Country: United States
Sport: Track & Field (4x400m Relay, 200m)
Best Finish: Gold (2008 Beijing)

Felix has that particular athlete's smile you see after a race (which she usually wins)—spent, flag draped across her shoulders, pure toothy happiness. Then again, if you were a three-time Olympic medalist and the only woman to be a three-time Athletics World Championship gold medalist for the 200-meter distance, you'd be smiling too.