I think Floyd beats him by late stoppage or ud. However on a side note, HOW I WISH FLOYD HAD MANNY'S HEART!!!!!!
If Pac does not take a savage, ruinous beating at the hands of a much bigger ODLH, I think he might be able to force a command performance from PBF in an exciting bout which he loses by mid to late KO.
Mayweather would only win by UD or SD. We don't know though how good really is Pac chin but he proved that he could take tons of cuts and punishment and not go down. Mayweather is far more beyond the Kryptonite of Pacquiao. Packy here will only have a puncher's chance.