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. He won seven Grand Slam (also referred to as Majors) single titles, including four US Open titles and three Wimbledon titles, and added nine men's Grand Slam doubles titles. His singles match record of 82–3 in 1984 remains the best single season win rate of the Open Era.
McEnroe also excelled at the year-end tournaments, winning eight singles and seven doubles titles, both of which are records. Three of his winning singles year-end championships were at the Masters Grand Prix (the ATP year-end event) and five were at the World Championship Tennis (WCT) Finals, an event which ended in 1989. Since 2000, there has been only one year-end men's singles event, the ATP Finals (the new name for the Masters Grand Prix). He was named the ATP Player of the Year and the ITF World Champion three times each: 1981, 1983 and 1984.