Top-ranked Jannik Sinner added another big title to his tremendous year, beating U.S. Open runner-up Taylor Fritz 6-4, 6-4 on Sunday for the ATP Finals trophy before his home fans — and before a final verdict is reached in his doping case. Sinner won his first two Grand Slam titles at the Australian Open and U.S. Open in 2024 and had already clinched the year-end No. 1 ranking. 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.