Swiss player Schnyder now plays Beth Mattek after the American qualifier upset third seed Jelena Jankovic.

In the other semi-final, fourth seed Daniela Hantuchova will play Akiko Morgami of Japan.

The Slovakian had to battle back to beat Yoon Jeong Cho of Korea 6-7 (1-7) 6-4 6-1 while Morigami beat Indian Sania Mirza 6-4 6-3.

Hantuchova's victory brought to an end a run of 10 tournaments without reaching a semi-final.

Unseeded Morigami, who upset second seed Vera Zvonareva in the previous round, continued her good run of form.

And her quarter-final victory avenged her defeat to Mirza in the first round at Wimbledon.