I completely expect Mayweather to win a fight against Pac. In another thread, a thread in which I intellectually demoralized the very starter of this thread, I posted studies showing that African Americans have the lowest IQ among American citizens. And the reason for their lower test scores is not because of cultural bias or economic disadvantages, as one might be inclined to think.
Blacks simply have a smaller brain size. But with that smaller size also comes a much thicker skull and an instinctual aggressiveness that can be described as bestial. For a professional boxer, qualities like these are a tremendous advantage. His thick skull will effectively protect him from being easily knocked out while his bestial nature will produce in him an animal like tenacity that no ordinary non-negro man will be able to deal with.
It's why blacks are, by far, the best boxers in the world.