Legal battles loom for all four major parties involved in the May 2 mega-fight between Floyd Mayweather and Manny Pacquiao. Along with the two boxers, both HBO and Showtime, who joined forces to put on the pay-per-view at the MGM Grand in Las Vegas, are being sued just days after the bout.

Pacquiao and Top Rank Promotions find themselves on the receiving end of 13 total lawsuits for not revealing the boxer’s shoulder injury prior to the fight. One lawsuit from Illinois is going after Top Rank, Mayweather, Showtime, HBO, AT&T, Comcast and DirecTV.

At the post-fight press conference, it was revealed that Pacquiao was hampered by a shoulder injury, which he suffered less than three weeks before the fight. The 36-year-old underwent surgery on Wednesday to repair his torn rotator cuff, and he’s expected to be out of action for nine months to a year.

"Our state has a law that prohibits concealing or misrepresenting material information with consumers and, within the context of boxing, Manny Pacquiao's shoulder injury is a material fact," said Bob Duncan, one of the lawyers for the Illinois plaintiffs, according to ESPN. "Had our clients known that the underdog had a shoulder injury, they wouldn't have thought that this fight was worth watching."

Pacquiao asked for treatment just hours before the fight, but the Nevada Athletic Commission denied him a shot with the drugs Bupivacaine, Celestone and Lidocaine because he didn’t disclose the injury on the prefight medical questionnaire.  

All of the class-action lawsuits are seeking at least $5 million, and one is looking for compensation for fans who bought the PPV, ticket buyers and those who wagered on the fight. Pacquiao was a decided underdog in the fight, but a considerable amount of the action was placed on him.

The PPV was the most profitable of all time in part because it was the most costly PPV in history. Fans who purchased the fight in HD plunked down $99.95 for the right to watch the most highly anticipated bout in recent memory. Mayweather and Pacquiao reportedly split a total of $300 million, and Pacquiao’s agreement to take 40 percent of the purse will leave him with a payday in the nine figures.

A statement from Top Rank lawyer Daniel Petrocelli called the lawsuits “factually wrong and legally wrong.” Lawsuits were filed in eight different states.

Mayweather didn’t take part in covering up Pacquiao’s injury, but he’s dealing with his own set of legal issues. The undefeated boxer has been sued by the mother of three of his children, Josie Harris, for defamation.

The lawsuit stems from comments Mayweather recently made, regarding his 2010 arrest for domestic violence. In April, Mayweather denied many of the allegations against him in an interview with Katie Couric for Yahoo.

“Did I kick, stomp and beat someone? No, that didn’t happen,” Mayweather told Couric. “I look in your face and say, ‘No, that didn’t happen.’ Did I restrain a woman that was on drugs? Yes, I did. So if they say that’s domestic violence, then, you know what? I’m guilty. I’m guilty of restraining someone.”

The lawsuit says the idea that Harris was on drugs during the time of the incident that landed Mayweather in jail for three months is false. Mayweather allegedly punched Harris and threatened to kill her before he was arrested.

Harris is seeking $20 million in damages. Mayweather flashed a $100 million check at the May 2 post-fight press conference, though he could be paid twice that amount when all the PPV numbers are tabulated.