Greene clears a hurdle during their men's 400 metres hurdles semi-final at the IAAF World Championships...
David Greene of Britain clears a hurdle next to Isa Phillips of Jamaica (L) and Felix Sanchez of the Dominican Republic (R) during their men's 400 metres hurdles semi-final at the IAAF World Championships in Daegu August 30, 2011. REUTERS/David Gray (SOUTH KOREA - Tags: SPORT ATHLETICS)