Top three men all carry doubts into a wide-open US Open

Defending champion Carlos Alcaraz returns at the US Open on 30 August after four months out with right wrist tenosynovitis. World number one Jannik Sinner arrives with no hard-court match time after withdrawing from Cincinnati with a knee injury. Alexander Zverev, now ranked second, holds momentum after the French Open title and a Wimbledon final.