Liu Xiang back on track after 13 months' lay-off

China's 110m-hurdler Liu Xiang (L) sprints towards the finishing line next to Terrence Trammell of the United States at the 2009 Shanghai Golden Grand Prix in Shanghai, China, on Sept. 20, 2009. Liu made a comeback on Sunday after his Olympic withdrawal, finishing second in 13.15 seconds. Trammell, who also clocked 13.15 seconds but beat Liu at photo finish, took the gold medal