A crucial moment arrived more than 2 1/2 hours into Novak Djokovic’s 4-6, 6-3, 6-2, 6-4 French Open quarterfinal victory over Alexander Zverev. It was the fourth set, and Djokovic led, but Zverev was in possession of a break point and a chance to get back into Wednesday’s match.

Novak Djokovic and Alexander Zverev are bugging out during their French Open quarterfinal. Both players have been bothered by little flies that are zooming around Court Philippe-Chatrier as they compete Wednesday night.