NEWPORT, R.I. — Two-time defending champion John Isner won the battle of the tallest players on the ATP tour, defeating Ivo Karlovic of Croatia, 7-6 (7-3), 7-6 (7-3), on Friday to advance to the semifinals of the Hall of Fame Championships.
In the other quarterfinal match, No. 4 seed Lleyton Hewitt of Australia beat qualifier Jan Hernych of the Czech Republic, 6-7 (3-7), 6-4, 6-2, setting up a rematch up of last year final when Isner captured the title in straight sets.
On Friday, Isner won his 13th straight match on Newport’s grass courts and raised his mark to 13-0 in tiebreakers during the streak.
The second-seeded Isner, who stands 6-foot, 9-inches, served 23 aces, including three in each of the tiebreaks. Full story for BostonGlobe.com subscribers.