The boys section saw two more upsets with Sahil Gaware of Maharashtra and Tamil Nadu's Vasudev Vijayaraman recording contrasting wins, while Zeel Desai took the upset count of the day to four in the girls section of the meet organised and hosted by Deccan Gymkhana.
The day, however, belonged to Gupta who battled for an hour and a half to put out Delhi lad Prasad 7-6 (5) 6-3.
Later, Gaware, a left-handed player, put out No. 4 Udayan Bhakar of Rajasthan 6-3 6-4 and joined state mates, No. 6 Indra Patwardhan and unseeded Aryan Goveas, in the last 8.
Vasudev won a long-drawn battle against eighth seed P VGnana Bhaskar of Andhra Pradesh 3-6 6-2 6-2. Vasudev's two- hour tussle ensured that the quarterfinal round will have just four seeded players in fray.
In girls section, Gujarat's Zeel Desai put an end to eighth-seeded R Abhinikka of Tamil Nadu 6-1 6-1.
Results: Boys (Pre-Quarterfinals) Shrey Gupta (Har) bt 1-Vishnu Prasad (Dli) 7-6 (5) 6-3; 7-Dalwindar Singh (Pun) bt Yash Yadav (MP) 6-2 7-6 (4); Sahil Gaware (Mah) bt 4-Udayan Bhakar (Raj) 6-3 6-4; 6-Indra Patwardhan (Mah) bt Dheer Bhatti (Chd) 6-3 7-6 (2); Vasudev Vijayaraman (TN) bt 8-P V Gnana Bhaskar (AP) 3-6 6-2 6-2; Aryan Goveas (Mah) bt Jagesh Pungliya (Mah) 6-2 6-3; 5-S D Prajwal Dev (Ktk) bt Paramveer Bajwa (Chd) 6-2 6-2; 2-B R Nikshep (Ktk) bt Ganesh Srinivasan (TN) 6-2 6-3.
Girls (Pre-Quarterfinals): 1-Vanshika Sawhney (Dli) bt Q-Amreen Naaz (AP) 6-1 6-2; 7-Mihika Yadav (Mah) bt Pragati Natraj (Ktk) 4-6 6-3 6-4; 3-Devanshi Bhimjiyani (Mah) bt Snehal Mane (Mah) 6-1 6-0; 5-Shruta Gunuganti (AP) bt A Shameema (TN) 6-0 7-6 (3); 6-Vasanthi Shinde (Mah) bt Kanishka Chawla (Mah) 6-1 6-0; 4-Rashmitha Reddy (AP) bt Aastha Dargude (Mah) 7-6 (4) 6-0; Zeel Desai (Guj) bt 8-R Abhinikka (TN) 6-1 6-1; 2-Akshara Iska (AP) bt Nandini Sharma (PB) 6-3 7-5.