Jamaican sprinter Usain Bolt

Associated Press
Jamaican Olympic gold medalist Usain Bolt, center, and sprinter Daniel Bailey, from Antigua and Barbuda, center left, run with young athletes during their visit to the Projeto Futuro Olimpico or Olympic Future Project in Rio de Janeiro, Brazil, Thursday, March 28, 2013. The Olympic Future Project promotes the practice of sports and healthy living, targeting the low-income populations of the inner city. (AP Photo/Felipe Dana)

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The Jamaican sprinter and three-time Olympic gold medalist will be one of the biggest names to watch at the London Games.

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