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

Jannik Sinner returns to action at the Italian Open after the conclusion of the World No 1’s three-month doping ban. Sinner has not played since winning the Australian Open in January for his third grand slam title after the Italian reached a resolution agreement with the World Anti-Doping Agency (WADA).

His appearance at the Italian Open marks the first tournament he's played at since winning the Australian Open for a second time in January. Sinner admitted during his media availability on Monday that it may take him some time to recognize where he's at competitively after his time away from tennis.