(NewsNation) — NBA legend Michael Jordan has work to do to win an antitrust case against NASCAR, according to an attorney.

Jordan took the stand at the landmark case Friday and testified that he has been a fan of the stock car series since he was a child but felt he had little choice but to sue to force changes in a business model he sees shortchanging teams and drivers risking their lives to keep the sport going.

Criminal defense attorney Brian Claypool told NewsNation that the plaintiffs are “going to need to put on evidence” of a motorsport monopoly.

“For example, another venture came up and tried to start a similar kind of racing venture, and that was squashed by NASCAR.”

Jordan testified before a packed courtroom for an hour. His celebrity drew quips from the judge and even a defense attorney as he outlined why the team he co-owns, 23XI, had joined Front Row Motorsports in going to court against the top auto racing series in the United States.

“Someone had to step forward and challenge the entity,” Jordan told the jury.

“I sat in those meetings with longtime owners who were brow-beaten for so many years trying to make change. I was a new person, I wasn’t afraid. I felt I could challenge NASCAR as a whole. I felt as far as the sport, it needed to be looked at from a different view.”

Claypool believes there is a possibility NASCAR could be permanently altered should Jordan win the case.

“If the judge decides the antitrust remedies, he could tell NASCAR they have to sell their tracks. He could get rid of the system that they used to pay the teams and say they need to bring up a new system.”