Ace shuttler Saina Nehwal has entered the quarter-finals of the Women's Singles at the Australian Open Super Series badminton tournament. In Sydney on Thursday, the World Number One defeated 9th ranked Sun Yu of China in three games 21-19 19-21 21-14 in a match that lasted an hour and 18 minutes. The defending champion will next take on two-time All England champion Shixian Wang, against whom Saina has a close 6-5 record in 11 meetings. However, it was curtains for World No. 4 Kidambi Srikanth and 2010 Commonwealth Games champion pair of Jwala Gutta and Ashwini Ponnappa on Thursday. Fourth seed Srikanth went down against China's Tian Houwei 21-18 17-21 13-21 in men's singles, while Jwala and Ashwini lost to fourth seeded Indonesian pair of Nitya Krishinda Maheswari and Greysia Polii14-21 10-21 in a women's doubles match.