World No 64 Subhankar, who beat Lin Dan in the second round beat seventh seeded Englishman Toby Penty 21-16 21-9 in only 32 minutes.
However Kashyap lost his quarter-final against France's Toma Junior Popov 16-21 18-21 inside 38 minutes.
In the women's singles quarer-final, Sayali Rane lost her match against Denmark's
Line Højmark Kjaersfeldt 14-21 9-21.
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