China's Liu Xiang (R) has his arm held up by Hungary's Balazs Baji after crashing into the first hurdle during their men's 110m hurdles round 1 heat at the London 2012 Olympic Games at the Olympic Stadium August 7, 2012. Liu experienced deja vu of the most agonising kind on Tuesday when the Achilles injury that forced him out of the high hurdles heats in Beijing four years ago ended his London Olympics campaign at the same stage. REUTERS/Lucy Nicholson (BRITAIN - Tags: SPORT OLYMPICS ATHLETICS)