PARIS — Novak Djokovic and Alexander Zverev were bugging out during their French Open quarterfinal Wednesday night, bothered by little flies that zoomed around Court Philippe-Chatrier as they competed. At one point, Zverev leaned over, put his hand on his knee and had a bit of a coughing fit, apparently after one of the bugs flew into his mouth.

Novak Djokovic cleared a major hurdle in pursuit of a fourth Roland-Garros title, defeating No. 3 Alexander Zverev 4-6, 6-3, 6-2, 6-4 in the quarterfinals on Wednesday in Paris.