I am a huge Floyd fan, and so should be biased, however i just cant see it happening. Manny has a very good chin, and Floyd has good power (when he chooses to use it), but not KO power. He just not the kind of fighter to even bother looking for a KO when he is up against a tough fighter. At the most i could see a TKO, or maybe Roach Throws in towell, but i only see one outcome..... Floyd by UD.
Mayweather isn't as powerful back in his feathers days. Manny has a solid chin! No doubt about it that mayweather has the tools to defeat manny but knock out or even a knock down? Anything is possible, but realistically speaking!
Pacquiao is not superman. He's been hurt before and he's been stopped before. Mayweather is a sharp, accurate puncher. So yes, Mayweather could definitely stop Pacquiao. He could TKO or KO him. However, in all likelihood, if they ever fought, it would go 12 rounds.
Even though I'm pretty sure Floyd will win against Manny, I don't think it to be probable that he will knock Manny down. But I can imagine a hit and run tactic. And him winning a shut out easier than we think possible.
I think that alot of people will be shocked at how easy Floyd handles Pac. Its something that is felt in the Pac camp which is the reason that the fight hasnt happened yet. I recall an interveiw with Freddy Roach about who would be Pac's toughest fight some few years back and he said "without a doubt Mayweather" The interveiw was on FNF which is shocking that it seems to have been lost and you cant find it anywhere. Roach said that its a hard fight for Pac because Floyd would stay out of range and make Manny reach and look to counter. And as soon as Manny started to get confused he would walk to him with a high guard and look to go to Pacs body. Roach said that its a bad style matchup, but he thought that Manny could win, but he needed some work. It was a few months later that the first fight was offered and turned down on the whole drug testing thing. So to answer the question, can floyd KO Manny? Not only can he, but he will. I dont know that he will knock him out cold but Manny wont finish the fight.
Post Plaster Margarito had Manny on edge with a hard body shot and Mayweather is a great body puncher against a lefty...use the Judah fight for reference
Knockouts don't usually come from one huge power shot, but rather the breaking down of a fighter with several shots over a lengthy period. Floyd Mayweather can and probably will do this in a Pacquiao fight.