Reaching a second consecutive Grand Slam final suggests the 13-times major champion is almost back to his best, though he will need to be even more clinical against Del Potro, who has only dropped one set in six matches in NY.
Del Potro is telling a slightly different story about his backhand this year.
Rafael Nadal was forced to retire after the second set.
That Del Potro lives for the big stage and champion clashes is evident. "I didn't expect to get [to] another grand slam final". "Would be a big challenge, as well, because I've been fighting with many, many problems to get in this moment". But Nadal was so distraught after he pulled out of the match that he had difficulty saying he was pleased to see del Potro advance. And in the finals, anything can happen.
I'm having two great years.
"All my career everybody said that because of my style, I will have a short career", he noted.
Del Potro may be the higher seeded player at No 3, but Djokovic, the No 6 seed, is the favourite to be the victor in NY. Nadal bested the Argentine in their meeting a year ago. Yeah, I mean, I think I have two finals won and five losses.More news: Tesla shares fall after Elon Musk smokes weed, drinks whisky during interview
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Unfortunately for Nishikori, Djokovic has been the victor in all 13 meetings since that match and has generally dominated this rivalry, so the Japanese player knows he is up against it here.
And Del Potro, who'll turn 30 on September 23, is relishing every minute of it as the memory of his "worst moment" recedes. Then I think it was a little bit better. "Reaching finals, winning titles, having my highest ranking ever - everything is nearly ideal". That second US Open trophy may not be delivered to del Potro's home this year. "Novak has won Wimbledon already".
Widely considered the best returner in the game, he kept accumulating chances - and then failing to cash them in. "He will be the favourite to win on Sunday", he said. I know what I have. He's bamboozled Federer two of the past four times they've played - in the quarterfinals here a year ago and in the final of the Indian Wells Masters 1000 in March.
After winning Wimbledon, Djokovic has shown he is indisputably back to his best following elbow surgery and revelled in the cooler conditions in a dominant semi-final victory over Kei Nishikori.
Djokovic said: "I personally like him very much, not just as a player but as a person". I missed lot of opportunities. We all felt for his struggles with injuries. "But he was always a top-five player in the eyes of everyone, even when he dropped his ranking". "It was just a matter of time", Djokovic said Friday. Djokovic shut himself down for the last half of 2017, sitting out the U.S. Open among other events and, after a brief attempt to play at the start of this season, had an operation in February.