Star Indian shuttler Lakshya Sen suffered a shock defeat but the trio of Malvika Bansod, Aakarshi Kashyap and Unnati Hooda advanced to the women's singles second round after hard-fought victories in the USD 475,000 Thailand Open Super 500 tournament here on Wednesday. World No. 10 pair of Tressa Jolly and Gayatri Gopichand, currently the best-ranked Indians in the world, also made a positive start to their campaign, reaching the second round with a 21-15 21-13 win over Malaysia's Ong XY and C Ting. The third-seeded Indian combination, which is returning after missing the Sudirman Cup mixed team championships due to injuries, will next square off against Japan's Rui Hirokami and Sayaka Hobara.