Polish top seed Agnieszka Radwanska is the first player through to the women's semi-finals at the Sydney International.
Radwanska battled hard for a 6-4 7-5 quarter-final win over unseeded Italian Roberta Vinci in vastly different conditions than the baking 40-degree heat.
Runner-up to Serena Williams at Wimbledon last year, Radwanska found it tough going in the wind against Vinci, whose backhand slice also troubled the No.1 seed.
She eventually progressed in one hour and 34 minutes after recovering a service break down in the second set.
Radwanska will play Chinese sixth seed Li Na, the 2011 champion, or American qualifier Madison Keys on Thursday for a place in Friday's final.