Eighth seed Sourabh, who has clinched three titles -- TATA Open, Austrian International Challenge and Iran Fajr International Challenge recently -- defeated compatriot Chetan Anand 21-14 21-17 to set up a clash with ninth seed Kazumasa Sakai of Japan in the next round. Sakai beat another Indian Anup Sridhar 21-13 21-11 in another match.
Sai Praneeth B, H S Prannoy and RMV GuruSaidutt also reached the pre-quarterfinals but it was curtains for Aditya Prakash in the men's singles competition.
However, young Aditya lost 17-21 10-21 to 15th seed Simon Santoso from Indonesia in another second round match.
In the mixed doubles, eighth seeded Indian pair of Pranaav Jerry Chopra and Siki Reddy N defeated Malaysian combo of Chee Tean Tan and Shevon Jemie Lai 21-16 21-14.
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Prajakta and her partner Arathi Sara Sunil also lost in the women's doubles competition after the Indian pair retired midway against Chinese combo of Dongni Ou and Mengjing Xiong while lagging 2-21 5-13.