A natural at the game, John McEnroe tennis skill relied on his adaptability, unpredictability, and speed on the court. Of course, McEnroe's other tennis advantage was his infamous temper and often boorish. At Wimbledon in July 1980, the world watched as one of tennis's greatest rivalries developed between McEnroe and Bjorn Borg. The highlight of the match took place in the 4th set, which went into a tiebreaker. It took 22 minutes and 34 points for McEnroe to finally win the set. But while Borg emerged victorious, the world saw that McEnroe had the endurance and mental toughness to be a top player. The rivals met again at the 1980 U.S. Open, where McEnroe emerged a 5 set winner.