IMO Mayweather still has a lot more to prove, he is without doubt the best defensive boxer i have ever seen, he has managed his career well, avoiding the likes of Tszyu, Mosley, Cotto, Margarito and a well timed retirement just as Paul Williams becomes a dominant force? He still has good wins over Castillo, Corrales, DLH and Hatton. Pacquiao has done it all, coming from Flyweight!! His last 4 fights define his career with wins over Marquez, DLH, Hatton and Cotto. Many on this forum gave him little chance against DLH (me included) he then destroys Hatton in 2 rounds with a text book left hook, he then goes up against the solid, big hitting Cotto who many believe should still be undefeated after Margogate! How high would i rank him if he beats Floyd? Top 20 ATG for certain, he is pretty close to that now! Floyd needs to beat Manny convincingly to achieve the same recognition. Currently i have Manny ahead of Floyd. I reckon Floyd has more to lose here in a fight with Pacquiao.