Justine Henin-Hardenne was given a major scare before scraping past Anabel Medina Garrigues in round three of the French Open on Saturday.
The tournament favourite lost the first five games before fighting back to win 4-6 6-2 6-3.
Second seed Maria Sharapova earlier eased past fellow Russian Anna Chakvetadze to make the fourth round.
Fellow Russians Svetlana Kuznetsova, Nadia Petrova and Elena Bovina also made progress on Saturday morning.
Sharapova has not been at her best on the Paris clay but had little trouble with Chakvetadze, winning 6-1 6-4.
The Wimbledon champion will play Nuria Llagostera Vives in the last 16 after the Spaniard beat 13th seed Nathalie Dechy 7-6 (7-1) 6-3.
"I got off to a really good start, and I was in control from the first game," said world number two Sharapova.
"As the rounds go on, it's going to be a lot tougher than it is right now, so I have to raise my level another notch."
Sixth seed Kuznetsova recovered from an alarming mid-match wobble to beat American Marissa Irvin 6-1 2-6 6-0 and set up a clash with Henin-Hardenne.
Petrova, seeded seventh, beat Shahar Peer 6-3 6-1, and 12th seed Bovina ended the hopes of local favourite Tatiana Golovin 6-3 7-5.
"It's a pity because I had a chance there," said Golovin. "It's sad to lose that way, particularly when you have the support of the crowd."
Another Frenchwoman, Emilie Loit, went down 4-6 6-3 6-3 to Switzerland's Emmanuelle Gagliardi in a match held over from Friday.
Henin-Hardenne paid tribute to Garrigues after her battling performance.
"I had a lot of difficulties at the beginning, but that's because my opponent was so good," said the Belgian.
"This was one of my best matches in recent times. She didn't give away anything.
"This type of match is very satisfying, because you really need to go for it."