If you don't know who Collins is: he took power shots for 10 rounds from a guy who had plaster of Paris on his knuckles, and most of the padding taken out of his gloves. A legendary jaw. I didn't include Vitali Klitschko here because he ducked too many top contenders to be taken seriously.
I'd go with LaMotta because not only could he stand up to single big shots, but also showed he could take sustained punishment to the head from a big hitter in Ray and stay on his feet. And this was when he was tired, and also got hammered to the body. The body was killed, but the head didnt fall.
David Tua. Eddie Chambers. Ruslan Chagaev. Hasim Rahman. Evander Holyfield. Chris Byrd (never demanded a rematch!) Enough? I could go on with another ten names at least. His career has been a big cherry-picking adventure. Lennox wanted no part of Byrd either. Who needs an opponent who is in shape and can move quickly?
This content is protected He went into a depression after losing the fight by decision, and died in a car accident.
Chuvalo, but McCullough and McCall deserve to be in the discussion. Pocket Rocket fought much harder punchers than Hagler over the course of his career, relatively speaking, plus he had a penchant for blocking punches with his face, and he never went down. Obviously I wouldn't disagree with Lamotta either. Marion Wilson is another guy who never gets enough credit in these threads. Went 12-41-4 in his career as an opponent for a ton of top heavyweights (McCall, Rahman, Thompson, Maskaev, Sanders, Wolfgramm, Ibeabuchi, Golota, Briggs, Mercer, Bean, Botha, Mavrovic, Williams, Sellers), and only went down once in his career, to Jimmy Thunder, all despite usually weighing in at the 190 - 210 pound range.