What's so dirty about that fight? It was legitimate, neither was physichally dirty from what I could tell, no dirty tactics (Vitali should have probably held more even). I don't understand what you mean by dirty, and how that fight is the dirtiest in history....
I don't know about old time fights, but Cristobal Cruz vs. Jorge Solis was easily the dirtiest fight I've ever seen in real time. Headbutts, low blows, sumo throws, eye gouging, hitting behind the head, leading with the head, grabbing arms, pushing, clinching, rounds lasting for 5 minutes, guys slipping all over the place, people throwing things in the ring. On top of it, Cruz walked into the ring accompanied by a midget dressed in full Aztec garb, which has to be SOME kind of infraction.