No one can beat manny...Pacquiao is stronger than guzman, faster than valero, and better than juan manuel marquez.

Joan guzman is a good fighter, with a lot of skills. Compared to pacquiao however, his style would never work. He'll knock him down in the first round.
The pacman has already proven that he can defeat a technical boxer when he defeated Erik morales. Erik is a defense specialist and had a granite chin. But this could not help him against pacquiao. It's noteworthy to say that before being floored by pacquiao, morales never ever tasted the canvass. Against pacquiao, he had a mouthful...Guzman is almost the same style as morales-only younger, he has skills but no power. How can he last against manny?

Edwin Valero is a great fighter with lots of power. One thing I don't like about him though-is his defense. I've seen his videos in the net and he did not show much defense. Maybe because he didn't have the opportunity to do so or maybe he has none. No one he fought is recognized as a knockout artist, maybe that's why he could bully his way against them. If ever he gets the chance to fight pacquiao he'll surely need to do defense. With both of them hitting hard, the one who can evade punches is more likely to win.

Juan Manuel Marquez is beyond pacman's league. How can he defend his belt with his glass chin? He had to go to distance against Barrera in a fight where the judges could go either way. Pacquiao however showed the world how Barrera should be beaten - to a Pulp! Pacman and marquez's last fight left more question than answers. The scoring of the 1st round became an object of debate, after one of the judge gave marquez a 9 instead of an automatic 8 points (which is given when there is a ko in the round). Even assuming that judges should be given wide discretion in their decision, they should also know when to give credit when it is due...that judge surely brought the draw in that fight.