Why the lawsuit filed Tuesday exists, what it accuses tennis' governing bodies of doing and the next steps you can expect to see.

Australian tennis player Nick Kyrgios said the lawsuit filed by the Professional Tennis Players' Association (PTPA) against the sport's governing bodies marks a "special moment" and that it was high time the players' voices were heard.

The Professional Tennis Players Association sued the ATP, WTA, ITF and ITIA, citing anticompetitive practices.