RIO DE JANEIRO, BRAZIL - AUGUST 09: Michael Phelps of the United States competes in the Men's 200m Butterfly Final on Day 4 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 9, 2016 in Rio de Janeiro, Brazil. (Photo by Clive Rose/Getty Images)
RIO DE JANEIRO, BRAZIL - AUGUST 9: Gold medalist Michael Phelps of USA kisses his 3 months old son Boomer Phelps following the medal ceremony for the men's 200m butterfly on day 4 of the Rio 2016 Olympic Games at Olympic Aquatics Stadium on August 9, 2016 in Rio de Janeiro, Brazil. (Photo by Jean Catuffe/Getty Images)
RIO DE JANEIRO, BRAZIL - AUGUST 09: Michael Phelps of United States celebrates his gold medal after the final men's 100m freestyle at Olympic Aquatics Stadium on August 9, 2016 in Rio de Janeiro, Brazil. (Photo by Xavier Laine/Getty Images)
RIO DE JANEIRO, BRAZIL - AUGUST 9: Silver medalist Masato Sakai of Japan, gold medalist Michael Phelps of USA, bronze medalist Tamas Kenderesi of Hungary pose during the medal ceremony of the men's 200m butterfly on day 4 of the Rio 2016 Olympic Games at Olympic Aquatics Stadium on August 9, 2016 in Rio de Janeiro, Brazil. (Photo by Jean Catuffe/Getty Images)
