John Patrick McEnroe, Jr. is a former World No. 1 professional tennis player from the United States. He won seven Grand Slam singles titles, nine Grand Slam men's doubles titles, and one Grand Slam mixed doubles title. McEnroe also won a record eight season ending championships, comprising five WCT Finals titles and three Masters Grand Prix titles from twelve final appearances at those two events, a record he shares with Ivan Lendl. Additionally, McEnroe is a former junior Grand Slam champion. During his career, McEnroe is listed to have won 77 singles titles by the ATP.
In 1984, McEnroe recorded the best single season win-loss record in the Open Era at 96.47%. In 1981, 1983 and 1984 McEnroe was the ITF World Champion for Men's singles. He was also named as the ATP player of the year in 1981, 1983 and 1984. McEnroe is widely regarded as one of the greatest tennis players of all time, especially for his touch on the volley.
He is best remembered for his shot-making artistry and superb volleying; for his famous rivalries with Björn Borg, Jimmy Connors and Ivan Lendl; and for his confrontational on-court behavior which frequently landed him in trouble with umpires and tennis authorities. McEnroe's most famous confrontations include his tirade at an umpire during a match at Wimbledon in 1981 and for being disqualified from the 1990 Australian Open.