In quarter-final encounters, Tamil Nadu team comprising of singles players M Kaushik and A Musaraf, and the doubles pair of Guruprasath and Sandeep defeated Vidarbha 3-0.
In contrast Maharashtras singles players Ojas Jadhav and Mayuresh Naik encountered tough fight from Assam while the hosts doubles pair of Om Taware and Pratham Mehta had it easy before the hosts romped to a 3-0 win.
In the other quarter-final matches, Bihar prevailed over Hyderabad and Delhi defeated Uttar Pradesh by identical 2-1 margins to also progress to the last four.
However, former national champion Nagsen Etambe of Bank of India crashed at the first hurdle, losing to Tamil Nadus G Mukesh 6-25, 14-25.
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In doubles action, Sangeeta Chandorkar and Kavita Somanchi of Reserve Bank of India defeated Mamata Kumari and Nisha Kumari of Bihar in straight games at 25-9, 25-6 to reach the womens doubles semi-finals.
They fought back after losing the first game to score over S. Aditya and Shaikh Mohd of Telangana 6-25, 25-14, 25-10 in a close quarter-final match.
Results : Team championship - Sub-Junior Boys (quarter-finals): Maharashtra beat Assam 3-0 (Ojas Jadhav bt Wakib Iqbal Hussain 12-5, 7-13, 14-6; Mayuresh Naik bt Sahil Rahman 6-18, 14-8, 15-7; Om Taware/Pratham Mehta bt Dipak Rai/Faruq Sheikh 21-0, 22-0).
Bihar beat Hyderabad 2-1 (Sohaib Alam bt Sabeer Jameel 21-0, 21-6; Md. Faiyaz Ali lost Syed Asif Ali 1-21, 8-15; Aditya Raj/Md. Imran Ansari bt Afran Ahmed/U. Girivardhan 19-12, 21-0).
Tamil Nadu beat Vidarbha 3-0 (M. Kaushik bt Adi Samubre 10-5, 12-9; A. Musaraf bt Sheikh Nadim 16-10, 20-16; Guruprasath/Sandeep bt Mohd. Amin/Tanish Markande 21-8, 21-3).
Womens doubles (quarter-finals): Nagajyoti/Ilavazhaki (PSPB) bt Sneha More/Meenal Lele (Mah) 25-10, 25-4; R Gayatri/Ashmabarthini (TN) bt Nagajyoti/Neha Reddy (CCSCSB) 25-13, 25-13; Sangeeta Chandorkar/Kavita Somanchi (RBI) bt Mamata Kumari/Nisha Kumari (Bhi) 25-9, 25-6; Rashmi Kumari/Kajal Kumari (PSPB) bt Maitreyee Gogate/Priti Khedekar (Mah) 25-18, 25-5.
Mens doubles (quarter-finals): Yogesh Pardeshi/Ramesh Babu (PSPB) bt Bharati Dasan/Kishor Kumar (CCSCSB) 25-8, 25-4; Zaheer Pasha/Ravi Waghmare (RBI) bt S. Aditya/Shaikh Mohd (Tel) 6-25, 25-14, 25-10; K. Srinivasan/Sandeep Deorukhkar (PSPB) bt Dilesh Khedekar/R.D. Dinesh Babu (CAG) 25-6, 24-25, 25-5; Prashant More/L. Suryaprakash (RBI) bt M.A. Hakim/Jiben Deka (BSNL) 25-2, 25-3.