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RIO DE JANEIRO, BRAZIL - AUGUST 08: Michael Phelps of the United States prepares in the second Semifinal of the Men's 200m Butterfly on Day 3 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 8, 2016 in Rio de Janeiro, Brazil. (Photo by Al Bello/Getty Images)

RIO DE JANEIRO, BRAZIL - AUGUST 08:  Michael Phelps of the United States prepares in the second Semifinal of the Men's 200m Butterfly on Day 3 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 8, 2016 in Rio de Janeiro, Brazil.  (Photo by Al Bello/Getty Images)