In which sport did John McEnroe become famous?

John Patrick McEnroe Jr. (born February 16, 1959) is an American former professional tennis player. He was known for his shot-making and volleying skills, in addition to confrontational on-court behavior that frequently landed him in trouble with umpires and tennis authorities.

McEnroe attained the world No. 1 ranking in both singles and doubles, finishing his career with 77 singles and 78 doubles titles; this remains the highest men's combined total of the Open Era. He thus remains the only male player to win more than 70 titles in both the men's singles and the men's doubles categories. He won seven Grand Slam singles titles (four at the US Open and three at Wimbledon), nine Grand Slam men's doubles titles (five at Wimbledon and four at the US Open), and one Grand Slam mixed doubles title (at the French Open). His singles match record of 82–3 in 1984 remains the best single season win rate of the Open Era.

He has stayed active in retirement, often competing in senior events on the ATP Champions Tour. He has also worked as a television commentator during the majors.