Pranaav Jerry Chopra and N Sikki Reddy, who clinched their maiden Grand Prix Gold title at Syed Modi Internationals in January, also reached the third round of the mixed doubles event after their opponents gave them a walkover.
In a 43-minute match, fifth seeded Prannoy trounced Scotland's Kieran Merrrilees 21-17 21-19 to set up a meeting with 10th seeded Chinese Qiao Bin.
Subhankar, who won the Iceland International in January, defeated Slovenia's Iztok Utrosa 21-17 21-18. The 23-year-old Indian will face Japan's Kanta Tsuneyama.
Fourth seeded Indian pair of Pranaav and Sikki reached the pre-quarters after Sweden's Nico Ruponen and Amanda Hogstrom handed them a walkover.
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Rio Olympians Manu Attri and B Sumeeth Reddy suffered a 15-21 19-21 loss to top seeded Chinese combo of Chai Biao and Hong Wei.
It was also curtains for Sri Krishna Priya Kudaravalli in women's singles after she lost 18-21 8-21 to seventh seeded Indonesian Fitriani Fitriani.
Mixed doubles pair of Rohan Kapoor and Sanjana also lost 16-21 19-21 to France pair of Bastian Kersaudy and Lea Palermo.
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