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 says he was lost and confused after receiving a three-month doping ban from the World Anti-Doping Agency in February.

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.