If Pacquiao-Marquez IV pushes through, and Pac fights the way he did Bradley, that's it. He was able to manage a win on the scorecard partly because of his aggression and workrate(and knockdowns). But looking at how he fought against Bradley, he was looking for openings and was only active half of the time. He can't do that against Marquez who will be looking to take it all away from him this time out. The best chance he got is to leave everything behind, focus 100% in boxing, and train without any nuances like press tours etc. Which will not happen. I'm thisclose to saying he will lose it. There's still a part of me that says he can still pull it off and I'm still hoping for a Mayweather clash on 2013.
its wierd how his stamina just dropped off within 1 or 2 fights... i seen a big difference in stamina with the marquez 3 fight and the bradley fight but history has shown us the former great fighter must be viciously beaten for the torch to be passed on (chavez v delahoya or tzyu), morales v zaragosa , ali v holmes hopefully manny just retires and moves onto becoming a full time politician before someone harmful enough bursts on the scene... at the moment i see a few that would beat pacquiao fairly easily but none that would viciously beat him down