Duke McKenzie said Usyk deserves to be in the all-time top 20 [best] heavyweights in the world, but we don't know where he sits in that top 20,"
"Your Fraziers, Foremans, Alis - then you have Lennox Lewis, your Tysons, Riddick Bowe, your Evander Holyfields, there's a lot of guys that would've given Usyk a lot of trouble that aren't the real big names."
Spencer Oliver chimed in: "Someone like Joe Frazier, who was relentless, but was a little bit predictable... Someone like Usyk who had that skill set, and you're talking about size and all that, you have to put Usyk as a massive favourite over Frazier.
"Usyk puts his name in that argument, even with the Muhammad Ali's, because of what he's done.
McKenzie concluded: "That's what I'm saying, he's in the top 20!"
https://talksport.com/boxing/3436880...-muhammad-ali/
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