Pacquiao vs. Marquez 4: Breaking Down Pac-Man's Biggest Weaknesses

Manny Pacquiao is the overwhelming favorite (per Vegas Insider) to win the fourth installment of his epic series against Juan Manuel Marquez on Saturday. However, that doesn't mean Pac-Man is an impenetrable force without exploitable weaknesses. By now, Marquez knows Pacquiao better than any other fighter on the planet. The men already have a trilogy of bouts in the books, all of which have been down-to-the-wire slugfests that went down to judges' scorecards.  On Saturday, Dinamita shou...