NEW YORK — The U.S. Open mixed doubles championship begins on August 24, 2026, bringing some of tennis’s biggest names together for a short, high profile event before the main singles tournament. The mixed doubles field includes major stars such as Serena Williams and Carlos Alcaraz, as well as Aryna Sabalenka and Novak Djokovic. The event runs from August 24 to August 26 at the USTA Billie Jean King National Tennis Center in New York. The format…