Prajnesh defeated Sock 6-7 (3), 6-2, 7-6(5) in the second-round contest which lasted almost three hours on Thursday evening.
Ranked 146 in the ATP rankings, Prajnesh will now lock horns with Brazilian qualifier Thomaz Bellucci for a spot in the semifinals of the hard-court tournament.
Another Indian participating in the event, Ramkumar Ramanathan, has already made an exit. In singles, Ramkumar lost 6-3, 4-6, 1-6 while in doubles, he along with Andre Goransson, lost 1-6, 4-6 to the duo of Hunter Reese and Sem Verbeek.
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