They are at the top of their game and are now set to take on the rest of the world. Keep reading to see some of the athletes already announced to compete on behalf of the United States at the 2012 Olympic Games in London, and keep checking back as new names are added. —Britt Middleton.
LaShawn Merritt. Track and field: 400 meter dash
Gold medal in 2008 Olympic Games in 400 meter and 4x400 meter relay.