"Alexei Popyrin is getting closer and closer, knocking on the door": Novak Djokovic

Novak Djokovic returns to Laslo Djere on Day 3 of the US Open in New York on Wednesday. Pic/Getty Images

Defending champion Novak Djokovic racked up his 90th win at the US Open on Wednesday by defeating Serb compatriot Laslo Djere who retired in the third set of their second round clash. Djokovic, a four-time champion at the tournament and seeking a record 25th Grand Slam title, was leading 6-4, 6-4, 2-0 when Djere called it quits. The World No. 109, who pushed his countryman to five sets in New York last year, had required a medical time-out to treat an injury just before dropping the second set.

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The 37-year-old Djokovic had himself required a visit from the trainer for what appeared to be a side strain after sealing the first set. World No. 2 Djokovic is now the only man to have won 90 matches at all four Grand Slams. "It's not what we want to see when there's a retirement. Laslo had an injury which took him off the tour for some time and he's been struggling to come back," said Djokovic.

"He's such a good player in these conditions and the second set should have been his, he was 4-2 up. I don't know if [my' winning the second set probably put more burden on him." Djokovic will next meet Australia's Alexei Popyrin who he defeated at the Australian Open and Wimbledon this year with both matches going to four sets. Popyrin is in a rich vein of form having won the prestigious Montreal Masters on the eve of the US Open. "He's getting closer and closer and knocking on the door," said Djokovic of the world number 28 who has made the last 32 in New York for a third time. "We always knew he had the big serve but now he is more consistent, making fewer errors than he used to. He's pumped and playing some good tennis."

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