At 147 pounds i think mayweather would beat Hatton comfortably, at 140 i think hatton would beat mayweather comfortably. My reasons for thinking this are as follows....

Ricky hatton never let kostya tszyu get enough space to allow his punches to flow, at 140 pounds i think he would do the same to mayweather. Mayweathers speed would not be able to be displayed and used effectivly enough to win him the fight if he is being tied up and smotherd by hatton. Mayweathers power would not be a problem if hatton lasted tszyu's.

As seen at 147 pounds, ricky hatton could not impose his natural strength on luiz collazo and push him against the ropes where he could barricade with him with punches, he therefore (in my opinion) lost the the fight. although mayweather is not a natural at 147 pounds like collazo, the 7 pounds does make a significant difference at this level and would give mayweather the edge to win. He could avoid being tied up and use his dominating speed and accuracy to beat hatton.

basicly, Ricky hattons style is very effective if the power is there to support it.