Dayron Robles of Cuba (R) crosses the finish line ahead of Liu Xiang of China (L) and Jason Richardson of the US (C) during the men's 110 metres hurdles final at the IAAF 2011 World Championship in Daegu, August 29, 2011.[Photo/Agencies]

Dayron Robles of Cuba sprints to the finish line ahead of Aries Merritt of the US (L), Liu Xiang of China (2nd L) and David Oliver of the US (R) during the men's 110 metres hurdles final at the IAAF World Athletics Championships in Daegu August 29, 2011. [Photo/Agencies]