Who would win this bout under modern day rules and why?

I would say Marvin Hagler, in my opinion Sugar Ray Robinson isn't as good in the ring, Marvin would kick ass

Marvin, there is no question about it!!! He's much better!

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you're telling me this guy 'isn't as good in the ring'? At his height, if I had to choose between him and a freight train, I might pick the freight train but I'd have to think about it for a while.

Ok what about Roberto Duran V Floyd Mayweather.....aggression v speed,

I think you have to go with Robinson here. Hagler was beatable, even in his prime. Robinson, however, was invicible.

Obviously both fighters are quality boxers...But I think Sugar Ray Robinson would take him. Dont get me wrong, Hagler is an excellent fighter too...But my previous opinion still stands.

Sugar Ray Robinson was a man that you could only possibly knock out by making him fall from loss of blood, killing him, or making him collapse from heat exaughstion. Sugar Ray Robinson was a man whos determination always kept goin, he always kept punching, and he was fast enough to catch Pretty Boy Floyd himself. He was one of the hardest punching middleweights ever lived. This guy was nearly unbeatable in the ring. IMO Robinson can beat any modern fighter today. Anybody in the shape that they are in today, would not be able to beat Sugar Ray Robinson.