With all the singing and noise levels inside the stadium, it felt to Djokovic like he was at a football match but he thanked the fans of both sides for creating such an fantastic atmosphere.
He closed his win with a yelp, barely audible over del Potro's ebullient fans. And it all started with Djokovic getting erked by crowd reaction and constant singing for Del Potro. "Ole Ole Ole. Delpo, Delpo" reverberated around the stadium in support of Del Potro.
Del Potro's forehand is among the most intimidating weapons in the sport, but it misfired under relentless pressure towards the end of the first set, Djokovic breaking in the eighth game - at the end of a 22-shot rally - and taking the opener.
Djokovic faced similar questions about whether he'd ever get back to another major final with his elbow woes, but after his triumph at Wimbledon in July, and with the more heralded - and older - Rafael Nadal and Roger Federer showing signs of slowing down, another reign of the Djoker looks very real in men's tennis. They went back and forth, through eight deuces and all those break opportunities for del Potro, until he slapped one forehand into the net, and another sailed wide.
Del Potro was looking at having to become the first man since Pancho Gonzales in 1949 to win the U.S. title from two sets down.
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After winning the first set 6-3, Djokovic was leading 3-2 in the second set (having broken Del Potro) and was serving to extend his lead to 4-2.
Djokovic and del Potro embrace.
In their first meeting in a Grand Slam final it was Del Potro, back at this stage for the first time since 2009, who won the coin toss and elected to receive under the Arthur Ashe Stadium roof with heavy rain falling in NY. It's also Novak's first US Open final after he missed last year's due to elbow injury and now he is back to his best.
"To support of my loved ones, my kids, my wife, my team of people that has been there with me through hard times as well".
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"You learn from adversity. when you have doubtful moments when things are not working out as you want (them) to".
"There was always part of me that believed I could come back relatively quickly to the level of tennis that I once was playing", Djokovic, 31, said before Sunday's match.
"When I had my surgery I could truly understand what Juan Martin was going through when he had surgeries that kept him away from the tour for two or three years", added Djokovic.
This was Djokovic's third championship in NY, along with those in 2011 and 2015.
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