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.

The French Open ignites at Roland Garros with thrilling comebacks, crowd chaos and the Philippe-Chatrier night session debate.

The seventh-seeded, two-time finalist at Roland-Garros wins the first set but loses 13 of the 14 last games in a second-round loss to Nuno Borges.