Twelve months ago, the swashbuckling Spaniard, who will be playing in his 18th Grand Slam final, sat at home in Manacor, nursing his troublesome knees and fearing his career may be finished at just 26. But after seven months out of the sport, Nadal has been a revelation.
He has won nine titles, including a record eighth French Open, taking his Grand Slam haul to 12, stacked up a 59-3 victory run as well as a perfect stretch of 21 wins on hard courts.
“With no doubt he's the best player this year, no question,“ said Djokovic.
Nadal leads Australian Open champion Djokovic 21-15 in a career rivalry that began at Roland Garros in 2006.
Their 37th meeting will be a record on head-tohead meetings, beating the 36 duels that John McEnroe and Ivan Lendl fought in their careers.
Nadal has won five of the last six meetings, a stretch which started after Djokovic won their epic 2012 Australian Open final, played out over a gruelling five hours and 53 minutes.
One of Nadal's wins was in a pulsating French Open semi-final in June where Djokovic led 4-2 in the final set before Nadal hit back to keep the Serb still waiting for a maiden title in Paris.
Both men will be chasing their second title in New York -Djokokic was champion in 2011, beating the Spaniard the year after Nadal completed his career Grand Slam in the city by seeing off the Serb.
Despite his mastery over the Serb, Nadal admitted he would have been happier to see someone else on the other side of the net today. “I prefer to play against another one, but it is what it is,“ said Nadal. “I want to play against a player where I have more chances to win. But I played against him a lot of times. Always we played very exciting matches.
“When you are involved in these kind of matches, you feel special. Even if I lost that final in Australia, I feel happy to be involved in that match.“
Djokovic is playing in a fourth successive US Open final, fifth in total and 12th major championship of his career.
He made the final by edging Stanislas Wawrinka in a five-set semifinal in what was his 14th consecutive run to the last four at a Grand Slam.
It is also his third major final of the season after seeing off Andy Murray, who was the defending champion in New York, in Australia before being overwhelmed by the Briton at Wimbledon.
Djokovic is already guaranteed to retain the world number one spot whatever happens today.
He will enter the final having to quell his irritation at having to play today when he has a Davis Cup semi-final to play against Canada starting on Friday.