World No. 1 Caroline Wozniacki crashed out of the Pan Pacific Open after a shock 7-5, 1-6, 6-4 loss to Estonian Kaia Kanepi on Wednesday.
Maria Sharapova, meanwhile, is looking for payback on Petra Kvitova after setting up a quarterfinal rematch against her Wimbledon final conqueror with a 7-6 (7-4), 7-6 (7-4) win over Germany's Julia Goerges.
Defending champion Wozniacki looked to have recovered after losing the opening set to world No. 43 Kanepi at Ariake Colosseum, racing through the second set in 36 minutes before jumping out to a 3-0 lead in the third.