Best examples of overcoming a significant size and power disadvantage

Spinks beating Holmes, albeit with Holmes career stage taken into account. It was still a monumental upset, because Spinks was stepping straight from 175 to Heavyweight.

 

Usyk vs AJ

 

And Dubois. And while Fury is not known as a puncher I think he has power when he sits down on his punches. And he course dwarfed Usyk.

So Usyk is the giant slayer for mine.

 

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Half of Mickey Walker's career.

 

Byrd vs Vitali
Duran vs Barkley
Young vs Foreman
Holyfield vs Foreman

Qawi at 5'6 was routinely beating fighters 6'0 and above.

 

Dempsey v Willard - the king of them all.

 

James J. Woody at 6'0 beating James Beattie who stood 6'9 1/2" and had 40 pounds on Woody. To make matters worse for Beattie, Woody stopped him in the rematch.

 

Except for Byrd v. Vitali and Holyfield beating a slow, old man.

 

Mayweather--Canelo
Crawford--Canelo
Hunter--Bakole
Orlin Norris--Oliver McCall

 

Well one of your examples I don't really agree with either.

Crawford is taller than Canelo with a 4 inch reach advantage.

And despite what people said about the size difference there was very little evidence of that and Crawford comfortably walks around at 180.

Despite Foreman’s age he was still a very big powerful imposing Heavyweight with a 49 pound weight advantage over Holyfield.

Byrd had a weeks notice fighting Vitali in his backyard and overcome a 6 inch height disadvantage, 30+ pound weight disadvantage.

 

Oleksandr Usyk vs Tyson Fury 1 and 2. Fury with the 6 inch height and 7 inch reach advantage along with 39 pound difference in the first fight and 50 pound difference in their second.

Manny Pacquiao vs Antonio Margarito. 5.5-inch height and 6-inch reach difference between the two. Margarito also had 17 pound weight advantage.

 

You haven't seen Crawford in person. I've been to two of his fights. You're wrong unless we're talking about reach classes, in which case Tyson is the GOAT.

Foreman beat one guy in the top ten in his comeback and was an underdog and challenger. It's a weak example.

Byrd was hopelessly behind on the scorecards and VItali retired with a serious shoulder injury for which there is no video evidence of Byrd causing with slick pixie dust. It's a poor example.

 

I thought about Pac vs. Margarito. I think the level of power was pretty similar between them though.