Semifinals set in Sydney and Hobart

Serena Williams survived a serious quarterfinal challenge from Carolina Wozniacki in Sydney, and will now play Elena Dementieva, who won a three-setter against Agnieszka Radwanska. The other semifinal will feature Ai Sugiyama, the beneficiary of a walkover from Svetlana Kuznetsova (abdominal strain), and Dinara Safina, who defeated Alize Cornet.

In Hobart, Magdalena Rybarikova (who saved a match point to defeat Melinda Czink) will face Iveta Benesova, and Petra Kvitova will compete against Virginie Razzano.

Williams def. Wozniacki, 6-7, 6-3, 7-6
Dementieva def. Radwanska, 6-2, 5-7, 6-4
Safina def. Cornet, 6-3, 6-4

Rybarikova def. Czink, 6-0, 1-6, 7-6
Benesova def. Dulko, 6-4, 6-4
Kvitova def. Pavlyuchenkova, 1-6, 7-5, 6-3
Razzano def. Pironkova, 6-4, 6-1