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Scott Halleran/Getty Images
Power 100 rank: 3
Sport: PGA golfer
Most recent notable achievement: Won 2009 Tour Championship
Earnings: $52 million
Key sponsors: Rolex, KPMG, Exxon
Why he's on the list: Combine his likability and his ongoing rivalry with Tiger Woods, and Lefty is the perfect pitchman for high-end companies looking to announce they're challenging to be the best in their industry.