Two boxing fans have filed a class-action lawsuit against Manny Pacquiao, his manager and his promoters for allegedly concealing a shoulder injury prior to his record-breaking fight against Floyd Mayweather.

The suit was filed Tuesday in federal court in Las Vegas and alleges that the two men were defrauded after paying to watch the fight, which Mayweather won by unanimous decision. It seeks damages for anyone who bought tickets, ordered the pay-per-view or even bet on the bout.

Nevada state athletic officials are also deciding whether to discipline Pacquiao themselves over the allegedly undisclosed pre-existing shoulder injury.

Judge Andrew Napolitano said on "Shepard Smith Reporting" that he read the questionnaire that Pacquiao signed just two days before the fight, in which he said under oath that he was fine.

Judge Napolitano revealed that there could be a serious investigation by the attorney general of Nevada into whether Pacquiao committed perjury to prevent the fight from being delayed.

As for the class-action lawsuit filed by the boxing fans, Judge Napolitano explained that since the lawsuit is on behalf of everybody who bought a ticket, ordered the pay-per-view or bet on the fight, it would require a tremendous amount of reverse engineering to undo every bet and financial transaction related to the event.

"This would have a profound effect on gaming in Las Vegas, where professional sports betting is lawful," Judge Napolitano said.

"On the other hand, it does appear that he was injured ahead of time, that he did not answer this truthfully and that the public was not aware of the injury."

Judge Napolitano noted, however, that the fact that the plaintiffs are only asking for $5 million suggests that they don't have a very strong case.

Get more insight from Judge Napolitano in the "Shepard Smith Reporting" clip above.

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