When can paying sports fans sue over an event they now consider a fraud? That’s what a federal appeals panel weighed Thursday in a case that boxing fans brought over the 2015 match between Floyd Mayweather and Manny Pacquiao, then dubbed the “Fight of the Century.”

The oral arguments before the U.S. Court of Appeals for the Ninth Circuit intertwined the unpredictability of sports with how much paying fans needed to know about an athlete’s injuries. Plaintiffs’ lawyer Hart Robinovitch is attempting to reverse dismissal of dozens of class actions brought by fans who paid $89.95 to watch the match on HBO pay-per-view but were unaware that Pacquiao, the losing boxer, had a pre-existing torn rotator cuff before stepping into the ring at the MGM Grand Hotel in Las Vegas.