Kento Momota of Japan competes during the men's semifinal match against Chen Long of China at China Open 2019 badminton tournament in Changzhou, east China's Jiangsu Province, Sept. 21, 2019. (Xinhua/Yang Lei)

Kento Momota of Japan competes during the men's semifinal match against Chen Long of China at China Open 2019 badminton tournament in Changzhou, east China's Jiangsu Province, Sept. 21, 2019. (Xinhua/Yang Lei)

Chen Long of China competes during the men's semifinal match against Kento Momota of Japan at China Open 2019 badminton tournament in Changzhou, east China's Jiangsu Province, Sept. 21, 2019. (Xinhua/Yang Lei)

Chen Long of China competes during the men's semifinal match against Kento Momota of Japan at China Open 2019 badminton tournament in Changzhou, east China's Jiangsu Province, Sept. 21, 2019. (Xinhua/Yang Lei)

Chen Long of China competes during the men's semifinal match against Kento Momota of Japan at China Open 2019 badminton tournament in Changzhou, east China's Jiangsu Province, Sept. 21, 2019. (Xinhua/Yang Lei)

Kento Momota of Japan competes during the men's semifinal match against Chen Long of China at China Open 2019 badminton tournament in Changzhou, east China's Jiangsu Province, Sept. 21, 2019. (Xinhua/Yang Lei)

Chen Long of China competes during the men's semifinal match against Kento Momota of Japan at China Open 2019 badminton tournament in Changzhou, east China's Jiangsu Province, Sept. 21, 2019. (Xinhua/Yang Lei)