Jamaican sprinter Usain Bolt

Associated Press
Jamaica's Usain Bolt competes in a Men's 100m race at the Golden Spike Athletic meeting in Ostrava, Czech Republic, Friday, May 25, 2012. (AP Photo/Petr David Josek)

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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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