Top seed Iga Swiatek overwhelmed another opponent with a rapid win to reach the French Open third round but Simona Halep was knocked out.
Poland's Swiatek, 20, needed 61 minutes to win 6-0 6-2 against American Alison Riske at Roland Garros.
Swiatek, who beat Ukraine's Lesia Tsurenko in 54 minutes on Tuesday, has now won her past 30 matches and is aiming for a sixth successive title.
But fellow former champion Halep lost 2-6 6-2 6-1 to teenager Zheng Qinwen.
Romania's Halep struggled physically in the second half of the match, seeming to have difficulties with her breathing and calling on the trainer, and faded badly against the unseeded 19-year-old Chinese player.