Reigning Olympic women's singles champion Yu Fei Chen reached the All England Open final after knocking out top seed Akane Yamaguchi ©Getty Images

Women’s singles top seed Akane Yamaguchi of Japan was beaten in the semi-finals of the All England Open Badminton Championships in Birmingham by China’s Yu Fei Chen.

Fourth seed Chen, the reigning Olympic women’s singles champion, was a straight games winner against defending champion Yamaguchi 21-17, 21-8 in the Badminton World Federation World Tour Super 1000 event at the Utilita Arena.

She will take on An Se-Young of South Korea, who battled past Tai Tzu-Ying of Taiwan in a marathon battle.

An Se-Young dropped the first game 21-17, but battled back to win the next two 21-19, 24-22 to claim victory in one hour and 22 minutes.

The men’s singles final will be an all-Chinese affair between two unseeded players Yu Qi Shi and Shi Feng Li.

Shi beat fourth seed Lee Zii Jia of Malaysia 21-19, 21-13, while Li battled past Denmark’s Anders Antonsen in three games in the final match of the night.

Li ran out a 21-11, 19-21, 21-18 victor in a contest that lasted just over an hour and a half and finished after 11pm local time.

The finalists were also confirmed in the men’s, women’s and mixed doubles competitions.

Both top seeded pairings still remaining advanced, with Si Wei Zheng and Ya Qiong Huang of China overcoming Rehan Naufal Kusharjanto and Lisa Ayu Kusumawati of Indonesia 21-17, 13-21, 21-13 in a mixed doubles contest featuring some spectacular rallies.

The top pairing in the men’s Fajar Alfian and Muhammad Rian Ardianto of Indonesia ran out straight games winners 21-19, 21-17 against Chinese duo Ji Ting He and Hao Dong Zhou.

Across the five finals tomorrow players from only three countries - South Korea, China and Indonesia feature.