- July 16
- Don Mattingly hits his fourth grand slam of the season and ties American League record. [1]
- July 17
- New York Yankees' first baseman Don Mattingly becomes the first American League player to hit a home run in seven consecutive games. [56]
- July 18
- New York Yankees' Don Mattingly ties major league record (Dale Long, 1956) of home runs in eight consecutive games. [1] [56]
- July 20
- New York Yankees' Don Mattingly ties first base majors fielding record (Hal Chase, 1906) with 22 put-outs. [1] [56]
- July 22
- Said Aouita of Morroco sets the 5km record (12:58.39) in Rome, Italy. [1]
- July 23
- Petra Felke (German Democratic Republic) throws javelin 78.89 metres (women's record). [1]
- Said Aouita of Morocco runs world record 5,000 metres (12:58.39). [1]
- August 1
- Crossbow flight record (2,005 yards 1 foot 9 inches) set by Harry Drake in Nevada. [1]
- Mike Tyson beats Tony Tucker to become undisputed boxing champ. [1]
- August 2
- Cincinnati Reds' Eric Davis becomes 7th and earliest 30 home run 30 steal man. [1]
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- Don Brown sets flight record for handbow (1,336 yards 1 foot 3 inches). [1]
- Kevin Seitzer (Kansas City Royals), gets six hits in one baseball game. [1]
- Michael Andretti runs fastest Indy car race in history (171.49 MPH). [1]
- August 3
- Chicago Bears beat Dallas Cowboys 17-6 in London, England (NFL expo). [1]
- August 7
- Bill Mazeroski's uniform jersey #9 is officially retired from active service by the Pittsburgh Pirates. [56]
- August 8
- Milwaukee Brewers' Rob Deer struck-out five times in a game. [1]
- August 9
- Los Angeles Rams beat Dallas Cowboys 28-27 in London, England (NFL expo). [1]
- August 15
- US beats Cuba in the Pan-Am baseball. [1]
- August 16
- New York Mets beat Chicago Cubs, 23-9. [1]
- August 21
- "Mack Lobell" sets harness racing's trotting mile (1:52). [1]
- August 30
- Ben Johnson of Canada runs 100m in world record 9.83 seconds. [1]
- Stefka Kostadinova of Bulgaria sets high jump women's record (6 feet 10.25 inches). [1]
- Yves Pol of France runs complete marathon backwards (3:57:57). [1]
- August 31
- Curtis Strange sets golf's earning for the year record (US$697,385). [1]
- September 2
- Kevin Bass is first National League member to switch hit home runs in a game twice in one season. [1]
- September 6
- Saskatchewan Rough Riders' Dave Ridgway kicks a Canadian Football League record 60-yard field goal. [1]
- September 9
- Nolan Ryan strikes out his 4,500th batter. [1]
- September 12
- Vince Coleman steals his 100th base for third straight year. [1]
- September 14
- The Toronto Blue Jays beat the Baltimore Orioles 18-3; the Blue Jays set a major league record of ten home runs; Orioles' player Cal Ripken Junior sets record consecutive-innings streak of 8,243, spanning 904 games. [1] [56]
- September 18
- Detroit Tigers' Darrell Evans is first 40-year-old to hit 30 home runs. [1]
- September 20
- Alain Prost wins record 28th Formula one auto race. [1]
- Walter Payton scores NFL record 107th rushing touchdown. [1]
- September 22
- Second regular-season National Football League players' strike begins. [1]
- Boston Red Sox' Wade Boggs gets his 200th hit in five straight seasons. [1]
- September 29
- New York Yankees' Don Mattingly hits Major league record sixth grand slam of the year. [1] [56]
- October 3
- Michael Pruffer of France skis 135.26 MPH at Portillo, Chile. [1]
- October 4
- First "Scrub Sunday" of NFL football with replacement players. [1]
- Toronto Blues Jays lose final seven games of the season, allowing Detroit Tigers to win the American League pennant in four straight games. [1] [56]
- James Jefferson of Winnipeg Blue Bombers scores two touchdowns on interception returns without making an interception. (He scored on laterals). [1]
- October 12
- Minnesota Twins beat Detroit Tigers for American League pennant. [1]
- October 15
- NFL Players Association orders an end to the 24-day strike. [1]
- October 17
- First World Series game in a covered stadium (Minnesota Metrodome) (World Series #84). [1]
- October 19
- Billy Martin hired as manager of New York Yankees for fifth time. [1] [56]
- October 25
- Minnesota Twins win their first World Series championship beating Saint Louis Cardinals, 4 games to 3 in 84th World Series. [1] [56] [83]
- October 29
- Thomas Hearns wins unprecidented fourth different weight boxing title. [1]
- October 31
- First jockey to win nine races in one day (Chris Antley at Belmont). [1]
- A pair in Coventry, England ties the world record for the longest singles tennis match at 80 hours 21 minutes. [1]
- November 1
- 22,000 run in New York City Marathon (won by Ibrahim Hussein of Kenya 2:11:01). [1]
- New York Jets retire Don Maynards number 13. [1]
- New Orleans Saints shut out Atlanta Falcons 38-0. [1]
- November 4
- NBA announces four new franchises; Charlotte and Miami for 1988 and Minneapolis and Orlando for 1989. [1]
- November 22
- New England Patriots shutout Indianapolis Colts 24-0. [1]
- November 29
- New York Rangers' Bob Frosse becomes second goalie to score a goal (vs New York Islanders). It is later ruled that he should not be credited with the goal. [1]
- December 2
- "334" club forms as 334 brave New Jersey Devils' fans journey through 20 inches of snow to attend New Jersey Devils 7-5 victory over Calgary Flames at Meadowlands colliseum. [1]
- December 4
- Karlstad skates world record 10 km (13:48.51). [1]
- December 5
- 53rd Heisman Trophy Award: Tim Brown, Notre Dame (world record). [1]
- David Boon's 5th Test Cricket century, 143 versus New Zealand at Brisbane. [1]
- Schönbrunn skates world record 3 km ladies (4:16.76). [1]
- December 6
- Christa Rothenburger skates female world record 500 metre (39.39 seconds). [1]
- Jane Crafter/Steve Jones win LPGA J C Penney Golf Classic. [1]
- December 8
- Philadelphia Flyers' Ron Hextall becomes first goalie to actually score a goal. [1]
- December 9
- Larry Bird ends streak of 59 consecutive free throws. [1]
- December 11
- Test debut of Carl Hooper, West Indies versus India at Bombay. [1]
- December 12
- Mookie Blaylock sets NBA record of 13 steals in a game. [1]
- Oklahoma sets NCAA record of 33 steals versus Centenary. [1]
- Rollermania at Madison Square Garden, Eastern Express beats Midwest Pioneers. [1]
- December 13
- Cleveland Browns set club record for most points scored in a quarter, 28. [1]
- December 14
- Allan Border scores 205 versus New Zealand to become Australia's top rungetter. [1]
- December 19
- Boston Bruins' Ken Linseman and Saint Louis Blues' Doug Gilmore score goals, two seconds apart. [1]
- December 20
- 76th Davis Cup: Sweden beats India in Gothenburg (5-0). [1]
- Nancy Lopez/Miller Barber win LPGA Mazda Golf Championship. [1]
- December 27
- Steve Largent sets all-time NFL record for career catches when he catches his 752nd pass. [1]
- December 30
- Australia hangs on for draw versus New Zealand at Melbourne Cricket Ground, one wicket left 17 runs short. [1]
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