London Olympics Bronze medalist Saina Nehwal and three other Indian shuttlers today advanced to the pre-quarterfinals of the Singapore Open Super Series Badminton tournament. In the Women's Singles, second seed Saina defeated local favourite Juan Gu, 21-14, 23-21. The 23-year-old from Hyderabad will next take on Japanese Eriko Hirose, who holds a 3-2 record against the Indian.In the Men's Singles, Sai Praneeth notched up a stunning straight-game victory over world number four Yun Hu of Hong Kong. The world number 61 Indian brushed aside the second seeded shuttler 21-9, 21-10 in a match that lasted 30 minutes. However, Risinig Indian shuttler Srikanth K. lost to Tien Minh Nguyen in the opening round. Srikanth K., who came in hot as the Indonesian Open champion, was ousted, 21-19, 16-21, 12-21.In the Mixed Doubles, the duo of Arun Vishnu and Aparna Balan also made it to the last-16 stage.The Indians, who ended on the losing side include, Ajay Jayaram, Sourabh Verma and PC Thulasi.