Novak Djokovic is 38 and bidding for a 25th Slam title. He faces Carlos Alcaraz at the US Open

Last season was his first without earning at least one since 2017. And Djokovic is clear that, at this point in his career, those big trophies from the sport’s four biggest events are all he really cares about. At this year’s three other major tournaments, he exited in the semifinals, two after get...