Does this footage prove Joyce had a glass chin?

In that clip alone he takes a fair few headshots from a genuine heavy.

And in any case, his recent fights prove beyond all reasonable doubt that he's not at all glassy. His chin is at least average, even for an international class pro heavyweight, and it's probably better than that.

 

I agree he hasn’t been in with a bona fide puncher. But them shots were hard. And he took them without flinching

 

Glass chin? Are you high? The only shot which is a worry for him is the perfectly thrown, full power right hand of Deontay Wilder. Maybe a series of uppercuts by AJ could do it too, but we'll have to wait and see.

 

That was premature? Laughable.

 

So? Getting stopped is getting stopped. Face it, Joe has been stopped.

 

Glass chin lol, he took a full on power shot that knocked him off his feet then got up like nothing had happened. Only reason it was stopped is because of the rules in amateur boxing, that would of never been a KO in the pro's. Even iron chinned fighters get dropped sometimes, Ali, Holyfiled, Froch, even Hagler technically has been dropped before, though it looked more like a slip.

 

He looks to have a much thicker neck, broader shoulders and bigger legs now. Stiverne caught him with some great shots and he took them clean. I'd say he's got a solid chin.

 

Look at Joe's eyes when he got hit in that clip. He was gone.

 

Joyce turned pro at 32, having taken up boxing at 22 and spent a long time in the amateurs, making the run in 2016 and being denied gold by highly suspect judging. Joyce's performance in that tournament was especially impressive because his style and attributes are more suited to the pros. He beat a lot of top amateurs.

He's not especially marketable with his vacant personality so he was never a priority, and his age and perceived flaws just compounded this. The intention was to feed him to Dubois, who was highly rated by Fury, Joshua and the industry in general.

Physical maturity and extra mass can improve chins, many such cases. As you've previously noted about Ruiz, his fat mass helps protect his brain from being rattled. Extra mass absorbs shock, maturity (and people mature at different paces) makes you more robust and reduces anxiety, which can affect punch resistance. But eventually there are diminishing returns, that is biology.

There's no hard rule for "prime" and heavyweights, especially giants and especially in modern times, tend to have later expiry dates. Joyce looks the best he ever has at 37, Ortiz was better in his 30's than his 20's, ditto Wlad, ditto Wilder. Some athletes have extremely late peaks; one 100M sprinter running his fastest ever time and a sub-10 second at that, at 40.

Joyce took some big whacks against an washed up obese Stiverne and a young Dubois, though he was a lot more cautious against Dubois. Clearly a very good chin, regardless of the Kuzmin fight way back then.

Sanchez asserted that Joyce wasn't experienced enough for a post-Wilder 1 40 year old Ortiz in 2019, this was just before the Stiverne fight. So maybe there has been a lack of confidence from certain trainers, rightly or wrongly.

 

Just because he beat Parker doesn't mean he is unstoppable.