Jannik Sinner leads the 2026 US Open winner market at 40% implied probability due to his proven hard-court dominance, including multiple prior titles on the surface and consistent deep runs in recent majors, though his May French Open second-round exit from cramping and illness introduces some uncertainty ahead of the hard-court swing. Carlos Alcaraz sits second at 25% on the strength of his all-surface versatility and repeated Grand Slam final appearances against Sinner, positioning the pair as the clear frontrunners in trader consensus. Novak Djokovic at 5.5% reflects his enduring big-match experience and recent semifinal showings, tempered by age-related challenges in five-set battles against the top two. Lower-priced contenders like Alexander Zverev, Daniil Medvedev, and Ben Shelton trail further due to inconsistent recent form, prior injury setbacks, and the established gap to the Sincaraz duopoly on outdoor hard courts.