Although Hagler would definately win a UD as I agree he is greater, I think it's almost disrespectful to Hopkins to think he would be KO'd or TKO'd, as he never showed any signs of coming anywhere near being knocked out or stopped in his entire career. He has one of the greatest chins in boxing, and contrary to popular belief that he is only crafty, he has taken hard shots and pressed on. If Duran can go 15 rounds with Hagler without even getting decked, Hopkins would certainly do the same.