The Hong Kong Open finalist, Sameer reached the quarterfinals with a shocking 21-17 21-15 win in a 40-minute match.
The 22-year-old from Dhar, who had clinched his maiden Grand Prix Gold event at Syed Modi Internationals in January, will face either Denmark's Anders Antonsen or German Marc Zwiebler next.
"I had prepared for his game but he played better today. He is a tricky player with quality strokes. I think I am confident enough to go for my strokes. I will look to continue the momentum tomorrow," Sameer said after the match.
In the end, the scoreline read 19-21 21-14 20-22 in favour of sixth seed Ng Ka Long Angus as Sourabh left crestfallen.
While answering the difference between their games, Sameer made an observation, saying: "He (Sourabh) has a calm head and has a good rally game while I am more attacking, perhaps, if I can have his patience and he can have my aggression, we both will do well."
Former champion Kidambi Srikanth had such an off day that he completely misjudged the length of the shuttle and struggled with his strokes and got buried in a heap of unforced errors.
After 25 minutes, Rio Olympics bronze medallist Viktor Axelsen ended Srikanth's agony with a 21-7 21-12 win.
"Nothing went my way today. I was misjudging the shuttle completely. He was playing too well and I just couldn't compete," Srikanth said.
The Indian had some words of comfort from the strapping Dane.
Among others, B Sai Praneeth failed to match seventh seed Chou Tien Chen of Chinese Taipei and was outclassed 14-21 16-21 in 36 minutes.
Shruti Mundada and Anoushka Parikh were no match for the third seeded Japanese pair of Naoko Fukuman and Kurumi Yonao, while Syed Modi champions, Pranaav Jerry Chopra and N Sikki Reddy, seeded seventh, lost 18-21 19-21 to Russian combo of Evgenij Dremin and Evgenia Dimova.
Disclaimer: No Business Standard Journalist was involved in creation of this content
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