Former French Open champion Stan Wawrinka has dispatched a Ukrainian challenge from Alexandr Dolgopolov, earning a 6-4 7-6 (7-5) 7-5 victory to move into the third round at Roland Garros.

The 2015 winner levelled his record against the eastern European to 2-2 after beating Dolgopolov for the second time at a grand slam.

The 34-year-old Wawrinka won his 34th match on the Paris clay and stands 22-8 on the season. He came to the French Open after claiming the Geneva title.

Croatian seventh seed Marin Cilic defeated young Russian Konstantin Kravchuk 6-3 6-2 6-2.

“I’m taking it step by step, definitely my big focus, is to keep going with my game,” Cilic said. “That’s my only priority. How far I can go? I don’t know. It’s not up to me only.

“I’m very satisfied with the way I’m playing. My last two matches were really good quality tennis.”

Japanese eighth seed Kei Nishikori needed a visit from the trainer and a third-set chest massage on his way to eliminating Frenchman Jeremy Chardy 6-3 6-0 7-6 (7-5).

Asia’s top player next faces Korea’s Chung Hyeon, a winner over Denis Istomin 6-1 7-5 6-1.

Nishikori, a 2015 quarter-finalist at Roland Garros, won a dozen gams on the trot to move from 3-3 in the opening set to a 3-0 lead in the third, the moment he called for the trainer.

Russian Karen Khachanov upset Czech 13th seed Tomas Berdych 7-5 6-4 6-4.

Feliciano Lopez won a Spanish showdown over David Ferrer 7-5 3-6 7-5 4-6 6-4 while Argentine Juan Martin del Potro advanced when Nicolas Almagro retired at 6-3 3-6 1-1 with a knee injury.

American John Isner upset the clay formbook by beating Paolo Lorenzi 6-3 7-6 (7-3) 7-6 (7-2).