After Manny Pacquiao's recent destruction of Miguel Cotto, and Floyd Mayweather's recent comeback, everyone's clamoring for the top two active pound-for-pound fighters to go head-to-head. The matchup would, undoubtedly, produce a classic and clear No. 1. Could the victor rank among the greatest pound-for-pound brawlers of all time? Well, the fight needs to happen first. Here's a look at some of their landmark bouts to date.