Usain Bolt

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Jamaica's Usain Bolt, right, goes to cross the finish line ahead of United States' Justin Gatlin, second from right, and Germany's Martin Keller in the women's 4x100-meter relay final at the World Athletics Championships in the Luzhniki stadium in Moscow, Russia, Sunday, Aug. 18, 2013. (AP Photo/Matt Dunham)

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Jamaica's Usain Bolt celebrates after winning gold in the Men's 100-meter final at the World Athletics Championships in the Luzhniki stadium in Moscow, Russia, Sunday, Aug. 11, 2013. (AP Photo/Alexander Zemlianichenko)

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associated press Jamaica’s Usain Bolt finished 6 for 6 in Olympic finals, with victories in the 100 meters, 200 meters and 400-meter relay in each the London and Beijing Games. In the process, he became the first to win the 200 meters twice.

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Jamaica's Usain Bolt leads United States' Ryan Bailey to win the men's 4x100-meter relay final during the athletics in the Olympic Park during the 2012 Summer Olympics, Saturday, Aug. 11, 2012, in London. Jamaica set a new world record with a time of 36.84 seconds.(AP Photo/Anja Niedringhaus)

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Jamaica's Usain Bolt gestures as he crosses the finish line to win gold in the men's 200-meter final during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Thursday, Aug. 9, 2012. (AP Photo/David J. Phillip)

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A bottle lies on the track behind the starting blocks after being thrown from the crowd as, from left, Jamaica's Usain Bolt, United States' Justin Gatlin, Jamaica's Yohan Blake, United States' Tyson Gay and Jamaica's Asafa Powell compete in the men's 100-meter final the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Sunday, Aug. 5, 2012. (AP Photo/Martin Meissner)

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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/Lee Jin-man)

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Jamaica's Usain Bolt reacts after a men's 100m semifinal heat during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Sunday, Aug. 5, 2012. (AP Photo/Matt Slocum)