NEW YORK, NY, USA - She won her first two rounds not playing her best, but it was third match unlucky for Jelena Jankovic, who lost at the US Open to Kaia Kanepi on a breezy Saturday afternoon in New York City.

Kanepi, the No.31 seed, seemed less troubled by the wind than the No.4-seeded Jankovic throughout the Arthur Ashe match-up, hitting through the conditions with her huge serve and even bigger groundies. The Estonian built a 62 53 lead and despite a late surge from Jankovic she was able to close the match out in a remarkable showing in the subsequent tie-break, 62 76(1).

"It was really hard to play in that wind, but she handled it a lot better than I did and she was the better player today, so congratulations to her," Jankovic said afterwards. "I didn't really have a chance to play my best tennis today and unfortunately now, I'm out of the tournament. But I'll keep working hard."

Later in the day, No.1 seed Caroline Wozniacki and No.14 seed Maria Sharapova set up an all-star fourth round clash with comfortable wins. Read more about Wozniacki and Sharapova's upcoming showdown here.

Next up for Kanepi will be No.15 seed Yanina Wickmayer, who won a nail-biter against Patty Schnyder out on the Grandstand, battling for over two and a half hours to win, 76(5) 36 76(6). Schnyder saved match point to push the match to a third set tie-break then held her own match point leading 6-5 there, but a huge inside out forehand saved that and she went on to close it out.

Other players snapping up berths in the second week were No.7 seed Vera Zvonareva, who held off a late surge from No.25 seed Alexandra Dulgheru, 62 76(2); Dominika Cibulkova, who rolled past Spanish qualifier Lourdes Domínguez Lino, 60 61; Andrea Petkovic, who advanced when Peng Shuai withdrew prior to their match with a right elbow injury; and in the night match, No.11 seed Svetlana Kuznetsova retook control of her head-against No.23 seed Maria Kirilenko with a 63 64 victory, having lost their last two meetings.