John McEnroe won 7 Grand Slam singles titles (3 Wimbledon, 4 US Open) and held the world No. 1 ranking for 170 weeks. Famed for his serve-and-volley artistry and fiery on-court temperament, his rivalries with Bjorn Borg and Jimmy Connors defined men's tennis in the early 1980s; he later became one of the sport's most recognizable television commentators.