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Swimming - Olympics: Day 6 Michael Phelps of the United States winning the Men's 200m Individual Medley Final during the swimming competition at the Olympic Aquatics Stadium August 11, 2016 in Rio de Janeiro, Brazil. (Photo by Tim Clayton/Corbis via Getty Images)

Swimming - Olympics: Day 6   Michael Phelps of the United States winning the Men's 200m Individual Medley Final during the swimming competition at the Olympic Aquatics Stadium August 11, 2016 in Rio de Janeiro, Brazil. (Photo by Tim Clayton/Corbis via Getty Images)

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RIO DE JANEIRO, BRAZIL - AUGUST 11: Michael Phelps of the United States celebrates winning gold in the Men's 200m Individual Medley Final on Day 6 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 11, 2016 in Rio de Janeiro, Brazil. (Photo by Adam Pretty/Getty Images)

RIO DE JANEIRO, BRAZIL - AUGUST 11:  Michael Phelps of the United States celebrates winning gold in the Men's 200m Individual Medley Final on Day 6 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 11, 2016 in Rio de Janeiro, Brazil.  (Photo by Adam Pretty/Getty Images)

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RIO DE JANEIRO, BRAZIL - AUGUST 11: Gold medalist Michael Phelps of the United States celebrates during the medal ceremony for the Men's 200m Individual Medley Final on Day 6 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 11, 2016 in Rio de Janeiro, Brazil. (Photo by Clive Rose/Getty Images)

RIO DE JANEIRO, BRAZIL - AUGUST 11:  Gold medalist Michael Phelps of the United States celebrates during the medal ceremony for the Men's 200m Individual Medley Final on Day 6 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 11, 2016 in Rio de Janeiro, Brazil.  (Photo by Clive Rose/Getty Images)

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Gold medallist USA's Michael Phelps (C) poses with silver medallist Japan's Kosuke Hagino (L) and bronze medallist China's Wang Shun on the podium of the Men's 200m Individual Medley Final during the swimming event at the Rio 2016 Olympic Games at the Olympic Aquatics Stadium in Rio de Janeiro on August 11, 2016. / AFP / CHRISTOPHE SIMON (Photo credit should read CHRISTOPHE SIMON/AFP/Getty Images)

Gold medallist USA's Michael Phelps (C) poses with silver medallist Japan's Kosuke Hagino (L) and bronze medallist China's Wang Shun on the podium of the Men's 200m Individual Medley Final during the swimming event at the Rio 2016 Olympic Games at the Olympic Aquatics Stadium in Rio de Janeiro on August 11, 2016.   / AFP / CHRISTOPHE SIMON        (Photo credit should read CHRISTOPHE SIMON/AFP/Getty Images)