South Korea's Lee Yong Dae (front) and Ko Sung Hyun compete during men's doubles at the the 2013 Sudirman Cup world mixed team badminton championships against Jongjit Maneepong and Puanguapech Nipitphon of Thailand in Kuala Lumpur, Malaysia, on May 21, 2013. Lee Yong Dae and Ko Sung Hyun won 2-0. (Xinhua/Zhang Wenzong)

South Korea's Lee Yong Dae (back) and Ko Sung Hyun compete during men's doubles at the the 2013 Sudirman Cup world mixed team badminton championships against Jongjit Maneepong and Puanguapech Nipitphon of Thailand in Kuala Lumpur, Malaysia, on May 21, 2013. Lee Yong Dae and Ko Sung Hyun won 2-0. (Xinhua/Zhang Wenzong)