The battle of Ali vs. Frazier is one of the most ruthless rivalries in Sports history, and it changed the world of professional boxing. It differed from other Sports rivalries, probably because these two gladiators were beating the living crap out of each other continuously for four years. The rivalry cut deep for both Ali and Frazier, who still talk crap about one another to this day. Do I smell a rematch?
Famous Rivalries 