Top-seeded Caroline Wozniacki of Denmark overpowered Britain's Katie O'Brien 6-0, 6-1 on Thursday to advance to the quarterfinals of the Japan Women's Open.
Wozniacki converted six of nine break points in a match that lasted just 44 minutes at Utsubo Tennis Center.
The U.S. Open finalist will face Canada's Aleksandra Wozniak in the quarterfinals. Sixth-seeded Wozniak struggled past Taiwan's Chang Kai-chen 7-5, 7-6 (2).
American veteran Jill Craybas recovered from a shaky start for a 2-6, 6-2, 6-0 win over France's Mathilde Johansson.
Craybas will face third-seeded Australian Samantha Stosur, who defeated Japan's Akiko Morigami 6-1, 6-2.
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