Wang Xiaoli (R) and Yu Yang of China celebrate victory with their coaches after the women's doubles final match against Jang Ye Na and Hye Won Eom of South Korea at the 2013 BWF World Championships in Guangzhou, capital of south China's Guangdong Province, Aug. 11, 2013. Wang and Yu won the title 2-1. (Xinhua/Bai Xuefei)

Yu Yang (Front) and Wang Xiaoli of China compete during the women's doubles final match against Jang Ye Na and Hye Won Eom of South Korea at the 2013 BWF World Championships in Guangzhou, capital of south China's Guangdong Province, Aug. 11, 2013. Wang and Yu won the title 2-1. (Xinhua/Lu Hanxin)

Yu Yang (Front) and Wang Xiaoli of China compete during the women's doubles final match against Jang Ye Na and Hye Won Eom of South Korea at the 2013 BWF World Championships in Guangzhou, capital of south China's Guangdong Province, Aug. 11, 2013. Wang and Yu won the title 2-1. (Xinhua/Lu Hanxin)

Yu Yang (R) and Wang Xiaoli of China celebrate victory after the women's doubles final match against Jang Ye Na and Hye Won Eom of South Korea at the 2013 BWF World Championships in Guangzhou, capital of south China's Guangdong Province, Aug. 11, 2013. Wang and Yu won the title 2-1. (Xinhua/Bai Xuefei)

Eom Hye Won and Jang Ye Na (R) of South Korea compete during the women's double final match against Wang Xiaoli and Yu Yang of China at the 2013 BWF World Championships in Guangzhou, capital of south China's Guangdong Province, Aug. 11, 2013. Yu Yang and Wang Xiaoli won 2-1. (Xinhua/Mao Siqian)

Eom Hye Won and Jang Ye Na (L) of South Korea attend the medal presenting ceremony after the women's double final match against Wang Xiaoli and Yu Yang of China at the 2013 BWF World Championships in Guangzhou, capital of south China's Guangdong Province, Aug. 11, 2013. Yu Yang and Wang Xiaoli won 2-1. (Xinhua/Mao Siqian)