Mia Blichfeldt set up a semi-final tie with top seed Tai Tzu-ying at the Badminton World Federation (BWF) Yonex Thailand Open in Bangkok.
The Dane overcame home favourite Busanan Ongbamrungphan 21-13, 21-18 to progress at the Impact Arena.
Blichfeldt, gold medallist at the Minsk 2019 European Games, is set to meet Chinese Taipei star Tai in the final four.
Tai eased past Canadian eighth seed Michelle Li 21-11, 21-13 in the quarter-finals.
The remaining women's semi-final is set to take place between An Se-young and Carolina Marin.
South Korea's An won 22-20, 21-12 against Ratchanok Intanon, another home favourite.
"It was good in the beginning, but after that I could only follow her game," a frustrated Intanon said.
"She played at a slower pace and controlled everything.
"She always made me play her game.
"That’s not in my nature and I could not control the shuttle."
An is scheduled to play Marin next after the Spaniard defeated Thailand's Supanida Katethong 21-16, 21-16.
In the men's contest, second seed Choue Tien-chen overcame Malaysia's Lee Zii Jia 21-17, 21-15.
The player from Chinese Taipei will now play Angus Ng Ka Long of Hong Kong, a 21-17, 21-12 victor against compatriot Lee Cheuk Yiu.
Denmark will also be represented in the men's semi-finals after Viktor Axelsen eased past Jonatan Christie of Indonesia.
Axelsen is due to play another Indonesian, Anthony Sinisuka Ginting, who battled to a 21-14, 19-21, 21-5 win against Dane Rasmus Gemke.
The semi-finals are scheduled to be held tomorrow.