PARIS : World number one Jannik Sinner's doping hearing will start on April 16, the Court of Arbitration for Sport (CAS) said on Friday. Italian Sinner failed two drug tests in March for low levels of the anabolic androgenic steroid clostebol but was cleared by an independent tribunal in August after it accepted his explanation of unintentional contamination. However, the World Anti-Doping Agency appealed that decision at CAS in September, leaving the Italian still facing the possibility of