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Olympics Day 9 - Athletics

LONDON, ENGLAND - AUGUST 05: Usain Bolt of Jamaica celebrates winning gold in the Men?s 100m Final on Day 9 of the London 2012 Olympic Games at the Olympic Stadium on August 5, 2012 in London, England. (Photo by Stu Forster/Getty Images)

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