Jamaica's Usain Bolt reacts to his win in the men's 100-meter final during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, August 5, 2012 (AP Photo/Anja Niedringhaus).

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 (AP Photo/Anja Niedringhaus).

Jamaica's Usain Bolt, second left, crosses the finish line ahead of United State's Ryan Bailey, left, United States' Justin Gatlin, second right, and Jamaica's Yohan Blake, right, in the men's 100-meter final during the athletics in the Olympic Stadium (AP Photo/Anja Niedringhaus).

Usain Bolt reacts to 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/Anja Niedringhaus)

Usain Bolt celebrates winning gold in the men's 100-meter final during the athletics in the Olympic Stadium at the 2012 Summer Olympics (AP Photo/Sergey Ponomarev).

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, at the 2012 Summer Olympics (AP Photo/David J. Phillip ).

Usain Bolt, right, celebrates winning gold in the men's 100-meter final alongside silver medallist Yohan Blake of Jamaica at the 2012 Summer Olympics (AP Photo/David J. Phillip ).

Usain Bolt, third from left, crosses the finish line to win gold ahead of United State's Ryan Bailey, left, Jamaica's Yohan Blake, third from right, United States' Tyson Gay, second from right, and Trinidad's Richard Thompson in the men's 100-meter final at the 2012 Summer Olympics, London, Sunday, Aug. 5, 2012. (AP Photo/Matt Dunham)

Usain Bolt, left, celebrates winning gold alongside silver medallist Yohan Blake of Jamaica following the men's 100-meter final during the athletics in the Olympic Stadium at the 2012 Summer Olympics (AP Photo/Sergey Ponomarev).

A bottle lands on the track after being thrown from the crowd as, from let, Jamaica's Usain Bolt, United States' Justin Gatlin, Jamaica's Yohan Blake, Jamaica's Yohan Blake, and United States' Tyson Gay start in the men's 100-meter final at the 2012 Summer Olympics (AP Photo/Martin Meissner).

Usain Bolt celebrates winning gold in the men's 100-meter final during the athletics in the Olympic Stadium at the 2012 Summer Olympics (AP Photo/Daniel Ochoa De Olza).

People cheer as they watch Olympic sprinters Usain Bolt and Yohan Blake competing in the 100 m dash at the London Olympics on a large TV screen set up at the national stadium in Kingston, Jamaica, Sunday, Aug. 5, 2012. A crowd of roughly 500 people on the grounds of the national stadium cheered wildly as Bolt crossed the finish line of the 100-meter dash in 9.63 seconds, many dancing and chanting (AP Photo/David McFadden).

A drummer performs as people watch Olympic sprinters Usain Bolt and Yohan Blake competing in the 100 m dash at the London Olympics on a large TV screen set up at the national stadium in Kingston, Jamaica (AP Photo/David McFadden).

A Jamaican dance crew performs after people watched Olympic sprinters Usain Bolt and Yohan Blake competing in the 100 m dash at the London Olympics on a large TV screen set up at the national stadium in Kingston, Jamaica (AP Photo/David McFadden).

Usain Bolt celebrates winning gold in the men's 100-meter final at the 2012 Summer Olympics, London (AP Photo/David J. Phillip).