On the opening day of Singapore Open Badminton Tournament, Indian duo Jishnu Sanyal and Jwala Gutta has lost to Tang Chun Man and Tsz ka Chan of Hongkong in the qualifying match 14-21, 18-21 .The main draw is scheduled to begin tomorrow. Top Indian shuttlers, Saina Nehwal, PV Sindhu and P. Kashyap are taking part in the tournament.