Defending champion Saina Nehwal and two-time World Championship bronze medalist PV Sindhu advanced to the quarter-finals in India Open Super Series at the Siri Fort Sports Complex in New Delhi yesterday. In women's singles match, P V Sindhu defeated Thailand's Busanan Ongbumrungphan 17-21, 21-19, 21-16 and will take on Korea's Bae Yeon Ju in the quarter finals. Later in the day, Saina beat Nitchaon Jindapol of Thailand 21-19, 21-14 and set up a clash with Korean fifth seed Sung Ji Hyun.However, the highlight of the day was the stunning losses of two-time silver medalist Lee Chong Wei and five-time World Championship Lin Dan. Korea's Son Wan Ho stunned the six-time All England champion Lin Dan of China 21-13, 22-20 while top seed Lee suffered a 19-21, 19-21 loss to Hong Kong's Wei Nan.