Indian shuttler B Sai Praneeth advanced to the quarterfinals of the Thailand Grand Prix Gold Badminton after notching up a straight-game win over Malaysia's Iskandar Zulkarnain in Bangkok today.The Singapore Open champion defeated ninth seed Zulkarnain 21-13 21-18. The third seeded Indian will now face Thailand's Kantaphon Wangcharoen tomorrow.However, it was curtains for Sourabh Verma and Sai Uttejitha Rao Chukka in men's and women's singles competition.