Jayant prevailed over Malaysia's Anson Cheong, eighth seed, 21-15 17-21 21-12, Ayush beat Malaysia's Zhen Yi Ong 21 -17 17-21 21-11, while Varun thrashed Thailand's Panitchaphon Teeraratsakul 21-13 21-12.
Siddhanth Gupta, however, suffered a 16-21 21-18 13-21 loss to Japan's Riki Takei, the fifth seed in the pre- quarterfinals. He had defeated Vietnam's Thanh Dat Bui 21-18 21-13 earlier in the day.
Third seed Samiya Imad Farooqui and Aashi Rawat also entered the final eight in under 15 womens singles. While Samiya defeated Chinese Taipei's Lin Tzu-Yun 21-10 21-16, Aashi defeated Indonesias Ester Nurumi Tri Wardoyo 14-21 21- 14 21-16 in another match.
In under 17 womens singles, Malvika lost 17-21 19-21 to Chinese Taipei's third seed Hung En-Tzu in the third round, while second seed Aakarshi Kashyap also lost 18-21 16-21 to Japans Riko Gunji.
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Earlier, in under-17, Maisnam Meiraba defeated Japan's Takumi Shibata 21-23 21-11 21-13, while Aakash dumped Hong Kong's Wang Joshua Che 21-14 21-18 in the second round. However, Amit Rathore and Sathish Kumar Karunakaran bowed out of the tournament.
In women's singles U-17, Ritika Thaker, the fourth seed, lost to Hsieh Hsin Yu of Chinese Taipei 18-21 18-21.
However, Punshiba Yengkhom lost 17-21 21-11 13-21 to seventh seeded Indonesian Mawardi Putra Damas, while fourth seeded Vikas Yadav went down fighting 9-21 21-11 17-21 to Muhammad Fazriq Mohamad Razif.
In under 15 women's singles, Kavipriya Selvam, seventh seed, overpowered Thailand's Kanyanat Sudchoeichom 17-21 21-17 21-9, Samiya Imad Farooqui, third seed, beat Thailand's Thamonwan Nithiittikrai 21-15 22-20, Aashi Rawat defeated Thailand's Krittaporn Jiantanet, the second seed, 21-13 21-13.