Defending champion Kim Clijsters and third seed Victoria Azarenka will meet in the semi-finals of the Australian Open.
Clijsters ousted Caroline Wozniacki – who now loses her No.1 ranking – 6-3 7-6 (7-4) to win their quarter-final clash.
Earlier, Azarenka outlasted Poland’s Agnieszka Radwanska in three sets to win 6-7 (0-7) 6-0 6-2.