Sayaka Takahashi (L) of Japan hits a return during the women's singles semifinal match between Sayaka Takahashi of Japan and Carolina Marin of Spain at China Open 2019 badminton tournament in Changzhou, east China's Jiangsu Province, Sept. 21, 2019. (Xinhua/Yang Lei)

Carolina Marin of Spain celebrates during the women's singles semifinal match between Sayaka Takahashi of Japan and Carolina Marin of Spain at China Open 2019 badminton tournament in Changzhou, east China's Jiangsu Province, Sept. 21, 2019. (Xinhua/Yang Lei)

Sayaka Takahashi (L) of Japan hits a return during the women's singles semifinal match between Sayaka Takahashi of Japan and Carolina Marin of Spain at China Open 2019 badminton tournament in Changzhou, east China's Jiangsu Province, Sept. 21, 2019. (Xinhua/Yang Lei)

Carolina Marin of Spain hits a return during the women's singles semifinal match between Sayaka Takahashi of Japan and Carolina Marin of Spain at China Open 2019 badminton tournament in Changzhou, east China's Jiangsu Province, Sept. 21, 2019. (Xinhua/Yang Lei)

Carolina Marin of Spain hits a return during the women's singles semifinal match between Sayaka Takahashi of Japan and Carolina Marin of Spain at China Open 2019 badminton tournament in Changzhou, east China's Jiangsu Province, Sept. 21, 2019. (Xinhua/Yang Lei)

Carolina Marin of Spain hits a return during the women's singles semifinal match between Sayaka Takahashi of Japan and Carolina Marin of Spain at China Open 2019 badminton tournament in Changzhou, east China's Jiangsu Province, Sept. 21, 2019. (Xinhua/Yang Lei)

Carolina Marin of Spain hits a return during the women's singles semifinal match between Sayaka Takahashi of Japan and Carolina Marin of Spain at China Open 2019 badminton tournament in Changzhou, east China's Jiangsu Province, Sept. 21, 2019. (Xinhua/Yang Lei)

Carolina Marin of Spain hits a return during the women's singles semifinal match between Sayaka Takahashi of Japan and Carolina Marin of Spain at China Open 2019 badminton tournament in Changzhou, east China's Jiangsu Province, Sept. 21, 2019. (Xinhua/Yang Lei)

Huang Yaqiong (R)/Zheng Siwei of China competes during the mixed doubles semifinal match between Huang Yaqiong/Zheng Siwei of China and Seo Seung Jae/Chae Yu Jung of South Korea at China Open 2019 badminton tournament in Changzhou, east China's Jiangsu Province, Sept. 21, 2019. (Xinhua/Yang Lei)

Seo Seung Jae (L)/Chae Yu Jung of South Korea competes during the mixed doubles semifinal match between Huang Yaqiong/Zheng Siwei of China and Seo Seung Jae/Chae Yu Jung of South Korea at China Open 2019 badminton tournament in Changzhou, east China's Jiangsu Province, Sept. 21, 2019. (Xinhua/Yang Lei)

Huang Yaqiong (front)/Zheng Siwei of China competes during the mixed doubles semifinal match between Huang Yaqiong/Zheng Siwei of China and Seo Seung Jae/Chae Yu Jung of South Korea at China Open 2019 badminton tournament in Changzhou, east China's Jiangsu Province, Sept. 21, 2019. (Xinhua/Yang Lei)

Seo Seung Jae (L)/Chae Yu Jung of South Korea competes during the mixed doubles semifinal match between Huang Yaqiong/Zheng Siwei of China and Seo Seung Jae/Chae Yu Jung of South Korea at China Open 2019 badminton tournament in Changzhou, east China's Jiangsu Province, Sept. 21, 2019. (Xinhua/Yang Lei)

Huang Yaqiong (L)/Zheng Siwei of China competes during the mixed doubles semifinal match between Huang Yaqiong/Zheng Siwei of China and Seo Seung Jae/Chae Yu Jung of South Korea at China Open 2019 badminton tournament in Changzhou, east China's Jiangsu Province, Sept. 21, 2019. (Xinhua/Yang Lei)

Seo Seung Jae (front)/Chae Yu Jung of South Korea competes during the mixed doubles semifinal match between Huang Yaqiong/Zheng Siwei of China and Seo Seung Jae/Chae Yu Jung of South Korea at China Open 2019 badminton tournament in Changzhou, east China's Jiangsu Province, Sept. 21, 2019. (Xinhua/Yang Lei)

Seo Seung Jae/Chae Yu Jung (front) of South Korea competes during the mixed doubles semifinal match between Huang Yaqiong/Zheng Siwei of China and Seo Seung Jae/Chae Yu Jung of South Korea at China Open 2019 badminton tournament in Changzhou, east China's Jiangsu Province, Sept. 21, 2019. (Xinhua/Yang Lei)

Huang Yaqiong (front)/Zheng Siwei of China competes during the mixed doubles semifinal match between Huang Yaqiong/Zheng Siwei of China and Seo Seung Jae/Chae Yu Jung of South Korea at China Open 2019 badminton tournament in Changzhou, east China's Jiangsu Province, Sept. 21, 2019. (Xinhua/Yang Lei)

Huang Yaqiong (R)/Zheng Siwei of China competes during the mixed doubles semifinal match between Huang Yaqiong/Zheng Siwei of China and Seo Seung Jae/Chae Yu Jung of South Korea at China Open 2019 badminton tournament in Changzhou, east China's Jiangsu Province, Sept. 21, 2019. (Xinhua/Yang Lei)

Huang Yaqiong (R)/Zheng Siwei of China competes during the mixed doubles semifinal match between Huang Yaqiong/Zheng Siwei of China and Seo Seung Jae/Chae Yu Jung of South Korea at China Open 2019 badminton tournament in Changzhou, east China's Jiangsu Province, Sept. 21, 2019. (Xinhua/Yang Lei)

Sayaka Takahashi (L) of Japan celebrates during the women's singles semifinal match between Sayaka Takahashi of Japan and Carolina Marin of Spain at China Open 2019 badminton tournament in Changzhou, east China's Jiangsu Province, Sept. 21, 2019. (Xinhua/Yang Lei)