India's two-time Olympic medallist P.V. Sindhu was back at her valiant best as she overcame a first-game deficit to down Vietnam's Thuy Linh Nguyen in a marathon 91-minute battle and book a semifinal berth at the Arctic Open Super 500 tournament here.
The eighth-seeded Indian won 20-22, 22-20, 21-18 to halt a four-match winning run by of the unseeded world No 26 Nguyen.
Struggling to get into her elements before the Paris Olympics, Sindhu will face fifth seed and world No 11 Wang Zhi Yi of China later on Saturday in her bid to win the first BWF title of the season.