The third-seeded Japanese needed just 46 minutes to dispatch her South Korean rival 21-18, 21-13 at St. Jakobshalle in the Swiss city.

Sixth seed Bing Jiao He of China awaits in the last eight after defeating compatriot Yue Han 21-18, 21-14.

Seventh seed Ratchanok Intanon of Thailand will face Singapore's Jia Min Yeo after recording an 18-21, 23-21, 21-10 victory against Gregoria Mariska Tunjung of Indonesia.

Yeo defeated top seed Akane Yamaguchi in the second round and followed up by sending home eighth seed Thi Trang Vu of Vietnam with a 21-15, 14-21, 21-16 win.

Second seed Tzu Ying Tai from Chinese Taipei edged a tight battle with South Korean Kim Ga-Eun 24-22, 24-22.

Men's top seed Kento Momota cruised into the quarter-finals with a 21-19, 21-12 win against HS Prannoy.

Next up in his bid to retain the world title is a clash with 14th seed Lee Zii Jia of Malaysia.

Lee needed three sets to see off eighth seed Kenta Nishimoto 21-15, 11-21, 22-20.

Sixth seed Anthony Sinisuka Ginting of Indonesia will have to wait another year for world glory after he was sent crashing out of the tournament.

He lost to 16th seed B Sai Praneeth of India 21-19, 21-13.

In the women's doubles, Chinese pair Qing Chen Chen and Yi Fan Jia fought back from a set down to beat South Koreans Kim So-Yeong and Kong Hee-Yong 19-21, 21-17, 21-16.