China's Wang Shixian competes during her quarterfinal women's singles match against Cheng Shao Chieh of Chinese Taipei in 2011's Badminton World Championships at Wembley Arena, London, Britain, Aug. 12, 2011. Wang lost 0-2. [Xinhua/Zeng Yi]

The women's singles world No.1 Wang Shixian from China was knocked out of the Badminton World Championships by Chinese Taipei player Cheng Shao Chieh on Friday in the quarterfinals.

The Asian Games champion Wang couldn't find her rhythm while against the seventh seed, losing the match 16-21, 17-21.

"I just couldn't play my own game while facing her," said Wang who also lost to Cheng in their most recent clash at Indonesia Open in June. "But I felt I played better than last time. I hope I could take the victory when we meet again."

Wang, 21, failed to repeat a semifinal finish of last year's World Championships while the 25-year-old Cheng managed to reach the same stage as she did at the 2005 World Championships.

"I did that once when I was young, I'm old now," Cheng joked. "I have never thought about the result, I'm just relaxed and enjoy badminton."

"I think Wang and other Chinese girls shoulder more pressures, but I have nothing to lose," said Cheng, who will meet the winner between Germany's ninth seed Juliane Schenk and Dane veteran Tine Baun.