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(L) Singer Justin Bieber Holds Getty Images

LAS VEGAS, NV - MAY 05: (L) Singer Justin Bieber holds up a belt for Floyd Mayweather Jr. before Mayweather Jr. takes on Miguel Cotto during their WBA super welterweight title fight at the MGM Grand Garden Arena on May 5, 2012 in Las Vegas, Nevada. (Photo by Al Bello/Getty Images)

Most outrageous, controversial moments of Floyd Mayweather Jr.'s career

April 30, 2013

Mayweather's antics have made him the hottest pay-per-view draw in boxing, but he's made plenty of enemies and caused plenty of headaches along the way. Will we see another controversial moment on Saturday when the mercurial star fights Robert Guerrero?

Mayweather's least favorite thing to do | Key wins | 'Money' bloody before fight