Allyson Felix of the United States reacts after competing in the Women's 400 metres heats during day three of the 15th IAAF World Athletics Championships Beijing 2015 at Beijing National Stadium on August 24, 2015 in Beijing, China. (Photo by Lintao Zhang/Getty Images for IAAF)
Marusa Mismas of Slovenia (C) and Madeline Heiner of Australia (R) compete in the Women's 3000 metres steeplechase heats during day three of the 15th IAAF World Athletics Championships Beijing 2015 at Beijing National Stadium on August 24, 2015 in Beijing, China. (Photo by Christian Petersen/Getty Images for IAAF)
Tori Pena of Ireland competes in the Women's Pole Vault qualification during day three of the 15th IAAF World Athletics Championships Beijing 2015 at Beijing National Stadium on August 24, 2015 in Beijing, China. (Photo by Christian Petersen/Getty Images for IAAF)
Rolanda Bell of Panama falls in the Women's 3000 metres steeplechase heats during day three of the 15th IAAF World Athletics Championships Beijing 2015 at Beijing National Stadium on August 24, 2015 in Beijing, China. (Photo by Alexander Hassenstein/Getty Images for IAAF)
