Olympic medallists Saina Nehwal and P V Sindhu have booked their quarterfinal berths in the Women's Singles at the All England Open badminton championships. In second round matches in Birmingham today, while eighth seeded Saina defeated Fabienne Deprez of Germany 21-18, 21-10, sixth seeded Sindhu overcame Dinar Dyah Ayustine of Indonesia, also in straight games 21-12, 21-4.However, H S Prannoy made his exit from the Men's Singles. He lost to seventh seeded Houwei Tian of China in straight games 13-21, 5-21.