(FILES) Italy's Jannik Sinner plays a shot to Spain's Carlos Alcaraz during the men's singles final tennis match on day fifteen of the US Open tennis tournament at the USTA Billie Jean King National Tennis Center in New York City on September 7, 2025. World number one Jannik Sinner confirmed on August 21, 2026 he will not compete in the US Open because of a right knee injury. (Photo by CHARLY TRIBALLEAU / AFP via Getty Images)