Sumit overcame stiff resistance from Siddharth Vishwakarma before prevailing 6-2 7-6, while second seed Prajneesh came back from a set down to beat beat Aruay Goveas 4-6 6-4 6-4.
Other results (with seeds in brackets): N Sriram Balaji (6) bt Niki Kaliyanda Poonacha 6-2 5-7 6-3; N Vijay Sundar Prashanth (5) bt Mohit Mayur Jayaprakash 6-4 6-3; Sasi Kumar Mukund (7) bt Kaza Vinayak Sharma 7-6 (3) 6-4; Vishnu Vardhan (3) bt Manish Sureshkumar 2-6 6-2 7-6 (3); Sanam Singh (4) bt Dhruv Sunish 6-3 6-4; Sidharth Rawat (8) bt Abhinav Sanjeev Shanmugam 6-4 6-2.
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