Sourabh sailed into the third round after his Chinese opponent Xue Song, seeded 14th, retired when he was trailing 9-16 in the opening game. The Chinese Taipei Open winner will next take on sixth seed Ihsan Maulana Mustofa of Indonesia.
Younger brother Sameer, seeded 12th, brushed aside Finland's Eetu Heino 21-10 21-16 in 30 minutes to set up a clash against Scotland's Kieran Merrilees.
India's Prajakta Sawant and her partner Zhi Qing Lee of Malaysia also registered a hard-fought win over Denmark pair of Julie Finne-Ipsen and Rikke Soby Hansen 22-20 17-21 21-15 in a 49-minute women's doubles match.
They will next face top seed Chen Qingchen and Jia Yifan of China.
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Promising shuttler Tanvi Lad bowed out in the opening round after losing to Gayle Mahulette of Netherlands 14-21 17-21 in a 31-minute women's singles clash.
In another men's doubles match, Malaysia's Yogendran Khrishnan and Kamaldeep Singh lost 6-21 11-21 to English combo of Matthew Nottingham and Harley Towler.
Prajakta and Yogendran will open their mixed doubles campaign against Anders Skaarup Rasmussen and Maiken Fruergaard of Denmark.
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