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Australia's Mack Horton reacts after a heat for the men's 800m freestyle event during the swimming competition at the 2019 World Championships in Gwangju, South Korea, July 23, 2019. (Xinhua/Tao Xiyi)
Australia's Mack Horton reacts after a heat for the men's 800m freestyle event during the swimming competition at the 2019 World Championships in Gwangju, South Korea, July 23, 2019. (Xinhua/Tao Xiyi)