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

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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)

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Jamaica's Usain Bolt crosses the finish line to win gold 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/David J. Phillip )

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Jamaica's Usain Bolt competes in a men's 100-meter semifinal during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Sunday, Aug. 5, 2012. (AP Photo/Matt Dunham)

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Jamaica's Usain Bolt, center right, celebrates winning gold in the men's 100-meter final with his mother Jennifer, center, and silver medallist Yohan Blake of Jamaica, center left, during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Sunday, Aug. 5, 2012. (AP Photo/David J. Phillip )

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Jamaica's Usain Bolt, center, leads 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/Anja Niedringhaus)

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Jamaica's Usain Bolt celebrates winning gold 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/David J. Phillip)

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Jamaica's Usain Bolt celebrates winning gold in the men's 100-meter final, followed by silver medalist Yohan Blake of Jamaica, back right, during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Sunday, Aug. 5, 2012. (AP Photo/David J. Phillip )

Olympics Day 9 - Athletics

LONDON, ENGLAND - AUGUST 05: Bronze medalist Justin Gatlin of the United States and gold medalist Usain Bolt of Jamaica celebrate after competing 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 Michael Steele/Getty Images)

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Jamaica's Usain Bolt, center, gestures before competing in the men's 100-meter final alongside United States' Justin Gatlin, right, and Netherlands' Churandy Martina, left, during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Sunday, Aug. 5, 2012. (AP Photo/Matt Dunham)

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United States' Justin Gatlin during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Sunday, Aug. 5, 2012. (AP Photo/Anja Niedringhaus)

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XXX. Olympische Sommerspiele, Leichtathletik, Finale, 100 Meter der Maenner, Sonntag (05.08.12), Olympiastadion, London, Grossbritannien: Usain Bolt (Jamaika) jubelt mit Zuschauern nach dem Rennen. Superstar Usain Bolt ist wieder der schnellste Mann der Welt. Der 25 Jahre alte Jamaikaner verwies im olympischen Endlauf von London in 9,63 Sekunden den Weltmeister und Teamgefaehrten Yohan Blake (9,75 Sekunden) sowie Justin Gatlin (USA/9,79) auf die weiteren Medaillenplaetze und verfehlte mit der zweitschnellsten Zeit der Geschichte seinen Weltrekord von 9,58 Sekunden nur um fuenf Hundertstel. (zu dapd-Text) Foto: Thomas Lohnes/dapd

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Jamaica's Usain Bolt, left, crosses the finish line ahead of Jamaica's Yohan Blake, right, United States' Justin Gatlin, second from right, United State's Ryan Bailey, third from right, and Netherlands' Churandy Martina to win gold 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/David J. Phillip )

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Jamaica's Usain Bolt celebrates after crossing the finish line to win gold in the men's 100-meter final during the athletics competition in the Olympic Stadium at the 2012 Summer Olympics, Sunday, Aug. 5, 2012, in London. (AP Photo/Matt Slocum)

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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)

Olympics Day 9 - Athletics

LONDON, ENGLAND - AUGUST 05: Usain Bolt of Jamaica celebrates after crossing the finish line to win the gold medal 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 Shaun Botterill/Getty Images)

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)

Olympics Day 9 - Athletics

LONDON, ENGLAND - AUGUST 05: Usain Bolt of Jamaica crosses the finish line ahead of Ryan Bailey of the United States, Yohan Blake of Jamaica and Justin Gatlin of the United States to win 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 Michael Steele/Getty Images)

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)

Jamaica's Usain Bolt, right, celebrates winning gold alongside silver medallist Yohan Blake of Jamaica, left, following 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/Daniel Ochoa De Olza)

Jamaica's Usain Bolt, left, prepares to pass United States' Justin Gatlin, center, and Jamaica's Yohan Blake, to 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)

Jamaica's Usain Bolt, left, prepares to pass United States' Justin Gatlin, center, and Jamaica's Yohan Blake, to 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)

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