John Patrick McEnroe Jr. (born February 16, 1959) is a retired American tennis player, often considered among the greatest in the history of the sport. He was known for his shot-making artistry and volleying skills, as well as his confrontational on-court behavior that frequently landed him in trouble with umpires and tennis authorities.

McEnroe attained the 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. At the majors he won seven singles titles (four US Open, three Wimbledon) and nine men's doubles titles. He also excelled at the year-end tournaments, winning eight singles and seven doubles titles, both of which are records.

Controversy was never far from McEnroe, however; in his fourth-round match against Mikael Pernfors at the 1990 Australian Open, McEnroe was ejected from the tournament for swearing at the umpire, supervisor, and referee. He was warned by the umpire for intimidating a lineswoman, and then docked a point for smashing a racket. McEnroe was apparently unaware that a new Code of Conduct, which had been introduced just before the tournament, meant that a third code violation would not lead to the deduction of a game but instead would result in immediate disqualification; therefore, when McEnroe unleashed a volley of abuse at umpire Gerry Armstrong, he was defaulted. He was fined $6,500 for the incidents.

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