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Floyd takes low-blow from Zab Judah.

Zab Judah's low-blow enraged Floyd Mayweather's uncle, Roger, into a full-on assault in the middle of the boxing ring, but Floyd stayed cool throughout the incident. (Getty)

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

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