Eleider Alvarez vs Artur Beterbiev

They're stablemates I'm sure they would've sparred many times with each other.

They actually share numerous common opponents in the pros (and obviously they've both shared a ring with Kovalev, albeit Artur fought him in the ams)

Alexander Johnson
Rayco Saunders
Alvaro Enriquez
Isidro Ranoni Prieto

Beterbiev did much better against all of them

WTKO7 Johnson
WRTD3 Saunders
WTKO1 Alvarez
WTKO1 Prieto

Now Alvarez's

WUD10 Johnson
WUD8 Saunders
WUD4 Alvarez
WUD12 Prieto

Obviously that doesn't mean Beterbiev beats Alvarez but it does give you an indication of the kind of power Beterbiev possesses and we're talking absolute wrecking ball power which is generated from very short distances.

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The tough, hard punching Argentina based Paraguayan Isidro Ranoni Prieto gave Alvarez a real tough fight and he hurt him numerous times. He hurt him at the end of the first and had him in big trouble in the 6th round. Alvarez hit Prieto with everything but didn't come close to budging him.

Here's the fight

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Here's Beterbiev vs Prieto has only lost to Alvarez and Beterbiev and AFAIA he'd never been off his feet before he ran into Beterbiev. He's a very durable guy and a good fighter.

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Look at the expression of bewilderment etched across Prieto's visage as he's kneeling on the canvas after being dropped seconds earlier by a vicious Beterbiev right.

Beterbiev was also a much better and much more decorated amateur than Alvarez was (the later was a good one too, though) and unlike both Kovalev and Alvarez he doesn't have any KO loses on his ledger in the unpaid ranks either. Alvarez is a very good all rounder but Beterbiev's more sturdy and durable than Kovalev, has a much better gas tank, and what with him being a devout Muslim he doesn't have any of the bad habits Kovalev has out of the ring either. He trains like a Spartan and there's more chance of a toddler being able to stand up to a flush right hand of his than there is of him slacking in the gym.