Darryl Pinckney --- once in the 7th round Freddie Norwood -- once in the 2nd round Manny Pacquiao --- four times 1st round, 3rd round in Fights 1 and 2 respectively Marco Antonio Barrera - once This record only shows that Marquez's chin is suspect. He was knocked down 7 times. I predict he will go down in 3 rounds in the Mayweather fight.
Ruin? I don't think so. Norwood despite the headbutt won by UD. I don't think he was ruined by Marquez. Pac beat him twice. No way, Pac was ruined. Barrera was perceived to have won that fight.
Okay, if we count his holding on the rope to avoid a fall, it's 8 times. Floyd will finish him within 3 rounds. Floyd will be too much for him.
JMM goes down quite a bit but he seems to recover well. But even if Marquez had been down 0 times he would be out of his depth against the veritable giant that will be Mayweather. It's a pure mismatch, regardless of JMM's chin.
Your avatar has been knocked out a couple of times so what. Marquez has never been Knock Out and even if his chin is not granite this is not so important. You can not change your chin but your hearth and desire to win deppend all on you. And Marquez has shown that he has these qualities with tons. And why do you make this thread to disrespect Marquez his achievments are pushing your guy even higher in the ATG list. And a third fight between them could be an all time classic