India's Ashmita Chaliha and Rakshitha Ramraj will square off in the women's singles semifinals of the USD 250,000 Korea Masters Super 300 badminton tournament after registering hard-fought wins in their respective quarterfinals here on Friday. World No. 50 Ashmita produced the biggest upset of the tournament so far, shocking top seed and World No. 22 Hina Akechi of Japan 20-22 21-15 21-19 in a gripping quarterfinal at the Asan Yi Sun-sin Gymnasium. The victory also helped the Indian avenge a defeat in their only previous meeting at the Malaysia Super 100 last year.

Rakshitha, meanwhile, came back from a game down to upset third seed and compatriot Tanvi Sharma 18-21 21-19 21-18 in a contest that lasted over an hour. It was her fourth win over Tanvi, who had claimed her maiden BWF title at Taipei Open last week. However, India's Krishna Prasad Garaga and Pruthvi Krishnamurthy Roy crashed out after suffering a 7-21, 8-21 loss to Malaysia's Man Wei Chong and Soh Wooi Yik.