Some top tennis players are suing the sport’s governing bodies for allegedly running a cartel that caps prize money, limits off-court earnings and restricts competition from rival tournaments.The Professional Tennis Players Association,

The lawsuit seeks a jury trial and wants players to gain access to more earnings, arguing that the governing bodies that oversee the four Grand Slam tournaments and other professional events “cap the prize money tournaments award and limit players’ ability to earn money off the court.

The tennis players’ association that was co-founded by Novak Djokovic has filed multiple lawsuits around the world against the sport’s tours and governing bodies.