Hagler V ?

Bob could Take what Hagler dished out, I'm not sure the other way over 12/15, but he definitely couldn't over 20. Bob KOs him at some point after 16.
In fact I think it's seriously unfair to put Bob in at MW with anyone over 20.

Bob KO17

Hagler stops Ketchel, he always did well with Brawlers and would stop Ketchel by pure accumulation.

Hagler TKO10

I don't think either fought 20 rounds, but I'll speculate and say that Greb could keep up that type of workrate. He also has one of the best chins of all time. He'd take Hagler's best imo. And would outhustle Marvin over 12/15 or 20. This fight would make Gatti Ward look like a stinker.
Greb UD20

Absolutely brilliant fight, Steele for me is quite underrated and would represent Hagler's best win. I think Hagler would have to trade with Steele as I don't think he could outjab Steele. I think Freddie would allow Hagler to make a scrap out of it and take him in the trenches, only to find how tough Marvelous Marvin Hagler was. Not saying Steele wasn't tough, he's tough enough to go the distance but not outtough Hagler.
Hagler UD15

A pretty one sided beatdown imo, Hagler would man handle Jake. I see Lamotta as a good/very good fighter with an ATGs number. Like Ken Norton and Ali, Marquez and Pacquiao or Mosely and Forrest. Hagler would jab him to death and rough him up bad on route to a wide UD

Hagler UD15

Hagler beats Robinson, have said it since day and will continue to. Hagler has the jab to offset Robinson and plenty of power to make his body weary and take away his legs, I feel that Hagler would take the advantages Lamotta had and use them better. The fact he is the bigger guy and a southpaw doesn't help Sugar Ray.
But his granite chin and toughness do, he lasts the distance.
Hagler UD15

Seriously hard fight to pick. Monzon would have the better jab and was as powerful imo, Hagler as a southpaw would have some advantages with his feet but I don't think he'd use them like he should, he wasn't exactly Pernell Whitaker at that. I think he'd let Monzon take the fight to the position he wants, his foot on the outside. He'd then be able to move outwards at will and jab or throw his right hand take Hagler head on. Personally I think he mixes it up and does both. I think this would resemble a GGG Canelo 2 type decision where there's a case either way.
Hagler never really got lucky with the judges, but he definitely forces Monzon to the absolute edge. There would be no KO

Monzon UD1,5

I think Hopkins wins, he was the southpaw killer and was an excellent fighter in terms of managing the distance and setting up his right. I think he'd beat Hagler should he not fight stupid. I think he'd beat Monzon as well. Hopkins was a very very good middleweight and was brilliant at setting up punches that his opponents didn't see coming, he was also good at winning rounds and has a brilliant set of whiskers. I don't think Hagler takes it.
Hopkins UD12

Hagler seems to go 4-4

 

Greb based on resume and distance
Monzon on points.
I have him beating the rest.
Personally I thinks he whips Hopkins

 

Greb fought 3 20 round fights against a few nobodies, but his favorites were definitely the 10-12-15 rounders

 

Hagler KO rounds 12-16 Fitz

Hagler TKO Ketchel

Hagler UD Steele

Greb UD Hagler

Hagler SD LaMotta

Hagler TKO rounds 12-15 Robinson

Hagler UD Monzon

Hagler beats the **** out of Hopkins

 

Me too. Hopkins can be a bit overrated at middleweight in my view. Don't get me wrong, I think he's an all-time great at 160, probably deserves a top 10 spot and his win over Trinidad in 2001 was mightily impressive. But equally, he ruled over a declining division where most of the best talent had performed a mass exodus up to super middleweight by the mid-90s and his long title reign benefits from largely mediocre competition which he spent a lot of that time not looking particularly great in beating. Before Trinidad he was a long reigning belt holder like Virgil Hill at light heavyweight. A guy who nobody really thought was an ATG. He really needed the win over Tito to elevate him.

Had he being at title level a few years earlier, I think his record at the weight would have been a lot spottier.

Hagler by dominant UD.

 

Keep one thing in mind folks when comparing Hagler to all the greats before him, Vito Antuofermo, a cutter with no punch, fought the great Hagler to a draw. Let that sink in. Antuofermo was only half the fighter LaMotta was. At the same time, LaMotta could be hot and cold and there were guys he lost to, (or should have lost to) that Marvin probably would have beaten. Roberto Duran was a blown up lightweight and smaller man who fought Hagler close. Marvin looked uneasy and did not look that great in that fight. Having said all that, Hagler was still a great fighter no doubt. Fantasy match ups are hard because there are so many variables... We will never know...