The boxer is projected to make $90 million in 2013 according to Sports Illustrated's annual list released Wednesday. Miami Heat star LeBron James is a distant second at $56.5 million.
New Orleans Saints quarterback Drew Brees vaults into the rankings at No. 3 at $47.8 million thanks to a new contract signed before last season. Kobe Bryant of the Los Angeles Lakers is fourth at just under $47 million.
Tiger Woods is fifth with $40.8 million, his lowest spot since SI started the list in 2004. He was No. 1 through 2011.
Cincinnati Reds first baseman Joey Votto of Toronto is 45th at $19.2 million.
The top 50 include 25 baseball players, 13 basketball players and eight football players, with no female athletes for the fifth consecutive year. There are no hockey players on the list.
The estimates combine salary, winnings and endorsements.