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After landing an unprecedented $32 million per fight deal with Showtime, boxing legend Floyd (Money) Mayweather Jr. finds himself on top of the 10th annual <a target="_blank" href="http://sportsillustrated.cnn.com/specials/fortunate50-2013/index.html">Sports Illustrated Fortune 50 list</a>. The list ranks the 50 highest-earning professional athletes in the U.S. Here are the top 20 money makers in professional sports as ranked by S.I.<br>(Reuters)

S.I.'s top earning athletes

After landing an unprecedented $32 million per fight deal with Showtime, boxing legend Floyd (Money) Mayweather Jr. finds himself on top of the 10th annual Sports Illustrated Fortune 50 list. The list ranks the 50 highest-earning professional athletes in the U.S.

Rafael Nadal celebrates after winning the men's final against Roger Federer at the Rome Masters May 19, 2013. (REUTERS/Alessandro Bianchi)

Nadal, Williams win

Rafa Nadal made short work of his great rival Roger Federer to win the Italian Open, his sixth trophy of the year, 6-1 6-3 on Sunday.

Oxbow with jockey Gary Stevens (C) leads the pack to take first place at the 138th running of the Preakness Stakes at Pimlico Race Course in Baltimore, Maryland May 18, 2013. (REUTERS)

Oxbow wins the Preakness Stakes

Oxbow, a 15-1 longshot ridden masterfully by 50-year-old Hall of Famer Gary Stevens, cruised to an easy, wire-to-wire victory in the $1 million Preakness Stakes on Saturday.

Roger Federer hits a return to Benoit Paire during their men's singles semifinal at the Rome Masters May 18, 2013. (REUTERS/Tony Gentile)

Nadal-Federer in final

Roger Federer will meet great rival Rafa Nadal in the Italian Open final after the Swiss held off a spirited challenge by unseeded Frenchman Benoit Paire on Saturday.