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Jamaica's Usain Bolt, third from bottom, leads on his way to win the men's 100 meter final race during the athletics competition in the Olympic Stadium at the 2012 Summer Olympics, London, Sunday, Aug. 5, 2012. (AP Photo/Mark Duncan)

Usain Bolt wins the 100m

Usain Bolt repeats as victor of the talent-packed men's 100-meter race, retaining the title of 'world's fastest man.' Here's a look at him and his challengers. -- By Lauren Jones, Yahoo! Sports