Top seed Banthia had things in control barring the extended second set when getting past Thai qualifier Akanit Pumjit 6-2 7-5 in a boys' singles pre-quarterfinal match.
Also through to the last eight with Banthia were his Indian compatriots Nitin Kumar Sinha, a wild card, seventh seed Dhruv Sunish, Digvijay Pratap Singh and Megh Bhargav Patel who upset second seed J Trotter of Japan.
Barring Patel, who was stretched to three sets by his seeded Japanese rival before closing out the match 2-6 7-5 6-1, others scored straight-set victories over their respective pre quarter final rivals.
In the girls' singles, India's top-seeded Mahak Jain, wild card Salsa Aher, seventh seed Vaidehi Chaudhari and second seed Mihika Yadav made the last eight grade.
Also through were no. 4 seed Lee Kuan Yi of Taipei, fifth seed M Nirundorn of Thailand, along with Mana Kawamura and Funa Kozaki, both of Japan.
The results (Pre quarter finals):
Boys singles: 1-S Banthia (Ind) bt A Pumjit (Thai) Ho 6-3 7-5; Ho Ray (Tpe) bt 5-Seita Watanabe (Jpn) 6-3 6-3; 3-T Ichikawa (Jpn) bt Ho Denton (HKG) 6-1 6-3; Nitin Kumar Sinha (Ind) bt Sacchitt Sharrma (Ind) 7-5 6-3; 7-Dhruv Sunish (Ind) bt K Samrej (Thai) 6-4 6-3; Christian Didieer Chin (Mas) bt 4-Ryuki Mastsuda (Jpn) 7-5 6-1; Digvijay Singh Pratap (Ind) bt 8-P Kovapitukted (Thai) 6-4 6-2; Megh Bhargav Patel (Ind) bt 2-J Trotter (Jpn) 2-6 7-5 6-1.
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