Thai teenager Ratchanok Intanon took the women's singles title, beating China's Olympic champion Li Xuerui 22-20, 18-21, 21-14 in a massive upset.
Ratchanok, 18, becomes the first ever Thai player to win gold at the world championships after defeating 22-year-old top-seed Li.
At the end of the match Ratchanok dropped to her knees in tears before bowing to an applauding stadium crowd.