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Fittingly, there is no world title belt or any sort of official accolades on the line in this showdown. There doesn't need to be, because the legacies of both Marquez and Pacquiao and their respective trainers, Nacho Beristain and Freddie Roach, will also be shaped around their recent track record.
No one doubts the legacies of Beristain and Roach, as both have been inducted into the World Boxing Hall of Fame already. But each have a chance to add a feather in their caps.
Each have had a perceptive drop-off in recent years. Roach won't want his man, Pacquiao, to lose his second consecutive fight—and first to Marquez—while Beristain will not want to be considered one of the better trainers of all time and not have one victory in four shots at Pacquiao on his resume.
Both fighters clearly have the power of self-belief, and both feel like they have a chip on their shoulder to definitively prove who is the better boxer this time around.
But a loss for Pacquiao would signify the likely downfall of his career, and the criticism surrounding his recent religious transformation he underwent combined with his other ventures into politics would be magnified.
Roach himself accused Marquez of using performance-enhancing drugs before backtracking (h/t FightHype.com).
Nevertheless, that is quite an indictment. Combine that with the three previous disappointments, and the 39-year-old fighter has plenty to fuel him—but plenty to lose in the public eye if he can't produce a convincing enough result in the ring for the judges to finally give him a favorable decision.