Serena Williams and Carlos Alcaraz saw their star-studded US Open mixed doubles run end in the quarterfinals, falling 5-4(4), 4-1 to Belinda Bencic and Flavio Cobolli. The loss ended Williams’ memorable return to Arthur Ashe Stadium but added another headline moment to the revamped event. Serena Williams Alcaraz exit in quarterfinals Wil