Feng, the second seed from Singapore, was beaten 11-2, 6-11, 11-5, 11-4, 11-5 by He Zhuojia of China at the Queen Elizabeth Stadium.

He does not even have a world ranking due to her absence from the international scene in recent years but was a winner at the ITTF Argentina Open in 2014.

South Korea's world number 134 Lee Eun-hye also continued the superb form she showed in ousting Japan's top-seed Kasumi Ishikawa in the first round.

She won 10-12, 12-10, 19-17, 12-10, 5-11, 11-7 against Chen Ke of China today. 

It proved a bad day for the host nation elsewhere in Hong Kong.

Lee Ho Ching, the 12th seed and sole home survivor in the women's singles draw, was beaten 5-11, 11-4, 11-5, 11-7, 10-12, 11-7 by Japan's fifth seed Mima Ito today.

Sweden's Jon Persson then stunned number one seed Wong in the men's singles draw.

Persson, who won a home World Team Championships bronze medal for Sweden in Halmstad earlier this month, clinched victory 11-9, 12-10, 9-11, 11-5.

Japan’s ninth seed Maharu Yoshimura followed his victory over China's three-time Olympic champion Zhang Jike yesterday by beating Egypt’s sixth seed Omar Assar 11-3, 11-9, 11-6, 11-7 today.

Zhou Qihao, the one Chinese player still standing, also accounted for Germany’s Patrick Franziska, the 11th seed, 12-10, 13-15, 11-9, 11-8, 12-10.

Action will continue tomorrow with the quarter-finals.