Ah yes,that fight.Liston,while still a novice ( it was only his 8th professional fight ) showed immense heart while battling through to the bitter end,with a broken jaw.
Listons ranked opponents were generally not heavyweights by today's standards. He won the title from a guy the size of Bivol. Isn't his lack of heavyweight opponents at least as much a problem for him here as Ruiz is for Joshua?