<p> British teen Laura Robson stunned Chinese ninth seed Li Na at the US Open here at the Flushing Meadows to book a fourth round showdown against defending champion Samantha Stosur.<br /><br /></p>.<p>The 18-year-old left-hander took her first victory over a top-10 opponent by beating 2011 French Open winner Li Na 6-4, 6-7 (5), 6-2 Friday, reports Xinhua.<br /><br />Australian seventh-seed Stosur, who has not won a title since lifting the US Open trophy last year, reached the fourth round with a 7-6 (5), 6-2 victory over American 31st seed Varvara Lepchenko.<br /><br />"She's already had two very good wins and she's full of confidence," Stosur said.<br />"I have to be ready to play my best game if I'm going to beat her. It can be a very tricky match. She's got nothing to lose and she has had two of the biggest wins of her career."<br />Robson, who was born in Australia but moved to Britain at age six, became the first British woman in the fourth round of a Grand Slam since Sam Smith at Wimbledon in 1998 and the first in U.S. Open's last 16 since Jo Durie in 1991.<br /><br />Uzbek-born Lepchenko, who became a US citizen a year ago, has still never beaten a top-10 player. She was trying to match her best Grand Slam result, this year's fourth-round French Open run.<br /><br />After fighting to 5-5 in the tie-breaker, Lepchenko sent a lob and a backhand wide to surrender the opening set after 59 minutes. Stosur broke in the third and fifth games of the second set and held to finish in 88 minutes.<br /><br />French 11th seed Marion Bartoli also advanced with a 6-2, 6-4 victory over compatriot Kristina Mladenovic, setting up a last 16 match against fifth-seeded Czech Petra Kvitova, who defeated Pauline Parmentier of France 6-4, 6-4 to reach the fourth round.<br /><br />Third-seeded Russian Maria Sharapova, the reigning French Open champion, meets US wildcard Mallory Burdette and Belarus top seed Victoria Azarenka, the reigning Australian Open champion, plays China's Zheng Jie later.</p>
<p> British teen Laura Robson stunned Chinese ninth seed Li Na at the US Open here at the Flushing Meadows to book a fourth round showdown against defending champion Samantha Stosur.<br /><br /></p>.<p>The 18-year-old left-hander took her first victory over a top-10 opponent by beating 2011 French Open winner Li Na 6-4, 6-7 (5), 6-2 Friday, reports Xinhua.<br /><br />Australian seventh-seed Stosur, who has not won a title since lifting the US Open trophy last year, reached the fourth round with a 7-6 (5), 6-2 victory over American 31st seed Varvara Lepchenko.<br /><br />"She's already had two very good wins and she's full of confidence," Stosur said.<br />"I have to be ready to play my best game if I'm going to beat her. It can be a very tricky match. She's got nothing to lose and she has had two of the biggest wins of her career."<br />Robson, who was born in Australia but moved to Britain at age six, became the first British woman in the fourth round of a Grand Slam since Sam Smith at Wimbledon in 1998 and the first in U.S. Open's last 16 since Jo Durie in 1991.<br /><br />Uzbek-born Lepchenko, who became a US citizen a year ago, has still never beaten a top-10 player. She was trying to match her best Grand Slam result, this year's fourth-round French Open run.<br /><br />After fighting to 5-5 in the tie-breaker, Lepchenko sent a lob and a backhand wide to surrender the opening set after 59 minutes. Stosur broke in the third and fifth games of the second set and held to finish in 88 minutes.<br /><br />French 11th seed Marion Bartoli also advanced with a 6-2, 6-4 victory over compatriot Kristina Mladenovic, setting up a last 16 match against fifth-seeded Czech Petra Kvitova, who defeated Pauline Parmentier of France 6-4, 6-4 to reach the fourth round.<br /><br />Third-seeded Russian Maria Sharapova, the reigning French Open champion, meets US wildcard Mallory Burdette and Belarus top seed Victoria Azarenka, the reigning Australian Open champion, plays China's Zheng Jie later.</p>