Xu Xin of China reacts during the men's single semifinal match against Ma Long of China at ITTF World Tour Platinum Qatar Open in the Qatari capital of Doha on March 30, 2019. Xu Xin lost 2-4. (Xinhua/Nikku)

Xu Xin of China hits a return during the men's single semifinal match against Ma Long of China at ITTF World Tour Platinum Qatar Open in the Qatari capital of Doha on March 30, 2019. Xu Xin lost 2-4. (Xinhua/Nikku)

Xu Xin of China hits a return during the men's single semifinal match against Ma Long of China at ITTF World Tour Platinum Qatar Open in the Qatari capital of Doha on March 30, 2019. Xu Xin lost 2-4. (Xinhua/Nikku)

Xu Xin of China serves during the men's single semifinal match against Ma Long of China at ITTF World Tour Platinum Qatar Open in the Qatari capital of Doha on March 30, 2019. Xu Xin lost 2-4. (Xinhua/Nikku)

Xu Xin of China reacts during the men's single semifinal match against Ma Long of China at ITTF World Tour Platinum Qatar Open in the Qatari capital of Doha on March 30, 2019. Xu Xin lost 2-4. (Xinhua/Nikku)

Ma Long of China hits a return during the men's single semifinal match against Xu Xin of China at ITTF World Tour Platinum Qatar Open in the Qatari capital of Doha on March 30, 2019. Ma Long won 4-2. (Xinhua/Nikku)

Xu Xin of China hits a return during the men's single semifinal match against Ma Long of China at ITTF World Tour Platinum Qatar Open in the Qatari capital of Doha on March 30, 2019. Xu Xin lost 2-4. (Xinhua/Nikku)

Ma Long of China hits a return during the men's single semifinal match against Xu Xin of China at ITTF World Tour Platinum Qatar Open in the Qatari capital of Doha on March 30, 2019. Ma Long won 4-2. (Xinhua/Nikku)

Ma Long of China reacts during the men's single semifinal match against Xu Xin of China at ITTF World Tour Platinum Qatar Open in the Qatari capital of Doha on March 30, 2019. Ma Long won 4-2. (Xinhua/Nikku)

Ma Long of China serves during the men's single semifinal match against Xu Xin of China at ITTF World Tour Platinum Qatar Open in the Qatari capital of Doha on March 30, 2019. Ma Long won 4-2. (Xinhua/Nikku)

Ma Long of China hits a return during the men's single semifinal match against Xu Xin of China at ITTF World Tour Platinum Qatar Open in the Qatari capital of Doha on March 30, 2019. Ma Long won 4-2. (Xinhua/Nikku)

Ma Long of China hits a return during the men's single semifinal match against Xu Xin of China at ITTF World Tour Platinum Qatar Open in the Qatari capital of Doha on March 30, 2019. Ma Long won 4-2. (Xinhua/Nikku)

Mattias Falck of Sweden serves during the men's single semifinal match against Lin Gaoyuan of China at ITTF World Tour Platinum Qatar Open in the Qatari capital of Doha on March 30, 2019. Mattias Falck lost 3-4. (Xinhua/Nikku)

Lin Gaoyuan of China serves during the men's single semifinal match against Mattias Falck of Sweden at ITTF World Tour Platinum Qatar Open in the Qatari capital of Doha on March 30, 2019. Lin Gaoyuan won 4-3. (Xinhua/Nikku)

Mattias Falck of Sweden hits a return during the men's single semifinal match against Lin Gaoyuan of China at ITTF World Tour Platinum Qatar Open in the Qatari capital of Doha on March 30, 2019. Mattias Falck lost 3-4. (Xinhua/Nikku)

Lin Gaoyuan of China hits a return during the men's single semifinal match against Mattias Falck of Sweden at ITTF World Tour Platinum Qatar Open in the Qatari capital of Doha on March 30, 2019. Lin Gaoyuan won 4-3. (Xinhua/Nikku)

Mattias Falck of Sweden serves during the men's single semifinal match against Lin Gaoyuan of China at ITTF World Tour Platinum Qatar Open in the Qatari capital of Doha on March 30, 2019. Mattias Falck lost 3-4. (Xinhua/Nikku)

Lin Gaoyuan of China hits a return during the men's single semifinal match against Mattias Falck of Sweden at ITTF World Tour Platinum Qatar Open in the Qatari capital of Doha on March 30, 2019. Lin Gaoyuan won 4-3. (Xinhua/Nikku)

Lin Gaoyuan of China reacts during the men's single semifinal match against Mattias Falck of Sweden at ITTF World Tour Platinum Qatar Open in the Qatari capital of Doha on March 30, 2019. Lin Gaoyuan won 4-3. (Xinhua/Nikku)

Mattias Falck of Sweden hits a return during the men's single semifinal match against Lin Gaoyuan of China at ITTF World Tour Platinum Qatar Open in the Qatari capital of Doha on March 30, 2019. Mattias Falck lost 3-4. (Xinhua/Nikku)

Lin Gaoyuan (R) of China listens to his coach Liu Guozheng during the men's single semifinal match against Mattias Falck of Sweden at ITTF World Tour Platinum Qatar Open in the Qatari capital of Doha on March 30, 2019. Lin Gaoyuan won 4-3. (Xinhua/Nikku)

Lin Gaoyuan of China hits a return during the men's single semifinal match against Mattias Falck of Sweden at ITTF World Tour Platinum Qatar Open in the Qatari capital of Doha on March 30, 2019. Lin Gaoyuan won 4-3. (Xinhua/Nikku)

Lin Gaoyuan of China reacts during the men's single semifinal match against Mattias Falck of Sweden at ITTF World Tour Platinum Qatar Open in the Qatari capital of Doha on March 30, 2019. Lin Gaoyuan won 4-3. (Xinhua/Nikku)

Lin Gaoyuan of China reacts during the men's single semifinal match against Mattias Falck of Sweden at ITTF World Tour Platinum Qatar Open in the Qatari capital of Doha on March 30, 2019. Lin Gaoyuan won 4-3. (Xinhua/Nikku)

Lin Gaoyuan of China hits a return during the men's single semifinal match against Mattias Falck of Sweden at ITTF World Tour Platinum Qatar Open in the Qatari capital of Doha on March 30, 2019. Lin Gaoyuan won 4-3. (Xinhua/Nikku)