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

Pop star Justin Bieber holds up Floyd Mayweather's belts before his fight against Miguel Cotto.

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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?

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