Banthia had to work hard in getting the better of Danish Ahmad 6-2 7-5 but Nitin had an easy outing as he demolished Himanshu Mor 6-0 6-0 in the third matches.
Parikshit Somani also advanced with a 6-1 6-2 win over Mrityunjai Badola.
In Girls under-16 third round, top seed Sathwika Sama thrashed Avanthika Sai 6-2 6-2 while second seed Shivani Ingle toyed with Aesha Patel for a 6-2 6-1 win.
In the Boys' Under-14 event, there was more agony for top seed Himanshu Mor as he lost in straight sets to rank outsider Shashikant Rajput (4-6, 3-6). However, second seed Sacchitt Sharrma had to rally to beat Uddayvir Singh 2-6 6-3 6-3 as both players tested each other in baseline rallies.
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Girls' Under-14 top seed Prinkle Singh eased into the quarter-finals as she had an easy game against Kiran Kal Kal for a 6-2 6-0 win. Second seed Shreya Gulia was also in the comfort zone as she thumped Rutuparna Choudhury 6-1 6-2.
Boys Under 16
Parikshit Somani (Seed 1) bt Mrityunjai Badola 6-1, 6-2; Sumit Pal Singh bt Sivadeep Kosarju 6-2, 6-1; Siddhanth J Banthia (Seed 3) bt Danish Ahmad 6-2, 7-5; Dhakshineshwar Suresh bt Calvin Gomei 6-0, 6-4; Muthu Aadhitiya Senthilkumar bt Gurjot Sidhu 6-4, 7-6(3); Nitin Kumar Sinha (Seed 4) bt Himanshu Mor 6-0, 6-0; Yugal Bansal bt Aditya Vashisht 3-6, 7-5, 7-5 Adil kalyanpur (Seed 2) bt Abhimanyu Vannemreddy 7-5, 6-1
Girls Under 16
Sathwika Sama (Seed 1) bt Avanthika Sai 6-2,6-2; Shivani Ingle (Seed 2) bt Aesha Patel 6-2,6-1; Mahak Jain (Seed 3) bt Manjana Shivani 6-0,6-4; Vaidehi Chaudhari (Seed 4) bt Tanisha Kashyap 6-0,7-6(3); Sabhyata Nihalani bt Shreya Tatavarthy 6-1,6-1; Prinkle Singh bt Shreya Gulia 6-1,6-4; Akanksha Bhan bt Shivani Amneni 6-1,7-6(4); Humera Sheikh bt Harsha Challa 7-6(4), 2-6,7-6(9).