Sinner tested positive in two separate drug tests in March and a decision to clear him of wrongdoing was appealed by the World Anti-Doping Agency in September. Sinner’s explanation was that the banned performance-enhancer entered his system unintentionally through a massage from his physiotherapist, who had used a spray containing the steroid to treat his own cut finger. “I've kept on thinking about where we went wrong and what we could have done better,” Sinner said in Italian.