Karlovic hits 26 aces to beat Sock in Washington quarters

Ivo Karlovic hit 26 aces and saved all four break points he faced while beating sixth-seeded Jack Sock of the U.S. 7-6 (4), 7-6 (6) on Friday at the Citi Open to reach the hard-court tournament's semifinals for the first time since 2007

      

 

 

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