Lakshya Sen mounted a remarkable comeback to become the first male Indian shuttler to qualify for the singles semifinals at the Olympic Games, outwitting Chinese Taipei's Chou Tien Chen in an intense battle, here on Friday. The 22-year-old from Almora fought his heart out against the world number 11 Taiwanese after losing the first game to eventually prevail 19-21 21-15 21-12 in the men's singles quarterfinal that lasted 75 minutes. PV Sindhu and the pair of Satwiksairaj Rankireddy and Chirag Shetty had lost their respective matches on Thursday to bow out of the Games.