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Gold medalist Caeleb Dressel of the United States competes during the men's 100m butterfly final at FINA World Championships in Gwangju, South Korea, on July 27, 2019. (Xinhua/Bai Xuefei)

Gold medalist Caeleb Dressel of the United States competes during the men's 100m butterfly final at FINA World Championships in Gwangju, South Korea, on July 27, 2019. (Xinhua/Bai Xuefei)