Jamaican sprinter Usain Bolt

Associated Press
World champion Yohan Blake, left, celebrates after crossing the finish line ahead of current world-record holder Usain Bolt, second from right, Nesta Carter, right, and Michael Frater to win the 100m final at Jamaica's Olympic trials in Kingston, Jamaica, Friday, June 29, 2012. Blake pulled a stunner finishing in 9.75 seconds to upset Bolt by 0.11 seconds. (AP Photo/Collin Reid)

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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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