Cary: Fighting hard, Prajnesh Gunneswaran prevailed over tough nut Jack Sock in three sets to sail into the quarterfinals of the Atlantic Tire Championships, an ATP Challenger event, here.
The fourth-seeded southpaw beat the former top-10 American 6-7 (3) 6-2 7-6(5) in a tight round two contest, which lasted almost three hours.
The gritty Indian broke the serve of Sock, who reached a career-high singles ranking of eight in 2017 but is now placed 253, thrice and dropped his own serve only once in the slugfest.
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