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RIO DE JANEIRO, BRAZIL - AUGUST 07: Michael Phelps and Caeleb Dressel of the United States celebrate winning gold in the Final of the Men's 4 x 100m Freestyle Relay on Day 2 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 7, 2016 in Rio de Janeiro, Brazil. (Photo by Julian Finney/Getty Images)

RIO DE JANEIRO, BRAZIL - AUGUST 07:  Michael Phelps and Caeleb Dressel of the United States celebrate winning gold in the Final of the Men's 4 x 100m Freestyle Relay on Day 2 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 7, 2016 in Rio de Janeiro, Brazil.  (Photo by Julian Finney/Getty Images)