Prannoy displayed great performance to fight his way to the next round as he defeated Yun Hu 19-21, 21-17, 21-15.
The Hong Kong player, formerly ranked No. 4, had the upper hand for most of the match.
Olympic silver medalist Sindhu, seeded second, disposed off Hong Kong's Leung Yuet Yee 21-18, 21-10 to set up a clash with Japan's Aya Ohori. The Chinese won 21-11, 19-21, 21-19 in 55 minutes. Nehwal staved off a tough challenge in both the games from the 44th ranked Mette Poulsen of Denmark to register a 21-19, 23-21 victory in 46 minutes. The decider was, however, a closely contested affair with neither players giving room to the other but it was Lee who held his nerve to clinch a thriller. Hu saved one before Prannoy sealed it without much ado. In men's singles competition, Commonwealth Games champion Kashyap squandered an opening game advantage to go down narrowly 21-15 9-21 20-22 to Korean Lee Dong Keun in a match that lasted an hour and nine minutes.
Sourabh Verma too exited the competition, losing to Indonesian Tommy Sugiarto 15-21, 8-21 in 30 minutes. Singapore Open Superseries victor B Sai Praneeth could not give any resistance to the second seeded Son Wan Ho and fell 8-21, 16-21.
In the men'sdoubles, Indian duo Arjun MR and Ramchandran Shlok saw off local pair Li Kuen Hon and Yeung Shing Choi 21-14, 21-18 in the first match.