I actually think he would beat all 3. Not 100% on that but his defensive ability and counter punching brilliance would cause hell for both Duran and Hearns. Leonard would be the toughest one to call but I think Mayweather would cause him serious trouble with his elusiveness and then his own great speed. I know Leonard would probably have the edge in speed overall at WW but his timing wasn't as good as Mayweathers. This for me would be the hardest fight to call in the history of the WW division (at world level that is) but i'm going Mayweather.