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USA's gold medallist Michael Phelps waves after the podium ceremony of the Men's swimming 4 x 100m Medley Relay Final at the Rio 2016 Olympic Games at the Olympic Aquatics Stadium in Rio de Janeiro on August 13, 2016. / AFP / Martin BUREAU (Photo credit should read MARTIN BUREAU/AFP/Getty Images)

USA's gold medallist Michael Phelps waves after the podium ceremony of the Men's swimming 4 x 100m Medley Relay Final at the Rio 2016 Olympic Games at the Olympic Aquatics Stadium in Rio de Janeiro on August 13, 2016.   / AFP / Martin BUREAU        (Photo credit should read MARTIN BUREAU/AFP/Getty Images)