The 20-year-old Chinese player headed into the gold medal match as the clear underdog, with Chou lying eighth in the world rankings.

Zhao was able to continue his momentum from his shock semi-final win against Tzu Wei Wang of Chinese Taipei, quickly winning the opening game 21-11.

He then edge dout Chou 21-19 in the second game to secure an impressive victory and a maiden Grand Prix Gold title.

Chen Yufei earned victory in the women’s singles final after fighting off the challenge of her Chinese compatriot Chen Xiaoxin.

The sixth seed was the favourite to win the match but had cause to be wary after Xiaoxin’s surprise win over Cheung Ngan Yi of Hong Kong yesterday.

A convincing opening game saw the prospect of another upset look unlikely, with Chen Yufei winning 21-13.

She was forced to hold off a spirited display from her team-mate in the second game, but ultimately came through to take an 21-13, 21-18 victory.

There was further success for China in the mixed doubles event, with Zhang Nan and Li Yinhui triumphing in the final.

The unseeded duo saw off the challenge of Hong Kong’s Tang Chun Man and Tse Ying Suet, beating the seventh seeds 21-19, 21-15.

In the women’s doubles, China top seeded pairing of Chen Qingchen and Jia Yifan took the title, as they beat Indonesia’s Anggia Shitta Awanda and Mahadewi Istirani Ni Ketut 21-15, 21-13.

Only the men's doubles ended without a Chinese winner as Zhang Nan and Lu Kai fell to defeat in the final, despite winning the opening game.

They were beaten 17-21, 21-18, 21-19 by the second seeds Yang Lee and Jhe-Huei Lee of Chinese Taipei.