Second seed Nozomi Okuhara was the biggest casualty at the Singapore Open on Thursday, beaten in straight games by unseeded Chinese shuttler Sun Yu.
Sun found herself trailing 6-12 in the first game but totally turned the tables from there.
After wrapping up the first game, she led from start to finish in the second to notch up a 21-16, 21-11 victory in just 46 minutes.
Sun will next try and topple sixth seed Sunh Ji Hyun in the quarter-finals.
Top seed Carolina Marin of Spain kept her Singapore hopes alive with a 21-19, 21-15 victory over Thailand’s Nitchaon Jindapol.
She moves on to face eighth seed Akane Yamaguchi, after the Japanese shuttler defeated Canada’s Michelle Li 21-12, 19-21, 21-8.
Also advancing was third seed Ratchanok Intanon of Thailand, after topping Hsu Ya Ching 21-16, 21-19.
She will meet countrywoman Porntip Buranaprasertsuk in the last eight, after the unseeded player upset Chinese fifth seed Wang Yihan 21-15, 21-15.
There were also wins for Beiwan Zhang of the United States and China’s He Bingjiao.