The tennis players' association co-founded by Novak Djokovic has sued the main groups that run the sport in a bid to gain more money and control.

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.

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.