TOKYO -- Top-seeded Dane Caroline Wozniacki and two- time 2010 Grand Slam finalist Vera Zvonareva of Russia were among Wednesday's third-round winners at the $2 million Toray Pan Pacific Open.
The former U.S. Open runner-up Wozniacki drilled 16th-seeded Russian Anastasia Pavlyuchenkova 6-1, 6-2, while the second-seeded Zvonareva blew past Italian qualifier Roberta Vinci 6-4, 6-0 on the hardcourts at Ariake Colosseum.
The surging Zvonareva was this year's runner-up at the U.S. Open and Wimbledon.
Wozniacki's quarterfinal opponent on Thursday will be sixth-seeded Pole Agnieszka Radwanska, while Zvonareva will face seventh-seeded fellow Russian Elena Dementieva. Radwanska routed German Andrea Petkovic 6-3, 6-3, while the 2006 Pan Pacific titlist Dementieva downed Italian Flavia Pennetta 6-4, 6-2.
A Day-4 upset came when Estonian Kaia Kanepi took out third-seeded 2009 Pan Pacific Open runner-up Jelena Jankovic 6-4, 6-4. The former world No. 1 Jankovic lost to Russian star Maria Sharapova in last year's marquee finale here. The rising Kanepi reached the quarterfinals at the U.S. Open and Wimbledon this past summer.
Kanepi's quarterfinal opponent will be fifth-seeded French Open champion Francesca Schiavone, who drove out 40-year-old Japanese crowd favorite Kimiko Date Krumm 6-3, 6-3. The age-defying wild card Date Krumm captured this event in 1995.
One other quarterfinal here will pit eighth-seeded Belarusian Victoria Azarenka against American qualifier Coco Vandeweghe. Azarenka was handling 11th-seeded former Wimbledon runner-up Marion Bartoli 6-2 when the Frenchwoman retired due to a viral illness, while Vandeweghe vaulted past German Julia Goerges 6-3, 6-0.
The 2010 Pan Pacific Open champ will earn $350,000.