1988 in sports describes the year's events in world sport.
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- January 12 – Former Pirates slugger Willie Stargell is the only player elected to the Baseball Hall of Fame. Stargell, leader of two world champions in Pittsburgh and NL co-MVP in 1979 at age 39, becomes the 17th player to be elected in his first year of eligibility. Jim Bunning falls four votes shy of the 321 needed for election in his 13th year on the ballot.
- August 8 – The first night game ever at Wrigley Field is played. After an attempt the previous night was rained out, the Cubs defeat the New York Mets 6–4.
- World Series – Los Angeles Dodgers won 4 games to 1 over the Oakland Athletics. The Series MVP was Orel Hershiser, Los Angeles
- Embassy World Professional Darts Championships won by Bob Anderson of England
Men's professional
Men's amateur
Women's professional
- 1988 Summer Olympics takes place in Seoul, South Korea
- USSR wins the most medals (132) and the most gold medals (55).
- September 24 – Canada's Ben Johnson wins Olympic gold in 100 metres. Two days later, he is stripped of the medal after testing positive for a banned substance.
- 1988 Winter Olympics takes place in Calgary, Canada
- USSR wins the most medals (29) and the most gold medals (11).