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01/25 04:11 CST Novak Djokovic advances to Australian Open quarterfinals on a walkover after Jakub Mensik withdraws Novak Djokovic advances to Australian Open quarterfinals on a walkover after Jakub Mensik withdraws MELBOURNE, Australia (AP) --- Novak Djokovic has had a walkover into the Australian Open quarterfinals after Jakub Mensik withdrew 24 hours ahead of their scheduled fourth-round match with an abdominal injury. The tournament confirmed Mensik's withdrawal late Sunday. The match had been scheduled for Rod Laver Arena on Monday night. "After last couple of matches, I started to feel worse, and actually the problem is my abdominal muscle on the left side," Mensik said in comments published by the tournament. "Like I said, last few matches it got significantly worse, and I think if I would step on the court tomorrow, it would be such a big risk for me for my next weeks, for my next tournaments, and actually for my health." No. 16-seeded Mensik beat Ethan Quinn in straight sets on Saturday. Novak Djokovic has won the Australian Open a record 10 times. The 24-time major winner became the first player to reach 400 wins in Grand Slam singles when he beat Botic van de Zandschulp 6-3, 6-4, 7-6 (4) on Saturday night in the third round of the Australian Open. ___ More AP tennis: https://apnews.com/hub/tennis

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