Samantha Stosur has turned the tables on her horror record against fellow French Open runner-up Lucie Safarova to seal a fourth-round berth at Roland Garros.

Stosur, the 21st seed, battled for two hours and 22 minutes on centre court on Friday to secure the 6-3 6-7 (0-7) 7-5 victory – just her fourth against the 11th seed from 15 matches.

Stosur will turn her attention to a fourth-round clash on Sunday with Romanian sixth seed Simona Halep.