Tai Tzu Ying of Chinese Taipei reacts during the women's singles 2nd round match against Fitriani Fitriani of Indonesia at the BWF World Championships 2019 in Basel, Switzerland, Aug. 21, 2019. (Photos: Xinhua)

Tai Tzu Ying of Chinese Taipei reacts during the women's singles 2nd round match against Fitriani Fitriani of Indonesia at the BWF World Championships 2019 in Basel, Switzerland, Aug. 21, 2019.

Fitriani Fitriani of Indonesia celebrates during the women's singles 2nd round match against Tai Tzu Ying of Chinese Taipei at the BWF World Championships 2019 in Basel, Switzerland, Aug. 21, 2019.

Tai Tzu Ying of Chinese Taipei returns the shuttle during the women's singles 2nd round match against Fitriani Fitriani of Indonesia at the BWF World Championships 2019 in Basel, Switzerland, Aug. 21, 2019.

Tai Tzu Ying of Chinese Taipei serves during the women's singles 2nd round match against Fitriani Fitriani of Indonesia at the BWF World Championships 2019 in Basel, Switzerland, Aug. 21, 2019.

Fitriani Fitriani of Indonesia returns the shuttle during the women's singles 2nd round match against Tai Tzu Ying of Chinese Taipei at the BWF World Championships 2019 in Basel, Switzerland, Aug. 21, 2019.

Robin Tabeling (R)/Selena Piek of the Netherlands compete during the mixed doubles 2nd round match against He Jiting/Du Yue of China at the BWF World Championships 2019 in Basel, Switzerland, Aug. 21, 2019.

Robin Tabeling (R)/Selena Piek of the Netherlands celebrate after the mixed doubles 2nd round match against He Jiting/Du Yue of China at the BWF World Championships 2019 in Basel, Switzerland, Aug. 21, 2019.

He Jiting (R)/Du Yue of China compete during the mixed doubles 2nd round match against Robin Tabeling/Selena Piek of the Netherlands at the BWF World Championships 2019 in Basel, Switzerland, Aug. 21, 2019.

Tai Tzu Ying of Chinese Taipei returns the shuttle during the women's singles 2nd round match against Fitriani Fitriani of Indonesia at the BWF World Championships 2019 in Basel, Switzerland, Aug. 21, 2019.

Robin Tabeling (R)/Selena Piek of the Netherlands celebrate after the mixed doubles 2nd round match against He Jiting/Du Yue of China at the BWF World Championships 2019 in Basel, Switzerland, Aug. 21, 2019.

He Jiting (L)/Du Yue of China compete during the mixed doubles 2nd round match against Robin Tabeling/Selena Piek of the Netherlands at the BWF World Championships 2019 in Basel, Switzerland, Aug. 21, 2019.

Robin Tabeling (R)/Selena Piek of the Netherlands celebrate after the mixed doubles 2nd round match against He Jiting/Du Yue of China at the BWF World Championships 2019 in Basel, Switzerland, Aug. 21, 2019.

He Jiting/Du Yue (Front) of China compete during the mixed doubles 2nd round match against Robin Tabeling/Selena Piek of the Netherlands at the BWF World Championships 2019 in Basel, Switzerland, Aug. 21, 2019.

China's Chen Qingchen (L)/Jia Yifan compete during the women's doubles 2nd round match against Thailand's Puttita Supajirakul/Sapsiree Taerattanachai at the BWF World Championships 2019 in Basel, Switzerland, Aug. 20, 2019.

China's Chen Qingchen/Jia Yifan (R) celebrate during the women's doubles 2nd round match against Thailand's Puttita Supajirakul/Sapsiree Taerattanachai at the BWF World Championships 2019 in Basel, Switzerland, Aug. 20, 2019.

China's Chen Qingchen/Jia Yifan (L) compete during the women's doubles 2nd round match against Thailand's Puttita Supajirakul/Sapsiree Taerattanachai at the BWF World Championships 2019 in Basel, Switzerland, Aug. 20, 2019.

China's Chen Qingchen/Jia Yifan (L) compete during the women's doubles 2nd round match against Thailand's Puttita Supajirakul/Sapsiree Taerattanachai at the BWF World Championships 2019 in Basel, Switzerland, Aug. 20, 2019.

China's Chen Qingchen/Jia Yifan (R) compete during the women's doubles 2nd round match against Thailand's Puttita Supajirakul/Sapsiree Taerattanachai at the BWF World Championships 2019 in Basel, Switzerland, Aug. 20, 2019.

China's Chen Qingchen (R)/Jia Yifan celebrate during the women's doubles 2nd round match against Thailand's Puttita Supajirakul/Sapsiree Taerattanachai at the BWF World Championships 2019 in Basel, Switzerland, Aug. 20, 2019.

China's Chen Qingchen (R)/Jia Yifan compete during the women's doubles 2nd round match against Thailand's Puttita Supajirakul/Sapsiree Taerattanachai at the BWF World Championships 2019 in Basel, Switzerland, Aug. 20, 2019.

China's Chen Qingchen (R)/Jia Yifan celebrate during the women's doubles 2nd round match against Thailand's Puttita Supajirakul/Sapsiree Taerattanachai at the BWF World Championships 2019 in Basel, Switzerland, Aug. 20, 2019.