I don't see Primo stopping Ray but keeping him on the outside with his jab, Ray got lazy and as Jesse Ferguson showed us he could be out-hustled, might not be an upset
Mercer would be the one doing the jabbing not Primo. Primo gets pushed back, battered up and stopped. That is, if Mercer takes the fight seriously.
On paper I should be favouring Carnera, but I actualy think it very likley that Mercer coiuld outpoint him. Mercer is one of those fighters who was so close to being something realy special, but was missing one cog somwhere.
Assuming Mercer takes his bout with a time-traveling gigantic heavyweight champion from yesteryear more seriously than he took his tune-up against the Boogeyman (And why wouldn't he?) he should pound on Carnera.
Primo kos him with a tremendous uppercut in round seven, no one could slug with The Alp.71kos in 88 wins . He might break Mercer's jaw.
Are you serious? Mercer has one of the greatest jaws of the modern era. Not even a young Wlad could knock him out despite pounding on him non-stop the whole fight, and Ray was already way past his prime at that point. The man took the best that Cooper, Morrison, Holyfield and Lennox could throw at him without wilting yet Carnera knocks him out? Be realistic.
Mercer never felt the impact of the Alpine Atom on his jaw. A gigantic man with gigantic power. If Holyfield could drop Mercer, Carnera would decapitate him.
Carnera stopped a lot of fighters but they weren't often durable fighters - he just drowned them with his size. He didn't have the one punch snap to KO Mercer, imo.