Caroline Wozniacki of Denmark has upset two-time major champion Svetlana Kuznetsova of Russia at the U.S. Open to reach her first Grand Slam quarterfinal.

The No. 9-seeded Wozniacki came back to beat No. 6 Kuznetsova 2-6, 7-6 (5), 7-6 (3) Monday night.

Wozniacki will face 17-year-old American Melanie Oudin next. All four of the women left on their half of the draw will be playing in a major quarterfinal for the first time.

Kuznetsova won the 2004 U.S. Open and this year's French Open.