Olympic medallist shuttler PV Sindhu suffered an unexpected loss in the second round but Kidambi Srikanth and Sameer Verma advanced to the quarter-finals to keep India's flag flying at the Hong Kong Open here yesterday.

World No. 4 Sindhu, who was seeded third here, was shown the door by Hyun Ji Sung of Korea 24-26, 20-22. With Sindhu's exit, India's challenge ended in the women's singles after Saina Nehwal had made a first round exit.