I'd have to say that Andrew Golota has to be one of the top ten dirtiest fighters in boxing not only of the last twenty years but ever, he would feel no way about mauling and headbutting in the heat of battle even when winning the bout, comboing an opponent downstairs and even had the audacity to pretend he didnt do it. Who have you got?
Miguel "Nutsack Puncher" Cotto Floyd Mayweather loves pushing people's heads down (Ellerbe taught him well) with gloves, arms, and elbows. :-(
Golota is one dirty ****er, was watching him vs bowe 2 yesterday, really can't get my head round why he threw the fight away was ahead on all scorecards and comfortably dominating bowe. He's obviously of his ****ing rails.
Ruiz - his entire career is based on violating the rules against excessive holding and other disreputable tactics like faking "low blows"