Jamaican sprinter Usain Bolt

Associated Press
File - United States' Aries Merritt, left, crosses the finish line in the men's 110-meter hurdles final to win gold ahead of Jamaica's Hansle Parchment during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, in this Wednesday, Aug. 8, 2012 file photo. Olympic hurdles champion Merritt is facing some of his toughest competition at the IAAF's 100th anniversary gala. Three months after winning the 110-meter hurdles at the London Games, Merritt will be up against Usain Bolt and 800-meter gold medalist David Rudisha for the IAAF's World Athlete of the Year award.  (AP Photo/David J. Phillip, file)

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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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