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RIO DE JANEIRO, BRAZIL - AUGUST 06: Yang Sun of China competes in heat six of the Men's 400m Freestyle on Day 1 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on on August 6, 2016 in Rio de Janeiro, Brazil. (Photo by Lars Baron/Getty Images)

RIO DE JANEIRO, BRAZIL - AUGUST 06: Yang Sun of China competes in heat six of the Men's 400m Freestyle on Day 1 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on on August 6, 2016 in Rio de Janeiro, Brazil. (Photo by Lars Baron/Getty Images)
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Getty Images Sport Lars Baron