Yamaguchi, the reigning world champion, was beaten 21-19, 21-14 by China's unseeded hope Wang Zhiyi.

It continued a fine tournament for Wang at the Istora Gelora Bung Karno venue in Jakarta, after she defeated Spain's Rio 2016 Olympic gold medallist Carolina Marín yesterday.

China were in great form elsewhere in the women's draw as well as the country sealed three of the four semi-final places.

Tokyo 2020 Olympic champion Chen Yufei, seeded fourth, beat Japan's sixth seed Nozomi Okuhara, the 2017 world champion, 21-16, 21-10.

He Bingjiao also won for China by ending the title defence of South Korea's third seed An Se-young, 15-21, 21-17, 21-14.

Second seed Tai Tzu-ying of Chinese Taipei will be the only non-China player in the last four after her 21-13, 21-13 win over Line Kjærsfeldt of Denmark.

Tai will now meet Chen tomorrow, with Wang playing He.

In the men's event, Denmark's Olympic gold medallist and defending champion Viktor Axelsen survived a scare but eventually progressed.

The top seed and 2017 world champion dropped a game but came through in the end against Indonesia's fifth seed Anthony Sinisuka Ginting, 21-13, 19-21, 21-9.

Malaysia's sixth seed Lee Zii Jia is now the next highest-ranked player left in the draw after he saw off Singapore's reigning world champion Loh Kean Yew 21-18, 16-21, 22-20.

Another three game clash saw China's Zhao Junpeng prevail against Lee Cheuk Yiu of Hong Kong, 21-14, 17-21, 21-11.

H.S Prannoy of India progressed by beating Rasmus Gemke of Denmark 21-14, 21-12.

In tomorrow's semi-finals, Axelsen will play Lee with Zhao squaring off against Prannoy.

The tournament is ranked as a Super 1000 event on the BWF World Tour.