Novak Djokovic, a long-time advocate for players' rights, weighed in on the move from the organization he co-founded with other players. While the Serbian legend acknowledged the lawsuit’s intent, he also expressed some reservations about the letter.

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.