World Junior Championships silver medallist Tanvi Sharma and Manraj Singh produced stunning upsets at the Syed Modi International Super 300, knocking out former world champion Nozomi Okuhara and HS Prannoy respectively to sail into the quarter-finals here on Thursday.

The 16-year-old Tanvi, who had reached the US Open Super 300 final earlier this year, fought back brilliantly to shock the second seed Okuhara 13-21, 21-16, 21-19 in a 59-minute thriller.