In the final set of the French Open match between Andy Murray and  Viktor Troicki a ball boy had his head out of the game for minute and went to chase down a ball that was still in play.

Troicki lost that point, but won that game. Murray came back to win the match 4-6, 4-6, 6-3, 6-2, 7-5.

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(H/T Deadspin)