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Australia's Mack Horton (C) holds the Australian flag as he poses on the podium with silver medallist China's Sun Yang (R) and bronze medallist Italy's Grabriele Detti after he won the Men's 400m Freestyle Final during the swimming event at the Rio 2016 Olympic Games at the Olympic Aquatics Stadium in Rio de Janeiro on August 6, 2016. (Photo by CHRISTOPHE SIMON / AFP) (Photo credit should read CHRISTOPHE SIMON/AFP/Getty Images)

Australia's Mack Horton (C) holds the Australian flag as he poses on the podium with silver medallist China's Sun Yang (R) and bronze medallist Italy's Grabriele Detti after he won the Men's 400m Freestyle Final during the swimming event at the Rio 2016 Olympic Games at the Olympic Aquatics Stadium in Rio de Janeiro on August 6, 2016. (Photo by CHRISTOPHE SIMON / AFP)        (Photo credit should read CHRISTOPHE SIMON/AFP/Getty Images)