The 23-year-old could be banned from tennis for up to two years if the Court of Arbitration for Sport (CAS) upholds the World Anti-Doping Agency (WADA) appeal into Sinner’s doping case. He tested positive for clostebol, a banned anabolic steroid on March 10 at the BNP Paribas Open held in Indian Wells, Calif, and on March 18, out of competition.