In the other boys U-16 matches, Saurav Kalkal was pushed to three sets by Akash Nandwal before the Delhi boy managed to prevail 6-0 4-6 6-2 here at the R K Khanna Tennis Complex.
Param Pun was at the receiving end, losing to Kushaan Nath 3-6 0-6, while Chandigarh boy Digvijay Pratap defeated Sahil Garware 6-2 6-3.
Rishab Sharda also did well to reach the third round with a 6-2 6-1 win over Pallav Kumar Rousha.
Sumit will next face S Manish of Tamil Nadu who set-up a third-round clash with the top seed following his 6-0 6-1 win against Nikhil Deshmukh.
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Second seed Parikshit Somani also had an easy outing. He posted a 6-1 6-1 win over Rishab Sharda to storm into the next round.
It was easy for the other seeded players as well. Third seed Nitin Kumar Sinha beat Sacchit Sharrma 6-0 6-4, while Yugal Bansal, fourth seed, got the better of Ankit Rao 6-1 6-2, and Dhruv Sunish overcame Prakrut Kartik Patil 6-2 6-1.
In the girls U-14, wild card entrant Seerat Sidhu will take on top seed Zeel Desai in the third round after she knocked out unseeded Nikay Parikh Ishita 6-4 6-0.