Two-time defending champion John Isner and last year's runner-up Lleyton Hewitt booked a semi-final showdown at the ATP Hall of Fame Tennis Championships on Friday.
Isner defeated Croatian Ivo Karlovic in a match in which the two towering players combined for 37 aces.
America’s Isner fired 23 of those en route to a 7-6, (7/3), 7-6 (7/3) victory on the grass courts at the International Tennis Hall of Fame.
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