Usain Bolt is the world's fastest man and will undoubtedly be one of the main attractions in London for the 2012 Summer Olympic Games.
But, it was the United States that claimed the highest medal total in the athletics competition in 2008.
In just a few days, the US Olympic Team Trials for track and field will begin in Eugene, Ore., one of the running capitals of the world.
After the trials, we'll know exactly who will be representing the red, white and blue in London.
Those who follow track or the Olympics are aware of the well-known Americans like Tyson Gay, David Oliver, Allyson Felix, Carmelita Jeter and the other track stars who have already claimed world championships, broken national records and brought home Olympic medals.
So, let's forget about them for a minute and have a look at some of the other Olympic hopefuls who will be shocking us with their speed this summer.