He had grown frustrated by the pro-del Potro crowd that sang and chanted his name throughout the three-hour, 16-minute match as if it were a soccer game.
Novak Djokovic won his 14th Grand Slam title and second in a row by getting through a key 20-minute game to beat 2009 champion Juan Martin del Potro 6-3, 7-6 (4), 6-3 in the U.S. Open final.
It was a magnificent night of tennis from both players, where Djokovic's athleticism, court coverage and tennis brains came out triumphant against Del Potro's big serve and forehand.
On the other hand, Argentine Juan Martin del Potro reached the final after defending champ and World No 1 Rafael Nadal retired due to knee injury.
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However, the despair on Sunday belonged to a teary del Potro, who was back in a grand slam final for the first time since his one and only title in NY in 2009. 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.
Djokovic was soon 3-1 up in the second set before Del Potro carved out his first break point of the match to level at 3-3.
The pair, who are great friends on the ATP Tour, shared other special moments together after the match with Del Potro having made his first Grand Slam final since winning in NY back in 2009.
Those produce free points against so many foes. Not against Djokovic, who always seemed to have all the answers.
It was Djokovic's 15th win over the Del Potro and fifth in five at the Slams.
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"I was playing nearly at my limit all the time, looking for winners with my forehands, backhands, and I couldn't make them because Novak was there every time", Del Potro said.
When another forehand error cost Del Potro his serve early in the second, all the momentum was with Djokovic.
Djokovic went on to congratulate Del Potro for his achievements despite all the injury trouble and made a massively sporting gesture by saying he knew Del Potro will stand as champion at this podium one day.
Djokovic then got right back to work, and announced that he was, once more, himself by winning Wimbledon.
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"Difficult times but you learn from adversity. when you have doubtful moments when things are not working out as you want (them) to and I try to take the best out of myself in those moments and thrive on the love and support I receive from my closed ones and get myself in this position", Djokovic expressed.