Sloane Stephens and Garbine Muguruza both progressed to French Open third round with victories on Wednesday.
American Stephens, last year's runner-up, beat Spanish world number 75 Sara Sorribes Tormo 6-1 7-6 (7-3).
Muguruza, who won the title in 2016, won 6-4 6-1 against 172-ranked Johanna Larsson of Sweden.
The Spaniard will play ninth seed Elina Svitolina in the third round after the Ukrainian received a walkover when compatriot Kateryna Kozlova pulled out.