Isner v Karlovic head-to-head before Memphis?

Question

John Isner and Ivo Karlovic face one another in the quarter-finals in Memphis. But what is their head-to-head record leading into the match?

Answer 1

Karlovic leads 1-0 in their head-to-heads, with that match being played in New Haven in 2008. A total of 30 aces were served in the match, 17 of them by Karlovic and 13 by Isner.