RIO DE JANEIRO, BRAZIL - AUGUST 08: Michael Phelps of United States poses with his Gold medal after winning the Men's 200m Butterfly and his 20th Olympic Gold medal 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 Ian MacNicol/Getty Images)
RIO DE JANEIRO, BRAZIL - AUGUST 09: Michael Phelps of the USA kisses his medal with a tear in his eye after winning Gold 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 Janerio, Brazil. (Photo by Vaughn Ridley/Getty Images)
RIO DE JANEIRO, BRAZIL - AUGUST 08: Michael Phelps of United States on his way to winning the Men's 200m Butterfly and his 20th Olympic Gold medal 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 Ian MacNicol/Getty Images)
RIO DE JANEIRO, BRAZIL - AUGUST 08: Michael Phelps of United States celebrates winning the Men's 200m Butterfly and his 20th Olympic Gold medal 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 Ian MacNicol/Getty Images)
RIO DE JANEIRO, BRAZIL - AUGUST 08: Michael Phelps of United States celebrates winning the Men's 200m Butterfly and his 20th Olympic Gold medal 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 Ian MacNicol/Getty Images)
