what round would floyd stop Matthew Hatton

Considering Floyd outclassed Magics big brother and dispatched him via a brutal KO inside ten rounds, how many rounds will it take Floyd to take out Matthew considering his brother was in a different league. Although Matthew is a resiliant little fighter, and a natural welterweight i still think Floyd will have an easy night at the office. If the fight happens i think a Floyd fourth round stoppage and then that will add to ricky's motivation to get in there again with the pretty boy and go out with millions of pounds.