Sourabh, seeded 12th, survived a challenge from compatriot Anand Pawar 21-17 20-22 21-14, while third seed Praneeth, who won the Singapore Open last month, defeated Malaysia's R Satheishtharan 21-15 21-13 in another match.
Young shuttler Sai Uttejitha Rao Chukka dished out a gallant fight to reach the second round with a 13-21 24-22 27 -25 win over Indonesia's Jesica Muljati in women's singles that lasted an hour and 16 minutes.
Kashyap, who had defeated Slovekia's Milan Dratva 21-6 21-14 in his opening match that started past midnight, went down 14-21 18-21 to second seeded Marc Zwiebler of Germany in the second round match, which took place in less than 12 hours of his first-round clash.
Shreyansh lost 9-21 18-21 to local shuttler Suppanyu Avihingsanon, while Malaysian Daren Liew ended Subhankar's campaign with a 10-21 21-15 21-19 win.
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Women's doubles pair of Meghana Jakkampudi and Poorvisha S Ram also crashed out after losing 10-21 18-21 to Indonesian combo of Tania Oktaviani Kusumah and Nisak Puji Lestari.
Prajakta Sawant and her Malaysian partner Yogendran Khrishnan lost 13-21 12-21 to local combo of Chaloempon Charoenkitamorn and Chasinee Korepap in mixed doubles.
In men's doubles, Arjun M R and Ramchandran Shlok's spirited effort ended in a 21-15 12-21 13-21 loss to local shuttlers Tinn Isriyanet and Kittisak Namdash.
Francis Alwin and Tarun Kona also lost 9-21 18-21 to Singapore combo of Yong Kai Terry Hee and Kean Hean Loh.