There was this point in the second set between Rafael Nadal and Novak Djokovic, as much of a point as Arthur Ashe Stadium could ever see between two tennis players like this, 54 shots between them, the place finally exploding when Djokovic won a game that felt like some prize fight that had gone the distance. Like he had just won the championship of these few moments at the United States Open. It was 4-2 for him with the break of serve. And even though Nadal would break back, because that is what Nadal does — you can put him down for a point or a game or a set, but try doing it for a whole match — Djokovic was going to win this set and even the finals of the Open at one set all. Jimmy Connors was sitting behind the court, Connors who won the Open five times, won it on three different surfaces, owned the modern Open in Queens more than any player ever has, and now he said, “You think Novak wants to play 54-shot rallies all night?” Then Connors, who understands Nadal because he once played lefthanded hardball tennis as hard as Nadal does…