Indian shuttler Lakshya Sen crashed out in the opening round of the Thailand Open, while Aakarshi Kashyap and Unnati Hooda advanced after hard-fought victories in the Super 500 tournament here on Wednesday. Sen fell to Ireland's Nhat Nguyen in a tense three-game battle, losing 18-21 21-9 17-21 in a men's singles match that lasted one hour and 20 minutes. After dropping the first game, Sen found his rhythm in the second, dominating with aggressive rallies. However, Nguyen held his nerve in a close-decider, edging ahead at 17-13 before sealing the win.