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Clive Brunskill/Getty Images
Power 100 rank: 80
Sport: WTA Tennis
Most recent notable achievement: Won 2008 Australian Open
Earnings: $23.9 million
Key sponsors: Tiffany, Canon, Land Rover, Nike
Why she's on the list: Sharapova is 24 months removed from her last Grand Slam title, but her physical beauty has landed her more corporate sponsors than any other athlete. Earlier this month she signed a $70 million deal with Nike.