The Spaniard was beaten 15-21, 21-19, 18-21 by Yamaguchi, who goes on to contest tomorrow’s women’s singles final against Chinese Taipei’s Tai Tzu Ying - a 21-13, 20-22, 21-18 winner over Hong Kong’s Cheung Ngan Yi.

In the men’s singles competition of the Badminton World Federation (BWF) Super Series event, sixth seed Son Wan Ho of South Korea won his last-four encounter with fellow countryman Lee Hyun-il 21-14, 21-16.

Awaiting him in the final is Thailand’s Tanongsak Saensomboonsuk, who defeated France’s Brice Leverdez - the conqueror of top seed Lee Chong Wei of Malaysia - 21-9, 21-13.

Japan’s Ayaka Takahashi and Misaki Matsutomo remain on course for success in the women’s doubles after the top seeds comfortably overcame Thailand’s Sapsiree Taerattanachai and Puttita Supajirakul 21-17, 21-11.

Standing between them and the title are number two seeds Jung Kyung Eun and Shin Seung Chan of South Korea, who beat third seeds Greysia Polii and Nitya Krishinda Maheswari of Indonesia 21-13, 26-24.

There was disappointment for the home crowd in the men’s doubles as second seeds Mathias Boe and Carsten Mogensen lost 22-20, 15-21, 11-21 to fourth seeds V Shem Goh and Wee Kiong Tan of Malaysia.

Next up for Goh and Tan are Thailand’s Bodin Isara and Nipitphon Phuangphuapet, who defeated seventh seeds Angga Pratama and Ricky Karanda Suwardi of Indonesia 21-11, 21-18.

The mixed doubles final will feature Denmark’s Joachim Fischer Nielsen and Christinna Pedersen and China’s Zheng Siwei and Chen Qingchen after both pairings got the better of higher-seeded opposition.

Fifth seeds Fischer Nielsen and Pedersen overcame fourth seeds Chris Adcock and Gabrielle Adcock of England 21-16, 21-18, while eighth seeds Zheng and Chen beat seventh-seeded compatriots Lu Kai and Huang Yaqiong 21-19, 22-20.