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RIO DE JANEIRO, BRAZIL - AUGUST 18: Dalilah Muhammad of the United States competes on her way to winning gold in the Women's 400m Hurdles Final on Day 13 of the Rio 2016 Olympic Games at the Olympic Stadium on August 18, 2016 in Rio de Janeiro, Brazil. (Photo by Alexander Hassenstein/Getty Images)

RIO DE JANEIRO, BRAZIL - AUGUST 18:  Dalilah Muhammad of the United States competes on her way to winning gold in the Women's 400m Hurdles Final on Day 13 of the Rio 2016 Olympic Games at the Olympic Stadium on August 18, 2016 in Rio de Janeiro, Brazil.  (Photo by Alexander Hassenstein/Getty Images)