John McEnroe was in his prime in 1984 (he would go 82-3), but even he couldn't prevent a momentous collapse against Ivan Lendl in the French Open. After jumping out to a swift lead, two sets to none, McEnroe's temper took over as the Czech star dramatically fought back to win in five sets. Ultimately, McEnroe's 39-match winning streak was snapped, and a French Open victory would never be so close.
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