Jamaican sprinter Usain Bolt

Associated Press
Jamaica's Usain Bolt reacts after receiving a gold medal for the men's 4x100-meter during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Saturday, Aug. 11, 2012. (AP Photo/Matt Slocum)

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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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