Alexander Zverev holds a near-lock on the 2026 ATP year-end No. 1 ranking after Jannik Sinner ended his season early due to a knee injury sustained around Wimbledon. Sinner currently leads the rolling 52-week ATP standings with 11,000 points but faces a steep drop from defended results, projecting him near 7,950 points by year’s end. Zverev sits at 9,720 points with far fewer points to defend, a floor above 9,000 even in a worst-case finish, and has already secured major titles at the French Open and US Open plus consistent deep runs. Carlos Alcaraz, third at 5,560 points, cannot mathematically overtake him regardless of results in Shanghai, Paris, or Turin. The market’s heavy weighting toward Zverev reflects this points math and the limited remaining schedule. Only an unforeseen withdrawal or major injury to Zverev could reopen the outcome before the ATP Finals conclude.