Chen Long of China competes during the men's singles second round match against Lee Cheuk Yiu of China's Hong Kong at the BWF World Championships 2019 in Basel, Switzerland, Aug. 21, 2019. (Xinhua/Li Jundong)

Lee Cheuk Yiu of China's Hong Kong reacts during the men's singles second round match against Chen Long of China at the BWF World Championships 2019 in Basel, Switzerland, Aug. 21, 2019. (Xinhua/Li Jundong)

Chen Long of China competes during the men's singles second round match against Lee Cheuk Yiu of China's Hong Kong at the BWF World Championships 2019 in Basel, Switzerland, Aug. 21, 2019. (Xinhua/Li Jundong)

Chen Long of China reacts after the men's singles second round match against Lee Cheuk Yiu of China's Hong Kong at the BWF World Championships 2019 in Basel, Switzerland, Aug. 21, 2019. (Xinhua/Li Jundong)

Chen Long of China greets the audiences after the men's singles second round match against Lee Cheuk Yiu of China's Hong Kong at the BWF World Championships 2019 in Basel, Switzerland, Aug. 21, 2019. (Xinhua/Li Jundong)

Lee Cheuk Yiu of China's Hong Kong competes during the men's singles second round match against Chen Long of China at the BWF World Championships 2019 in Basel, Switzerland, Aug. 21, 2019. (Xinhua/Li Jundong)

Chen Long of China competes during the men's singles second round match against Lee Cheuk Yiu of China's Hong Kong at the BWF World Championships 2019 in Basel, Switzerland, Aug. 21, 2019. (Xinhua/Li Jundong)

Chen Long (L) of China shakes hands with Lee Cheuk Yiu of China's Hong Kong after their men's singles second round match at the BWF World Championships 2019 in Basel, Switzerland, Aug. 21, 2019. (Xinhua/Li Jundong)

Chen Long of China competes during the men's singles second round match against Lee Cheuk Yiu of China's Hong Kong at the BWF World Championships 2019 in Basel, Switzerland, Aug. 21, 2019. (Xinhua/Li Jundong)

Lee Cheuk Yiu of China's Hong Kong competes during the men's singles second round match against Chen Long of China at the BWF World Championships 2019 in Basel, Switzerland, Aug. 21, 2019. (Xinhua/Li Jundong)

Chen Long of China competes during the men's singles second round match against Lee Cheuk Yiu of China's Hong Kong at the BWF World Championships 2019 in Basel, Switzerland, Aug. 21, 2019. (Xinhua/Li Jundong)

Chen Long of China competes during the men's singles second round match against Lee Cheuk Yiu of China's Hong Kong at the BWF World Championships 2019 in Basel, Switzerland, Aug. 21, 2019. (Xinhua/Li Jundong)