Michael Phelps

JOHN MACDOUGALL/AFP/Getty Images

Michael Phelps

Power 100 rank: 7
Sport: Swimming
Age: 24
Most recent notable achievement: Eight gold medals at 2008 Beijing Games
Earnings: $6 million
Key sponsors: Subway, Speedo, Omega Watches

Why he's on the list: One year later, Phelps continues to shatter his own world records, and with the memory of his Beijing performance still fresh, most sponsors were reluctant to drop the 24-year-old despite photos of his marijuana use.