
China's Lin Dan returns the shuttlecock to Boonsak Ponsana from Thailand during their semi-finals of men's singles at the Yonex German Open Badminton Grand Prix Gold 2011 in Mulheim, Germany, March 5, 2011. Lin Dan won 2-0 to enter the final. (Xinhua/Luo Huanhuan)

Boonsak Ponsana from Thailand returns the shuttlecock to China's Lin Dan during their semi-finals of men's singles at the Yonex German Open Badminton Grand Prix Gold 2011 in Mulheim, Germany, March 5, 2011. Lin Dan won 2-0 to enter the final. (Xinhua/Luo Huanhuan)

China's Lin Dan (L) shakes hands with Boonsak Ponsana from Thailand after their semi-finals of men's singles at the Yonex German Open Badminton Grand Prix Gold 2011 in Mulheim, Germany, March 5, 2011. Lin Dan won 2-0 to enter the final. (Xinhua/Luo Huanhuan)

China's Liu Xin returns the shuttlecock to Ji Hyun Sung from South Korea during their semi-finals of women's singles at the Yonex German Open Badminton Grand Prix Gold 2011 in Mulheim, Germany, March 5, 2011. Liu Xin won 2-0 to enter the final. (Xinhua/Luo Huanhuan)