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RIO DE JANEIRO, BRAZIL - AUGUST 13: Michael Phelps of the United States competes in the Men's 4 x 100m Medley Relay Final on Day 8 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 13, 2016 in Rio de Janeiro, Brazil. (Photo by William Volcov/Brazil Photo Press/LatinContent/Getty Images)

RIO DE JANEIRO, BRAZIL - AUGUST 13: Michael Phelps of the United States competes in the Men's 4 x 100m Medley Relay Final on Day 8 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 13, 2016 in Rio de Janeiro, Brazil. (Photo by William Volcov/Brazil Photo Press/LatinContent/Getty Images)