I think the one thing above all others that makes MAyweather win this are his 26 inch arms, and his stiff jab, I know it hasn't looked as still against monsters like De La HOya and Baldomir, but remember that stiff jab he used to prominently in his prime against Corales, Castillo, etc? It is too fast and fast for Marquez to counter over, Mayweather is too good at dictating the pace with it.