Judah will hit Mayweather with something very solid very early in the fight.
Mayweather takes it, but it rocks him.
Judah gets over confident and becomes aggressive.
Over aggressive Judah swinging wildly gets picked off by Floyd easily for a few early rounds.
Near the middle rounds, Floyd starts advancing forward more and more against a less confident Judah.
Judah can't fight moving backwards and fight gets stopped either by ref or corner in round 7 or 8.

I'll bet money on that scenario.