What fighters would absolutely not let you tie them up, punching free of clinches and or manhandling you on their way out? Tzysu might be the best recent example of this. He treated his opponents like they all were carrying the plague. Colin Jones in one of the Laing matches. Elbows, forearms... Was hiting Laing with everything punching out of the clinches when he had him hurt.
http://www.youtube.com/watch?v=gXivXNvb780 http://www.youtube.com/watch?v=TjlQCTfwNPA Wouldn't say he did it all the time, but I think Monzon sufficiently made it clear that he didn't like clinching.
Billy Graham. EDIT: Nevermind, I misunderstood the topic, I thought it meant who was the best at fighting in clinches.
Sonny Liston would manhandle you in the clinches. Also Rocky Marciano vs Ezzard Charles I, the refereee did not have to break them up one time in 15 rounds. How impressive is that!