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Jamaica's Usain Bolt holds his national flag following his win in the men's 100-meter final during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Sunday, Aug. 5, 2012.(AP Photo/Kirsty Wigglesworth)

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