Clement of the U.S. reacts after the men's 400 metres hurdles semi-final heat event of the IAAF World...
Kerron Clement of the U.S. reacts after the men's 400 metres hurdles semi-final heat event of the IAAF World Athletics Championships at the Luzhniki Stadium in Moscow, August 13, 2013. REUTERS/Lucy Nicholson (RUSSIA - Tags: SPORT ATHLETICS)