John Patrick McEnroe Jr. (born February 16, 1959) is an American former World No. 1 professional tennis player, often rated among the greatest players of all time in the sport, especially for his touch on the volley. He won seven Grand Slam singles titles (three at Wimbledon and four at the US Open), nine Grand Slam men's doubles titles, and one Grand Slam mixed doubles title. He also won a record eight year-end championships, 19 Grand Prix Super Series titles, and finished his career with 77 ATP-listed singles titles and 78 in doubles.

McEnroe was fined U.S. $1,500 and came close to being thrown out after he called umpire Ted James "the pits of the world" and then swore at tournament referee Fred Hoyles. He also made famous the phrase "you cannot be serious", which years later became the title of McEnroe's autobiography, by shouting it after several umpires' calls during his matches. This behavior was in sharp contrast to that of Bjorn Borg, who was painted by the press as an unflappable "Ice Man." Nevertheless, in matches played between the two, McEnroe never lost his temper.

"You Cannot Be Serious" made it to the top of the New York Times bestseller list. The hardcover edition was published by G.P. Putnam's Sons in 2002, with the paperback being released a year later by The Berkley Publishing Group in the USA, and by Time Warner in the UK.

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