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Michael Phelps pose for photographers at an Omega promotional event in Rio de Janeiro, Brazil, August 15, 2016. AFP PHOTO/ MARTIN BERNETTI Michael Phelps ended his swimming legend's career with 23 Olympic gold medals at the Rio Games. / AFP / MARTIN BERNETTI (Photo credit should read MARTIN BERNETTI/AFP/Getty Images)

Michael Phelps pose for photographers at an Omega promotional event in  Rio de Janeiro, Brazil, August 15, 2016. AFP PHOTO/ MARTIN BERNETTI
Michael Phelps ended his swimming legend's career with 23 Olympic gold medals at the Rio Games. / AFP / MARTIN BERNETTI        (Photo credit should read MARTIN BERNETTI/AFP/Getty Images)