Hagler, decisively! Talk about overrated! Hurricane is a misnomer for that dude. Dick Tiger made him look like a gentle breeze!
As with most here I can't see Carter making it close, Marvin simply boxing his way to a clear decision. I don't think Hagler would try and tee off on Reuben though, Hagler had a history of being careful against those with strong reputations (Vito, Duran, Briscoe, etc.).
Carters career was erratic as hell. The one that showed up against Griffith Fernandez and Benton was a hell of a fighter. Fast powerful ect. That Carter can make it interesting.
Hagler as the Champ should win. Prime Carter would beat the Hagler who lost to Wilie the Worm, and maybe even the Hagler who turned off the gas in the "Vito Antuofermo I" fight.