The case of the world No. 1 in men's tennis is at the center of anti-doping protocols and reforms that could redefine its parameters.

Although he had been acquitted in the first instance, Jannik Sinner understood that it was better to accept the agreement with WADA by avoiding arriving at the hearing before the CAS in Lausanne. The world number 1 has suffered a three-month suspension that will expire on May 4,

Jannik Sinner received a 3-month ban after testing positive for a banned substance, with the Italian initially refusing to accept he would face a suspension.

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.

Sinner asked: "Why would we do that if the first independent tribunal found it was no ban at all, why would I accept three months now?"