A marquee matchup in an otherwise surprising Newport quarterfinal lineup pits Ivo Karlovic against Dustin Brown on Friday. Jack Sock and Jan Hernych are also looking for a spot in the last four.

Dustin Brown vs. (2) Ivo Karlovic

Karlovic and Brown will be squaring off for the fourth time in their careers and for the second time this season when they do battle in the quarterfinals of the Hall of Fame Tennis Championships on Friday. Brown is leading the head-to-head series 2-1 despite falling to the 6’11” Croat 6-3, 6-7(3), 6-2 five months ago on the hard courts of Delray Beach. A pair of 2014 encounters went Brown’s way; 3-6, 7-6(13), 6-4 in Doha and 7-6(4), 7-6(5) on the clay courts of Doha. Karlovic has broken serve five times in their three matches, while the German has earned two breaks. This will be their first meeting on grass, a…