i doubt there's anyone who can knock him out. kovalev couldn't even knock him out at this very advanced age so i doubt anyone would be able to achieve that. but are there any middleweights/lightheavyweights who would have absolutely taken a prime hopkins to school besides maybe roy jones jr. i got maybe ezzard charles, and archie moore but hopkins is a very technically sound fighter with ATG defense and ring iq.
I was going to say Ezzard Charles and Moore as well. I'd give Billy Conn and Ray Robinson chances too, I could see Robinson starting with boxing and turning the pressure up later though.
Roy Jones didn't school a prime Hopkins. Ezzard Charles maybe but definitley not Archie Moore to outbox. I would have to say nobody to be honest Hopkins is just too good.