Sorry to get back on track here, but as a fan of Hagler I still say it's one of those ones that's too cloase to call over Monzon. Like lots of these debates it all comes down to personal preference of a fighters skills and style coupled with his record and list of opponents.

Dealing with a what if scenario I think it's a pick 'em fight between these two but there is an obvious argument for either of them claiming title of best ever.