World No.11 Sen suffered a shock 17-21, 11-21 defeat to Indonesia’s World No. 38 Mohammed Zaki Ubaidillah, while Prannoy lost 17-21, 22-20, 22-24 to Japan’s Kodai Naraoka.

Earlier, Sindhu went down 21-19, 18-21, 15-21 to Japanese top seed Akane Yamaguchi, while later in the day, Sen lost 19-21, 16-21 to home hope Kunlavut Vitidsarn