Someone like Hagler? Who ruled the middleweight division, genuinely ruled it, for 11 years? No way Pacquiao is on Hagler's level as of right now imo simply because of that longevity factor. That's not to undermind what Pacquiao has done but damn that's a rough one.

It depends when it happened, if he cleaned out the welterweight division that would be very impressive. If he did beat Mayweather that would be one of the greater achievements in boxing history. Definitely modern boxing history.