Jannik Sinner enters the 2026 US Open as the clear frontrunner on the men's side after dominating recent hard-court events, while defending champion Carlos Alcaraz faces fitness questions following his wrist injury and withdrawal from Cincinnati. Aryna Sabalenka leads women's title odds on the strength of consistent Grand Slam results and hard-court form. Key factors shaping finals matchups include official injury reports for top seeds, recent match results on outdoor hard courts, head-to-head records in major tournaments, and potential late withdrawals or schedule management. With the main draw opening August 30 and finals set for September 12-13, traders monitor player fitness updates and qualifying results that could alter bracket paths for contenders like Elena Rybakina, Alexander Zverev, and Coco Gauff.