Britain's Niall Flannery (R) and Kerron Clement of the U.S. after competing in the men's 400 metres...
Britain's Niall Flannery (R) and Kerron Clement of the U.S. after competing in the men's 400 metres hurdles heats during the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. REUTERS/David Gray