Petra Kvitova cruised into the French Open quarter-finals on Monday with a 6-2, 6-4 win over China's Zhang Shuai.
Two-time Wimbledon champion Kvitova is through to the last eight at Roland Garros for just the second time. Her best run in Paris came when she reached the semi-finals in 2012.
Seventh seed Kvitova, who missed last year's tournament due to an arm injury, will next play German veteran Laura Siegemund.
"It's been really difficult. It was a tough one for sure," said Kvitova, who will climb back into the top 10 following her performance in Paris.
"She served very well and played very aggressive. I'm really happy I managed to win even if I didn't manage to serve it out at 5-2."
"When the roof is closed it's like being indoors and I really love to play," added Kvitova.
"I'm really glad to have found a way through the tournament so far."
French Open results at Roland Garros on Monday, the ninth day of the delayed 2020 championship (x denotes seeded player):
Women
Fourth round
Petra Kvitova (CZE x7) bt Zhang Shuai (CHN) 6-2, 6-4
Laura Siegemund (GER) bt Paula Badosa (ESP) 7-5, 6-2