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RIO DE JANEIRO, BRAZIL - AUGUST 06: Katinka Hosszu of Hungary wins Gold and sets a new World Record in the Women's 400m Individual Final on Day 1 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 6, 2016 in Rio de Janerio, Brazil. (Photo by Vaughn Ridley/Getty Images)

RIO DE JANEIRO, BRAZIL - AUGUST 06:  Katinka Hosszu of Hungary wins Gold and sets a new World Record in the Women's 400m Individual Final on Day 1 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 6, 2016 in Rio de Janerio, Brazil.  (Photo by Vaughn Ridley/Getty Images)

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RIO DE JANEIRO, BRAZIL - AUGUST 06: Katinka Hosszu of Hungary wins Gold and sets a new World Record in the Women's 400m Individual Final on Day 1 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 6, 2016 in Rio de Janerio, Brazil. (Photo by Vaughn Ridley/Getty Images)

RIO DE JANEIRO, BRAZIL - AUGUST 06:  Katinka Hosszu of Hungary wins Gold and sets a new World Record in the Women's 400m Individual Final on Day 1 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 6, 2016 in Rio de Janerio, Brazil.  (Photo by Vaughn Ridley/Getty Images)

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RIO DE JANEIRO, BRAZIL - AUGUST 06: Katinka Hosszu of Hungary poses with her Gold medal after winning the Women's 400m IM on Day 1 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 6, 2016 in Rio de Janeiro, Brazil. (Photo by Ian MacNicol/Getty Images)

RIO DE JANEIRO, BRAZIL - AUGUST 06:  Katinka Hosszu of Hungary poses with her Gold medal after winning the Women's 400m IM on Day 1 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 6, 2016 in Rio de Janeiro, Brazil. (Photo by Ian MacNicol/Getty Images)

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RIO DE JANEIRO, BRAZIL - AUGUST 06: (L-R) Silver medalist Maya Dirado of the United States of America, gold medal medalist Katinka Hosszu and bronze medalist Mireia Belmonte Garcia of Spain pose during the medal ceremony for the Final of the Women's 400m Individual Medley on Day 1 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 6, 2016 in Rio de Janeiro, Brazil. (Photo by Clive Rose/Getty Images)

RIO DE JANEIRO, BRAZIL - AUGUST 06:  (L-R) Silver medalist Maya Dirado of the United States of America, gold medal medalist Katinka Hosszu and bronze medalist Mireia Belmonte Garcia of Spain pose during the medal ceremony for the Final of the Women's 400m Individual Medley on Day 1 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 6, 2016 in Rio de Janeiro, Brazil.  (Photo by Clive Rose/Getty Images)