Top seed Iga Swiatek says she does "not want to get lazy" after thrashing China's Wang Xinyu 6-0 6-0 to reach the French Open fourth round.
Poland's Swiatek, going for a third Roland Garros title, has won four of her six sets without dropping a game.
Coco Gauff used her greater experience to fight back from a set down against 16-year-old Russian Mirra Andreeva.
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.
Swiatek, who beat Gauff in last year's final on the Paris clay, needed just 51 minutes to record her first 'double bagel' at a Grand Slam.