Novak Djokovic has said that he agrees and disagrees with parts of the legal action taken by the Professional Tennis Players’ Association (PTPA), the players’ union he co-founded.

Novak Djokovic doesn’t want the antitrust lawsuit filed by the players’ association he co-founded to create a rift in tennis, but he also said Thursday that the athletes’ share of revenues and their influence both need to increase.

To Bill Ackman and Novak Djokovic, that gap is a problem worthy of a US federal court lawsuit. The pair — one a hedge fund manager and the other a tennis champion — are friends, culture war contrarians and partners in the Professional Tennis Players Association,