RIO DE JANEIRO, BRAZIL - AUGUST 06: Gold medalist Mack Horton of Australia poses during the medal ceremony for the Final of the Men's 400m Freestyle 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 Adam Pretty/Getty Images)
RIO DE JANEIRO, BRAZIL - AUGUST 06: Gold medalist Mack Horton of Australia poses during the medal ceremony for the Final of the Men's 400m Freestyle 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 Yang Sun of China, gold medal medalist Mack Horton of Australia and bronze medalist Gabriele Detti of Italy pose during the medal ceremony for the Final of the Men's 400m Freestyle 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: Mack Horton of Australia celebrates winning gold in the Final of the Men's 400m Freestyle 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 Al Bello/Getty Images)
RIO DE JANEIRO, BRAZIL - AUGUST 06: Mack Horton of Australia celebrates winning gold in the Final of the Men's 400m Freestyle 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 Al Bello/Getty Images)
