Novak Djokovic's magic number? Five. That's how many wins he needs for calendar year Grand Slam.

almost 3 years in USA Today

The No. 1 men's tennis player defeats Tallon Griekspoor 6-2, 6-3, 6-2, says he has found his rhythm in his serve. That's bad news for Kei Nishikori.
      

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