Digvijay won 6-7(3), 6-2, 6-2 in a hard-fought match that lasted over three hours.
The first set went with the serve and in the tie-breaker, Parikshit edged past Digvijay only to see the Chandigarh boy come back strongly in the next two sets.
In the boys under-16 category, top seed B R Nikshep also had to battle hard to make his way in the last eight stage with a 7-6 (5), 6-2 win over Delhi boy Kushaan Nath who did not give easy points to his top seed opponent.
Also making it to the quarter-finals were fourth seed Aryan Goveas, who notched up a 6-4, 6-2 win over Dhruv Pal, Udayan Bhakar who defeated Nitin Kumar Sinha 7-5, 6-2 and third seed Paramveer Singh Bajwa who accounted for Anurag Nenwani 6-3, 6-3.
Parikshit Somani, who is unseeded in the boys' under-16, entered the quarterfinal by defeating Gokul Suresh 6-4, 6-7(5), 6-4.
In the boys under-14, top seed Sumit Pal Singh also marched into the last eight stage with a 6-2, 6-1 win over Saurav Kalkal, while third seed Nitin Kumar Sinha shut the door on Himanshu Mor 6-1, 6-2.
In the girls under 14, top seed Zeel Desai beat Sarah Dev 61,62 to sail into the quarterfinals.
