What there isn't a question about is will the fight sell. Bad Left Hook with more:
Bad blood and past controversy will have to sell this fight, combined with the fact that Marquez has been Pacquiao's equal over 24 rounds. And I think that can sell this fight. When you put that together with the fact that Pacquiao has a huge fanbase, and Marquez has a great built-in fanbase, you could be looking at a terrific pay-per-view performance. For all of its faults as a fight, the media push for Pacquiao vs Mosley proved to work, resulting in a reported 1.3 million buys, Pacquiao's biggest PPV sale to date.
There is a huge fanbase for both fighters. The rivalry between Pacquiao and some of the great Mexican fighters of this era can sell. And the fact that Marquez will not just show up to not get knocked out and collect a paycheck like Joshua Clottey can only help.
Marquez truly believes that he won the first two fights and will not shrink away from the fight. Pacquiao will be the favorite, and rightfully so. But even if he wins all 12 rounds, he's going to have to fight to earn them.