hagler would have killed him period.
hagler was a bruiser who never stop coming like frazier was, but stronger and better shape..
against the hit man he might have would on points
sugar ray leonard would have beat him
duran was a bruiser also.. so that would be close
1. He'd never fought Hagler because Hagler was a career middleweight and Floyd has never fought once in that division.
2. Hearns would be his toughest fight at Welter, with with his height, reach, speed, boxing ability and natural power. Not sure if Floyd could beat him.
3. I think a fight with Leonard would be a toss up and Floyd could outbox Leonard, while Leonard could hurt Floyd with his power and speed.
4. Floyd would box the shyt out of Duran.