Third-seeded Samantha Stosur advanced to the quarterfinals of the Strasbourg International with a walkover after opponent Lesia Tsurenko withdrew with a back injury on Tuesday.

Stosur, a former finalist at the French Open, will next play Ajla Tomljanovic, who defeated Shelby Rogers 7-6 (6), 3-6, 6-2.

Also, Sloane Stephens lost only five points on her first serve to join them in the quarterfinals with a 6-3, 6-4 win over sixth-seeded Coco Vandeweghe in an all-American match at the clay-court tournament.

Next up for Stephens will be either second-seeded Jelena Jankovic or Zheng Saisai.