Clement clears a hurdle during their men's 400 metres hurdles heat at the IAAF World Championships in...
Kerron Clement of the U.S. clears a hurdle next to L.J. van Zyl of South Africa (L) and Felix Sanchez of the Dominican Republic (R) during their men's 400 metres hurdles heat at the IAAF World Championships in Daegu August 29, 2011. REUTERS/David Gray (SOUTH KOREA - Tags: SPORT ATHLETICS)