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Xu Jiayu of China reacts before the men's 50m backstroke final at the Gwangju 2019 FINA World Championships in Gwangju, South Korea, July 28, 2019. (Xinhua/Xia Yifang)

Xu Jiayu of China reacts before the men's 50m backstroke final at the Gwangju 2019 FINA World Championships in Gwangju, South Korea, July 28, 2019. (Xinhua/Xia Yifang)