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TOPSHOT - USA's Michael Phelps competes in a Men's 200m Butterfly heat during the swimming event at the Rio 2016 Olympic Games at the Olympic Aquatics Stadium in Rio de Janeiro on August 8, 2016. (Photo by GABRIEL BOUYS / AFP) (Photo credit should read GABRIEL BOUYS/AFP/Getty Images)

TOPSHOT - USA's Michael Phelps competes in a Men's 200m Butterfly heat during the swimming event at the Rio 2016 Olympic Games at the Olympic Aquatics Stadium in Rio de Janeiro on August 8, 2016. (Photo by GABRIEL BOUYS / AFP)        (Photo credit should read GABRIEL BOUYS/AFP/Getty Images)