I'd expect Floyd to win. He'll outmanouver Cuevas I reckon, though Cuevas will give him some periods of near Hell. Floyds defence will have to be at it's best, or at least his range will have to be, staying away from Cuevas rather than fronting him like he did Shane. Cuevas hitting Floyds shoulder or arms as he bloks is going to trouble Floyd. He was a demonic puncher. Floyd should just jab his head off, occasional right hand sharpshoot. Because Cuevas is not Marquez, I expect it'll be a competitive enough fight, even if it is 118-110 on all cards to Floyd. Mosley is still in peoples heads. Don't forget Castillo 1.
As with SRL, Floyd's defensive abilities/speed help him tremendously, but Pipino's power is ultimately too much for him. The best Mayweather can do is go into a defensive shell.