Coco Gauff used her greater experience to fight back from a set down against 16-year-old Russian Mirra Andreeva to reach the French Open fourth round.
American sixth seed Gauff, who is still only 19, remained calm and turned the match around to win 6-7 (5-7) 6-1 6-1.
Andreeva, who turned 16 in April, was fortunate not to be defaulted after angrily swatting a ball into the crowd.
Poland's Iga Swiatek, who beat Gauff in last year's final, also progressed with a 6-0 6-0 win over China's Wang Xinyu.
Swiatek, going for a third Roland Garros title, needed just 51 minutes to record her first 'double bagel' at a Grand Slam.