Top-seeded Flavia Pennetta edged seventh-seeded Aravane Rezai of France 6-4, 6-4 in the quarter-finals.
Defending champion and fifth seed Sara Errani beat Yaroslava Shvedova of Kazakhstan 6-2, 7-5, while Tathiana Garbin routed Olga Govortsova of Belarus 6-2, 6-1.
Anna-Lena Groenefeld of Germany reached the final four when second-seeded Patty Schnyder retired with a left hip flexor strain while trailing 4-3.
In the semi-finals, Errani will play Groenefeld, while Garbin will face Pennetta.
RSS