Rocky would be too strong for Roy, in my opinion. A Marciano win by knockout in the first round would not surprise me.
Yes, the photographs I've seen do make me wonder if stories about Marciano having been in danger of a stoppage in the Simmons fight are exaggerated or not. Either way, as a note to Mcvey, I said "major" fights- surely a road battle against an obscure journeyman (at a time when Marciano's left eye likely had still-tender scar tissue after it had been deeply gouged by a headbutt from Johnny Shkor in a recent match) does not qualify. From the time Marciano stepped up to the elite level through his retirement, his entire championship-tier career, the only time he ran any clear risk of being stopped was the second Charles fight, which was an absolute aberration and does not really illustrate any generalized weakness on Marciano's part. You are correct that Marciano did bleed frequently in his major fights, but it never reached the extent at which he was in any serious danger of a stoppage aside from the nose-cartilege-tearing incident, which was a freak of nature and was likely the result of a foul.
Your opinion does not concur with either the referee Sharkey Buannano ,who said he "could have stopped it anytime after the second round",Allie Columbo's,or Charlie Goldman's,and as they were somewhat nearer to the action than you would be viewing it from a photograph I will go with their recollections.
Sorry I did not see the "major fight " bit.The split nose was the result of an elbow I think.Hey I picked Rocky to win this matchup ,put your hands down
Rocky Marciano vs Roy Jones Jr. It would be a good fight for 6 rounds as Jones is the quicker of the two fighters, the problem that I envision is that Roy would be coming up in weight, from light heavyweight. He is used to using his speed and power against 175 lb fighters. Marciano is used to taking blows from much heavier fighters. I see from round 6, after eating a succession of jabs and sharp punches. Rocky's pressure starts to take effect on Jones, especially hard body punching.Marciano lacerated around the eyes, forces Jones into cover up mode, he begins to hold more. Jones does not answer the bell for round 10.
Plenty of guys far, far faster, with far better footwork tried to touch Roy in the first round and weren't able to achieve the task you mention.
Prob. the finest poster in this "alternative" place among comic hero worshippers. But isn´t he Tonto62, who posted some stuff lately?