Track and field stars of the 2012 Olympics
5
Dayron Robles (center), of Cuba, pulls up after injuring his leg while competing with Aries Merritt (L) and Jason Richardson of the U.S. during the men's 110m hurdles final.
6
Sarah Attar, the first woman from Saudi Arabia to compete in Olympic track and field, runs in her women's 800m round 1 heat.
7
China's Liu Xiang falls after hitting a hurdle in his men's 110m hurdles round 1 heat, clutching the same right Achilles tendon that doomed his chances at the Beijing Games in 2008.
8
Australia's Sally Pearson won gold in the women's 100m hurdles final.