Mary Decker, Orange HS, Orange, CA
Mary Decker (later Decker Slaney) is the original high school phenom. The middle distance star set her first of 17 world records at 14 years old with a 4:40.1 indoor mile, but was deemed too young to compete in the 1972 Olympics. She went on to compete in four Olympic Games and set a total of 36 American records in every distance from the 800 meters to the 10,000 meters. She still holds the American standards in the 1,500m (3:57.12), mile (4:16.71) and 3,000m (8:25.83). Decker Slaney was named Sport Illustrated's Sportsperson of the Year in 1983 after winning both the 1,500m and 3,000m at the inaugural IAAF World Championships in Helsinki.
Photo via @BringBackMile on Twitter