Positive for doping last April. This is what happened to the Italian Jannik Sinner, but an independent investigation by Itia, the world tennis anti-doping agency, cleared him.
In fact, it would have been an "unconscious intake", due to a substance used by his physiotherapist, as communicated by the press office of the Italian tennis player.
The substance found in the world no. 1 tennis player was a metabolite of Clostebol , a steroid. Sinner does not incur any sanctions, and will be able to continue his season.
(Online Union)