<p>               China's Sun Yang, centre, holds up his gold medal as silver medalist Australia's Mack Horton, left, stands away from the podium and bronze medalist Italy's Gabriele Detti after the men's 400m freestyle final at the World Swimming Championships in Gwangju, South Korea, Sunday, July 21, 2019. (AP Photo/Mark Schiefelbein)             </p>
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