Jannik Sinner opened up about his ongoing doping case after beating U.S. Open runner-up Taylor Fritz 6-4, 6-4 on Sunday for the ATP Finals trophy before his home fans.

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. A final ruling is expected from the Court of Arbitration for Sport early next year.