Against Valentova, an 18-year-old who won the junior title at the French Open last year and was competing in the main draw at a major tournament for the first time, Gauff got broken five times. Four of those came in the second set — and each time, the 21-year-old Floridian managed to immediately rebound to claim Valentova’s very next service game.

Coco Gauff calls for the French Open to schedule women's tennis in night spots.

Coco Gauff shook off some shaky serving and Novak Djokovic overcame a bothersome blister to advance at the French Open.