Two-time Wimbledon champion Petra Kvitova reached the French Open quarterfinals for the first time in eight years by beating Zhang Shuai 6-2, 6-4.
The seventh-seeded Czech player lost her only semifinal match at Roland Garros in 2012.
Zhang had a medical timeout while trailing 5-2 in the first set.
Kvitova sat waiting wrapped in a pink coat to combat the chilly conditions on Court Philippe Chatrier. She then did some leg exercises to keep warm.
The 30-year-old Kvitova will next face Laura Siegemund. The unseeded German beat Paula Badosa 7-5, 6-2 to reach the quarterfinals at a major tournament for the first time.