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File photo taken on July 21, 2019 shows Sun Yang of China celebrating after the men's 400m freestyle final at the Gwangju 2019 FINA World Championships in Gwangju, South Korea. Sun won gold medals in the men's 200m and 400m freestyle at the FINA World Championships in Gwangju, South Korea. The 28-year-old's 400m freestyle victory was his fourth straight worlds title over that distance, and his 11 World Championship gold medals are only four short of American legend Michael Phelps' record. (Xinhua/Bai Xuefei)
