Okuhara began as the underdog heading into the contest, with her rival bidding for her third title at the annual Championships.

The youngster, though, dominated the early stages of the match to claim the opening game 21-11.

Shixian hit back, however, to win the second 21-16 to force the contest into a decider.

Neither player was able to take full control of the contest as both edged towards the title.

Okuhara eventually held her nerve to win the game and the match 21-19.

Her victory meant that she had become the first Japanese woman to since Hiroe Yuki in 1977 to win the title.

While Okuhara was experiencing winning at the tournament for the first time, China’s Lin Dan celebrated his sixth men’s crown.

The double Olympic champion brushed aside compatriot Tian Houwei 21-9, 21-10 in the final to win the title for the first time since 2012.

“It is the best I have played all week,” Lin said.

“I have worked hard, played well and I know that I can still do it.

“I just want to show the rest of the world that I am still the best.”

Indonesia’s Praveen Jordan and Debby Susanto were crowned mixed doubles champions in similarly emphatic fashion.

They brushed aside Denmark’s Joachim Nielsen and Christinna Pederson 21-12, 21-17.

In the women’s doubles Misaki Matsutomo and Ayaka Takahashi cruised to a 21-10, 21-12 win over China’s Tang Yuanting and Yu Yang.

The unseeded Russian pairing Vladimir Ivanov and Ivan Sozonov clinched a surprise win in the men’s doubles event.

They came from behind to beat Japanese sixth seeds Hiroyuki Endo and Kenichi Hayakawa 21-23, 21-18, 21-16.