Sara Errani of Italy showed her surprising run to last year's French Open final was no fluke, beating fourth-seeded Agnieszka Radwanska of Poland 6-4, 7-6 (6) Tuesday to reach the semifinals.
The fifth-seeded Errani will next face top-seeded Serena Williams.
Errani rallied from a 3-1 deficit in the second set to break for a 5-4 lead, but she then failed to serve out the match. However, she did not falter in the tiebreaker, converting her second match point when Radwanska hit a backhand wide.
Radwanska was the first Polish woman to reach the quarterfinals at Roland Garros in the Open era, which started in 1968.