**Alcaraz holds a clear edge in the 2026 Grand Slam title race at 70% implied probability, driven primarily by his Australian Open victory and favorable positioning for the US Open.** Alcaraz captured the 2026 Australian Open to complete the career Grand Slam, defeating Novak Djokovic in the final, while Sinner reached the semifinals before falling. Both players missed key events due to injuries: Alcaraz sat out the French Open and Wimbledon with a right wrist issue sustained in April, and Sinner suffered an early French Open upset before winning Wimbledon to defend his title. With the US Open (the final 2026 major) approaching, Sinner has withdrawn due to a right knee injury that also sidelined him from Montreal and Cincinnati, leaving Alcaraz as the defending champion and No. 2 seed with a potentially clearer path. Alcaraz leads the head-to-head 10-7 overall (including strong hard-court results) and enters the hard-court major after four-plus months away, though his prior recovery patterns and surface history support expectations of competitiveness. Sinner’s earlier-season form included multiple Masters 1000 titles and a Monte-Carlo win over Alcaraz, but his recent physical setbacks and absence from the year’s last Slam tilt the consensus toward Alcaraz finishing with more 2026 major titles. Market pricing reflects this injury-driven asymmetry and Alcaraz’s proven major pedigree rather than any guarantee of outcomes.