Olympic silver medallist P.V. Sindhu battled past Chinese Sun Yu to win the women's singles title of the China Superseries Premier badminton tournament here on Sunday.The Indian seventh seed won the first game 21-11 but lost the next 17-21 before registering a 21-11 triumph in the final game to clinch the title. The final lasted an hour and nine minutes. It was 21-year-old Sindhu's maiden Superseries Premier title.This win was Sindhu's third in six games against Sun.