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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