India’s Devika Sihag pulled off a big upset at the Thailand Masters Super 300 badminton tournament, stunning home favourite and top seed Supanida Katethong in straight games to reach the women’s singles semi-finals here on Friday.

The 20-year-old unseeded Indian, who claimed her maiden BWF International Challenge title at the Malaysia International last year, kept her composure to seal a 21-19, 21-18 victory in the quarter-finals that lasted just 40 minutes.