China's Sun Yang reacts after the final of the men's 1500-metre freestyle swimming competition in the FINA World Championships in Barcelona on Aug. 4, 2013. Sun Yang won the 3rd gold of World Championship with 1,500 meter freestyle triumph. (Xinhua/Xie Haining)

China's Sun Yang competes in the final of the men's 1500-metre freestyle swimming competition in the FINA World Championships in Barcelona on Aug. 4, 2013. Sun Yang won the 3rd gold of World Championship with 1,500 meter freestyle triumph. (Xinhua/Xie Haining)

China's Sun Yang reacts after the final of the men's 1500-metre freestyle swimming competition in the FINA World Championships in Barcelona on Aug. 4, 2013. Sun Yang won the 3rd gold of World Championship with 1,500 meter freestyle triumph. (Xinhua/Xie Haining)

Sun Yang of China poses during the awarding ceremony of the men's 1500-metre freestyle final of the swimming competition at the 15th FINA World Championships in Barcelona on Aug. 4, 2013. Sun Yang won the 3rd gold of World Championship with 1,500 meter freestyle triumph. (Xinhua/Xie Haining)

China's Sun Yang reacts after the final of the men's 1500-metre freestyle swimming competition in the FINA World Championships in Barcelona on Aug. 4, 2013. Sun Yang won the 3rd gold of World Championship with 1,500 meter freestyle triumph. (Xinhua/Xie Haining)

China's Sun Yang competes in the final of the men's 1500-metre freestyle swimming competition in the FINA World Championships in Barcelona on Aug. 4, 2013. Sun Yang won the 3rd gold of World Championship with 1,500 meter freestyle triumph. (Xinhua/Xie Haining)