Third seed in the men's singles, Chen became the latest victim of the unseeded 21-year-old, who also knocked out sixth seed Indonesian Jonatan Christie in the opening round of the world's oldest badminton tournament at Arena Birmingham. 

The victory looked comfortable for the Malaysian, a 21-12, 21-18 winner to make the semi-finals where he is set to  face second seed, Denmark's Viktor Axelsen after he made short work of seventh seed, China's Shi Yu Qi, winning 21-15, 21-7 in this Badminton World Federation Super 1000 Series event. 

Number one seed Chou Tien Chen of Chinese Taipei made quick work of compatriot Wang Tzu Wei in a 21-11, 21-12 win and will play Denmark's fifth seed Anders Antonsen who defeated his childhood friend Rasmus Gemke 21-10, 21-13.

In the women's singles, the number one seed Chen Yu Fei won in three sets to finish the run of fifth seed Thailand's Ratchanok Intanon coming from a set down to win 17-21, 21-15, 21-17.

Fourth seed Japan's Nozomi Okuhara faced a similar turnaround against India's Venkata Sindhu Pusarla with a 12-21, 21-15, 21-13 win and is scheduled to meet Chen in the semi-finals.

On the other half of the bracket, Spain's eighth seed and Olympic gold medallist Carolina Marin won in straight sets against Japan's third seed Akane Yamaguchi and is now due to play Chinese Taipei's second seed Tai Tzu Ying, who defeated Thailand's Pornpawee Chochuwong in the final match of the day. 

The top seeds in the men's doubles, Marcus Fernaldi Gideon and Kevin Sanjaya Sukamuljo of Indonesia made it safely through to the final four with a 21-17, 21-19 win over Malaysia's Aaron Chia and Soh Wooi Yik.

Now they will play seventh seeds Lee Yang and Wang Chi-Lin of Chinese Taipei after they defeated Chinese pair Huang Kai Xiang and Liu Cheng in three sets 18-21, 21-18, 21-14.

Russia's Vladimir Ivanov and Ivan Sozonov are also through to the semi-finals after ending the run of England's Marcus Ellis and Chris Langridge and are set to play Japan's Hiroyuki Endo and Yuta Watanabe who toppled second seeds Mohammad Ahsan and Hendra Setiawan 21-19, 21-18.

In the women's doubles, the top two seeds were knocked out with Chinese top seeds, Chen Qing Chen and Jia Yi Fan losing 21-12, 20-22, 21-12 to Japan's seventh seeds, Misaki Matsutomo and Ayaka Takahashi.

Matsustomo and Takahashi will face compatriots Yuki Fukushima and Sayaka Hirota after the third seeds defeated South Korea's Kim So-yeong and Kong Hee-yong 21-17, 23-21.

Second seeds, Japan's Mayu Matsumoto and Wakana Nagahara were defeated by sixth seeds, Du Yue and Lin Yin Hui in three sets, with the Chinese duo now due to take on South Korea's fourth seeds Lee So-hee and Shin Seung-chan who won an all-Korean game against Chang Ye-na and Kim Hye-rin. 

England's Marcus Ellis and Lauren Smith continued their Cinderella story in the mixed doubles, making the semi-finals after a 24-26, 22-20, 21-11 comeback victory against Hong Kong's Tang Chun Man and Tse Ying Suet.

Their opponents in the next round also pulled off an upset as fifth seeds Praveen Jordan and Melati Daeva Oktavianti of Indonesia defeated China's Wang Yi Lyu and Huang Dong Ping, the highest seeds left in the competition. 

The highest seeds are now Thailand's number three Dechapol Puavaranukroh and Sapsiree Taerattanachai, who won comfortably against Indonesia's Hafiz Faizal and Gloria Emmanuelle Widjaja.

They are now due to play sixth seeds Seo Seung-jae and Chae Yujung of South Korea, who ended the run of Dutch duo Robin Tabeling and Selena Piek.