Jannik Sinner's doping case has divided the tennis world for months, with the news he will serve a three-month ban leading to further questions and criticism.

Jannik Sinner’s deal with the World Anti-Doping Agency to accept a three-month ban for positive doping tests has been criticized by Australian player Nick Kyrgios, with the Professional Tennis Players Association citing a “lack of transparency" in the system.

The men's world No. 1 will miss several tournaments, but no Grand Slams. Here's what to know about the doping proceedings against him.