Romanian Sorana Cirstea, the No 18 seed, reached the last 16 of the Roland Garros by winning against Argentinian Solana Sierra 6-0, 6-0 on Friday.
Cirstea, ranked No 18, will play Chinese Xiyu Wang next.
The 36-year-old Romanian beat German Eva Lys (6-3, 6-0) and Frenchwoman Ksenia Efremova (6-3, 6-1) ahead of her victory.
Earlier in the tournament, Sierra, ranked No 68, defeated Italian Jasmine Paolini, the No 13 seed (3-6, 6-4, 6-3) and Englishwoman Emma Raducanu (6-0, 7-6 (4)).
