Nandrajog drubbed local player Sachin Ugade in straight games, while third seed Jalan waged a grim battle against another Mumbai player, Pranay Merchant and fought back from 1-2 down to win in five games in the quarter-finals.
Also through were two other Maharashtra players - Ness Billimoria and Aditya Jagtap.
Meanwhile, Saisha Gupta shocked top seed Kaavya Bansal to enter the girls' under-13 final, while Yoshna Singh upset second seed Aishwarya Khubchandani in the girls under-15 semi-finals.
Results: Men (Quarter-finals): Ness Billimoria bt Vicky Gagat 13-11, 11-3, 11-2; Aditya Jagtap bt Guhan Senthilkumar (TN) 11-7, 5-11, 11-4, 11-7; Rishi Jalan (Del) bt Pranay Merchant 5-11, 11-8, 7-11, 11-8, 12-10; Gaurav Nandrajog (Del) bt Sachin Ugade 11-3, 11-2, 11-5.
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Boys U-15 (Semi-finals): Neel Joshi bt Aakash Gupta 11-4, 11-6, 11-4; Advait Adik bt Deepak Mandal 11-7, 6-11, 11-5, 11-5.
Boys U-17 (Semi-finals): Yash Fadte (Goa) bt Suraj Chand 11-13, 11-2, 11-9, 11-3; Rahul Baitha bt Aryan Parekh 11-5, 12-10, 13-11, 8-11, 11-8.
Girls U-15 (Semi-finals): Ananya Dabke bt Anannya More 11-3, 9-11, 11-5, 11-6; Yoshna Singh bt Aishwarya Khubchandani 7-11, 11-7, 9-11, 11-8, 11-5.
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