Jamaican sprinter Usain Bolt

Associated Press
Jamaica's Usain Bolt, right, crosses the line to win the men's 400m relay for his team Racers Track Club during the Diamond League athletics meet at the stadium in the Queen Elizabeth Olympic Park, London, Saturday, July 27, 2013. The athletics meet marks the anniversary of the London 2012 Olympic Games. (AP Photo/Matt Dunham)

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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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