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RIO DE JANEIRO, BRAZIL - AUGUST 20: Allyson Felix of the United States competes during the Women's 4 x 400 meter Relay on Day 15 of the Rio 2016 Olympic Games at the Olympic Stadium on August 20, 2016 in Rio de Janeiro, Brazil. (Photo by Bob Thomas/Popperfoto/Getty Images).

RIO DE JANEIRO, BRAZIL - AUGUST 20:  Allyson Felix of the United States competes during the Women's 4 x 400 meter Relay  on Day 15 of the Rio 2016 Olympic Games at the Olympic Stadium on August 20, 2016 in Rio de Janeiro, Brazil. (Photo by Bob Thomas/Popperfoto/Getty Images).