I'd go with Mancini. Floyd is obviously faster and more talented, but Ray is stronger and hit harder and, more importantly, he was a natural at lightweight. Floyd's at his peak best at 147. I could smell a smashing knockout win for Mancini here.

Mayweather was/is superior to Mancini in every comparable category, Floyd would be the heavy favorite and Ray a serious underdog.

Big Mo,

I had a fighter that sparred with a Prime "Boom Boom" my fighter "Santana D" dropped him with a body shot in the fourth round of sparring. Ray fought only one way and that was straight ahead with very little head movement and his footwork was pretty much nonexistent. This would play right into Floyd's Tuck and Roll Style which primarily works when a fighter follows you to the ropes.

Floyd would lay back and counter "Boom Boom's" wide hooks all night long and tear him up very similar to the way the great Alexis did. Floyd would use his left elbow as a effective weapon as he has done in pretty much every single one of his fights up until this point. The straighter shorter shots would take their toll on Ray.

The on thing that Ray did have in his advantage in a fight he would full of disadvantages would be Power, and he might get lucky and catch Floyd with a shot. But luck and Horseshoe's go together not so much in boxing. A Prime "Boom Boom" would apply relentless pressure but his lack of angels would be his downfall.

Thanks Big Mo.

This would be Mayweather vs Gatti Part II.

Floyd would DESTROY Mancicni. He's too small, his defense is too bad, and he's literally inferior all around to FMJ.

Mayweather would hit him at will, and Mancini would get stopped in the corner or have the ref wave it off after like six or seven rounds due to the horrible punishment he was taking.

If Mancini couldn't beat Livingstone Bramble in two fights, there is no way he could beat Mayweather.

Floyd would kill Ray I have personally seen a lot less fighters give Ray the blues .