Threads like this highlight the stupidity of an awful lot of posters here. Firstly, they all point to the TWO KO's of Pac's career, wherein in BOTH times, Pac was dangerously dehydrated (even already lost the belt before the match began) and was floored by a body punch in one KO, ergo, not a "chin measure". Secondly, they all think that Mayweather, arguably the slickest boxer that has graced the planet has been tested enough in this department. AND they all seem to disregard the fact that when May's chin was actually tested, he wobbled, got knock down (touching the floor is a KD) or at least reacted badly to it AT THE MOMENT he was hit. Thirdly, recuperative ability does not equal a granite chin. JMM for instance has average to poor chin but his recuperation is excellent. If the way Pac shrugged off the best punches of Cotto, Hatton, Clottey and Margo is not a measure of his chin's strength, and if you think Floyd will be able to withstand it BETTER had he been the one eating 'em up, then you are all ******s.