Sourabh staved off a challenge from Indonesia's Ihsan Maulana Mustofa, seeded sixth, in the second game to register a 21-11 22-20 victory, while 12th seed Sameer dumped Scotland's Kieran Merrilees 21-17 21-17 in another men's singles match.
Sourabh, who had won the Chinese Taipei Open recently, will next take on experienced World No. 13 Marc Zwibler of Germany, while younger brother Sameer will face Ukraine's Artem Pochtarov in the next round.
In the first game, Sourabh didn't face much resistance as he slowly and steadily marched towards his goal after opening up a slender lead early on. But the second game became a hard-fought affair when the Indonesian turned the tables on the Indian, who was leading 13-9 at one stage.
Ihsan fought back from 12-16 down to lead 17-16 but Sourabh ensured he had the last laugh in the 42-minute clash.
In a 39-minute clash, Sameer had to toil hard as despite his slender 7-5 lead in the opening game, Kieran kept breathing down his neck. The Indian finally broke off at 13-13 and never looked back.
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