I do. Hagler faced everybody, and was in one of the best middleweight eras ever. He beat Thomas Hearns who was thought to be invinsible. Much like Sonny Liston, Joe Louis, George Foreman, and Mike Tyson. Hagler was like Frazier, rather short for his weight class and would come at you ducking and weaving throwing 100 punches a round. Roy Jones Jr was duck, so I doubt they would fight even if they were in the same era. RJJ might win the first or second round, but after that it would be lights out for him. Hopkins could slug it out, but I don't know how he could handle the pressure Hagler woulkd put him under.