Usain Bolt IMAGE.
Tyson Gay of the U.S., Usain Bolt of Jamaica and Asafa Powell of Jamaica (L-R) stand on the winners podium during the awards ceremony for the men's 100 metres at the world athletics championships at the Olympic stadium in Berlin in this August 17, 2009 file photo. Bolt won gold  in a time of 9.58 seconds setting a new world record, ahead of Tyson Gay of the U.S. who won silver and Powell who took bronze.

Tyson Gay of the U.S., Usain Bolt of Jamaica and Asafa Powell of Jamaica (L-R) stand on the winners podium during the awards ceremony for the men's 100 metres at the world athletics championships at the Olympic stadium in Berlin in this August 17, 2009 file photo. Bolt won gold in a time of 9.58 seconds setting a new world record, ahead of Tyson Gay of the U.S. who won silver and Powell who took bronze.