detroit Tigers. [1]
- Plane carrying Wichita State University football team crashes killing 30. [1]
- October 3
- Baseball umpires call their first strike. [1]
- October 4
- Jan Stenerud of Kansas City Chiefs kicks 55-yard field goal. [1]
- October 14
- Cleveland Cavaliers lose to Buffalo Braves in their first game 107-92. [1]
- October 15
- Baltimore Orioles beat Cincinnati Reds, four games to one in 67th World Series. [1]
- October 28
- NBA Cleveland Cavaliers first home game, lose to San Diego Rockets 110-99. [1]
- November 1
- First regular season San Francisco Giants-New York Jets game, Giants win 22-10 at Shea Stadium. [1]
- November 2
- Cleveland Cavaliers lose by biggest margin-54 points (Philadelphia 76ers 141-87). [1]
- November 8
- Tom Dempsey of New Orleans Saints kicks NFL record 63-yard field goal. [1]
- November 12
- Cleveland Cavaliers' first NBA victory (11th game), beating Portland Trail Blazers 105-103. [1]
- November 14
- Marshall University football team wiped out in air crash at Kenova West, Virginia. [1]
- November 21
- New York Knicks' first game against Cleveland Cavaliers, Knicks win 102-94 at Madison Square Gardens, New York. [1]
- November 24
- Stanford's quarterback Jim Plunkett wins Heisman Trophy. [1]
- December 1
- NHL takes control of the Pittsburgh Penguins. [1]
- December 5
- Los Angeles Rams' Willie Ellison sets NFL record of 247 yards rushing. [1]
- Stanley Cup, Conn Smythe Trophy, and Bill Masterson trophy stolen from NHL hall of fame. [1]
- December 6
- Cleveland Cavaliers' first NBA home victory, beating Buffalo Braves 108-106. [1]
- December 10
- North American Soccer League awards New York and Toronto franchises. [1]
- December 11
- Start of the first Test match at the WACA, versus England. [1]
- Test Cricket debut of Gregory Stephen Chappell. [1]
- December 13
- Greg Chappell scores 108 on Test debut versus England at the WACA. [1]
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