Video PlayerClose

China's Lu Guangzu serves during the men's singles first round match against Germany's Kai Schaefer at the BWF World Championships 2019 in Basel, Switzerland, Aug. 19, 2019. (Xinhua/Li Jundong)

China's Lu Guangzu serves during the men's singles first round match against Germany's Kai Schaefer at the BWF World Championships 2019 in Basel, Switzerland, Aug. 19, 2019. (Xinhua/Li Jundong)