China's Liu Xiang kisses the last hurdle in his lane after he crashed and failed to finish his men's 110m hurdles round 1 heat at the London 2012 Olympic Games at the Olympic Stadium August 7, 2012. Liu crashed out of the heats in the 110 metres hurdles at the London Olympics on Tuesday in an echo of his injury-induced withdrawal from the same stage of the Beijing Games four years ago. REUTERS/David Gray (BRITAIN - Tags: OLYMPICS SPORT ATHLETICS)