James Toney could and wouldn't even blink, while getting hit by Marvin, but Toney probably would gas, Middle weight was his weakest weight class, but James would go, 12 full rounds with Hagler, maybe not 15.
Mike MacCallum could go toe to toe, 15, rounds, he took James Toney"s, punching power and
Julian Jackson, could go, toe to toe with Marvin and would encourage it, but Julian, Jackson's chin wouldn't hold up.
Gerald McClellan could, he was going toe to toe, with everyone at the time of his championship years, he was practically going up against monster punchers, until he got hurt really bad. Gerald was bigger and stronger then Hagler and wouldn't even back up.
Julio Cesar Chavez jr, due to his massive size advantage and weight advantage, Chavez jr, could go toe two toe with Hagler, would he win? hell no. Chavez would get out pointed by Marvin Hagler, Marvin would be to busy of a fighter to lose to Chavez jr. Hagler isn't knocking Chavez jr out, no way in hell. But Jr isn't catching Marvin either, Hagler"s work rate is to high for Jr to handle.
Gerald McClellan vs John 'The Beast' Mugabi
Julian Jackson vs Gerald McClellan 1
Julian Jackson vs Gerald McClellan 2
Mike MaCcallum vs Roy Jones jr.
Chavez jr vs Sergio M.