Novak Djokovic admitted that he was concerned about his physical difficulties after he had traveled to the opening round in the opening round of the US Open.
While a 6-1 7-6 (3) 6-2 Scoreline routine may appear, Djokovic looked anything but comfortable in the final phases of a second set, which lasted 82 minutes.
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The 38-year-old, his black shirt, which was sweaty for him, saved a setpoint and a number of strenuous rally in the tie fracture gave him a snatch.
At the end of the set, Djokovic also took a medical break for the treatment of bubbles on the foot, but ultimately used his experience to create a collision with another American, Zachary Svajda.
“I started great,” said the seventh seed. “A little more than 20 minutes, at first I felt really good. Then a few long games to start the second set, and then I started to feel really (bad) – I don’t know why. I was really surprised at how bad I felt physically in the second.
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“We had long exchange, but I also dropped my level and made a lot of casual mistakes and brought it back into play. I am glad that I was somehow resisting after the second sentence. And the third sentence was fine to end the match.
“Well, now two days off. But it’s a bit of a problem. I have no injury or something. I only have a lot of problems staying in long stock exchanges and recovering on points.”
Djokovic played his first game since he lost to Jannik Sünder in the Wimbledon semi -finals, and initially looked sharp for almost 20 years against an opponent.
Tien announced his talent at the Australian Open in January with a run into the fourth round and in the second set he began to reach Djokovic from the baseline.
Novak Djokovic looked late in the second set in difficulties (Frank Franklin II/AP)
Rory McIlroy was one of those who enjoyed the strenuous exchange and Tien now won his fair proportion, with Djokovic had to come from 0-40 down to 2: 3.
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Tien, who works with the former French Open Champion Michael Chang, forced a setpoint of 5: 4 only for Djokovic to save it with a Spinpoint-Ace, but the Serbian would have been in real difficulties if everyone had gone to a sentence.
But he ended the tie break strongly and then recovered from an early break to dominate the third set. He was the first player in the open era to win 75 games in a row in the opening round of Grand Slams.