But that one, tiny outcome didn't matter. Never seems to with Djokovic, especially in best-of-five-set matches on his sport's most prestigious stages. As usual, he used his superb returning and never-take-a-rest defence to wear down Zverev. So, yes, Djokovic lost that point — which was preceded by others lasting 13, 19, 22 and 31 shots, and followed by one that went 16 — but he won that game, and that set with it.
Just as he had lost the first set about 1 1/2 hours earlier but turned things around, with the help of a dip in level from the fourth-seeded Zverev. And just as, later, Djokovic lost the fourth set but immediately rebounded and was nearly untouchable while going ahead 5-0 in the fifth then held on.
Djokovic, who has spent more weeks at No 1 in the ATP rankings than anyone, figures out what is required to emerge on top and does it. In each of his past four matches — and 10 in all at the Slams this year — he trailed by a set and won.
He equalled Federer by getting to a 31st career Slam final; Djokovic's total now includes a record nine in New York, where he has won three championships. It will be Slam final No 3 for Medvedev, a 25-year-old from Russia, who eliminated 12th-seeded Felix Auger-Aliassime of Canada 6-4, 7-5, 6-2.
Medvedev was defeated by Djokovic in this year's Australian Open final and by Nadal in the 2019 US Open final.
"The more you lose something, the more you want to win it. The more you want to gain it and take it," said Medvedev, who has lost only one set over the past two weeks. "I lost two finals. I want to win the third one."
Djokovic is trying to go four for four at the majors over the course of one season, something last done in men's tennis by Rod Laver 52 years ago. It was also done by Laver in 1962 and Don Budge in 1938. Three women have completed what's known as a true Grand Slam, most recently Steffi Graf in 1988.
"It's great for the sport," Zverev said about Djokovic's pursuit. "Nobody thought that anybody would do it again. I do believe that he will do it."
- AP