Mayweather could easily take a UD if he stayed centre ring, but he's not been doing it recently. Still favour him slightly with back on the ropes, but I feel Marg will be more effective than those guys in that position, particularly when he throws four/five consecutive lefts as Floyd likes to shift from side to side when defending those combinations (+ Marg does damage hitting arms/shoulders, whatever gets in the way of his punches.).

Saying that, I wouldn't bet against Floyd making the necessary adjustments.