Olympians Before They Were Stars

Dana Vollmer

United States, 2004 Olympics

The youngest competitor at the 2000 Olympic trials (12), Vollmer made the Olympics as a rising high school junior four years later and won a gold medal as part of the 4x200 free relay and placed sixth in the individual 200 free. She's become the best 100-meter butterfly swimmer in the world and will be favored to win gold in London.