File photos (From L to R) show China's Sun Yang celebrates winning the men's 400m freestyle final of Swimming at the 15th FINA Aquatics World Championships in Barcelona, Spain on July 28, 2015, the 16th FINA Aquatics World Championships in Kazan, Russia on Aug. 2, 2015 and the 17th FINA Aquatics World Championships in Budapest, Hungary on July 23, 2017. Chinese swimming ace Sun Yang won his third straight title in men's 400m freestyle in Budapest on Sunday. (Xinhua/Guo Yong, Meng Yongmin, Gong Bing)
