Novak Djokovic of Serbia returns the ball to Alexandr Dolgopolov of Ukraine during the fourth round match of men#39;s singles at the US Open tennis championships in New York, the United States, Sept. 6, 2011. Djokovic won 3-0. Top seed Novak Djokovic saved four set points in a marathon first-set tiebreaker to beat Alexandr Dolgopolov of Ukraine 7-6 (14), 6-4, 6-2 to reach the US Open quarterfinals on Monday. The world No.1 won the tiebreaker 16-14 on his sixth set point, which functioned well
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Novak Djokovic wins Alexandr Dolgopolov
