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.

In a long interview with 'BBC Sport', James Singer - one of Jannik's lawyers - revealed further details about the agreement between the world number 1 and WADA, which was made official when the Italian was already in Doha to participate in the prestigious ATP 500.

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.

The 23-year-old Italian will make his return to action at the Rome Masters 1000 in May, which will also serve him to test his condition ahead of Roland Garros. Having won the Australian Open at the beginning of the year, the ace from Sesto Pusteria can dream of completing the 'Calendar Grand Slam' already this year.

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.

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?"