Ratchanok Intanon suffered a shock defeat at the hands of her Thai compatriot Pornpawee Chochuwong at the HSBC BWF World Tour Finals 2020 which started on Wednesday.
Pornpawee, ranked fifth in the women's singles category, took 62 minutes to upset World No.3 Ratchanok 15-21, 21-11, 21-18 in Group B that included No.2 Tai Tzu-ying of Taiwan and No. 10 Pusarly V Sindhu of India.
The event at Impact Muang Thong Arena ends on Sunday, with mixed doubles pair Dechapol Puavaranukroh and Sapsiree Taerattanachai aiming to make a clean sweep of three titles.
Dechapol and Sapsiree, ranked third, won the Yonex Thailand Open on Jan 17 and Toyota Thailand Open the following Sunday.