Wang Yihan came from behind to beat injured Maria Kristin Yulianti 16-21, 21-5, 21-10 in the women's singles. "I'm not familiar with Yulianti because I only watched her playing through video," Wang said. "I could not adapt to her rhythm in the beginning but I gradually adjusted and won."

Yulianti limped off the court because of her right knee injury. She said afterwards that it was hard for her to continue during the match.

"The injury really hurts. I could have tied the match at 1-1 if I was healthy," said Yulianti, the world No.15.

Lin "Super" Dan overcame a sluggish start to beat Simon Santoso 13-21, 21-14, 21-11. "I had really a poor start tonight," said Lin. "I felt quite different from I was in the previous two matches. I hope my form will becoming better in the semifinals."

Cai Yun and Fu Haifeng (front) of China compete during the men's doubles competition against Hendra Setiawan/Mohammad Ahsan of Indonesia at the 11th Sudirman Cup World Team Badminton Championship in Guangzhou, capital of south China's Guangdong Province, May 14, 2009.

Du Jing/Yu Yang crushed Poili Greysia/Nitya Krishinda Maheswari in the women's doubles 21-15, 21-13 before Zheng Bo/Ma Jin closed the match with a 22-20, 19-21 and 21-14 victory over over Devin Lahardi Fitriawan/Lita Nurlita in the mixed doubles. "It is a good thing for players to have tough matches," said Li Yongbo, head-coach of Chinese national team. "Players will be more careful in the upcoming games."

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