Former Olympic doubles gold medalist Li Na came out the second Chinese casualty under Polish Agnieszka Radwanska as she was knocked out of Wimbledon in a third-round straight sets defeat on Saturday.

The 11th-seeded Radwanska had knocked out the Chinese number three Peng Shuai in the second round.

Li, ranked second in China and seeded 19 at Wimbledon, lost 6-4, 7-5 in an hour and 33 minutes, despite a valiant showing in which she saved a string of match points.

"After the match I talked to the coach and we didn't know why I missed the ball like crazy. No idea, " said a downbeat Li.

"Always it's very good to be in the second week of a Grand Slam. So I'm very happy with that, especially after two difficult matches," Radwanska said.

Radwanska will next play American qualifier Melanie Oudin, the world number 124, for a place in the quarterfinals.

Wimbledon debutante Oudin is the youngest player left in the draw at 17. She beat Serbian sixth seed Jelena Jankovic in the third round.

(Xinhua News Agency June 28, 2009)