Kanak Jha of the United States returns the ball during the men's singles Group B match against Lee Sangsu of South Korea at the 2019 ITTF Men's World Cup in Chengdu, southwest China's Sichuan Province, Nov. 29, 2019. (Xinhua/Liu Kun)

Quadri Aruna of Nigeria returns the ball during the men's singles Group C match against Kristian Karlsson of Sweden at the 2019 ITTF Men's World Cup in Chengdu, southwest China's Sichuan Province, Nov. 29, 2019. (Xinhua/Liu Kun)

Hu Heming of Australia returns the ball during the men's singles Group C match against Quari Aruna of Nigeria at the 2019 ITTF Men's World Cup in Chengdu, southwest China's Sichuan Province, Nov. 29, 2019. (Xinhua/Liu Kun)

Jonathan Groth of Denmark returns the ball during the men's singles Group D match against Simon Gauzy of France at the 2019 ITTF Men's World Cup in Chengdu, southwest China's Sichuan Province, Nov. 29, 2019. (Xinhua/Liu Kun)

Hu Heming of Australia serves during the men's singles Group C match against Quari Aruna of Nigeria at the 2019 ITTF Men's World Cup in Chengdu, southwest China's Sichuan Province, Nov. 29, 2019. (Xinhua/Liu Kun)

Lee Sangsu of South Korea returns the ball during the men's singles Group B match against Kanak Jha of the United States at the 2019 ITTF Men's World Cup in Chengdu, southwest China's Sichuan Province, Nov. 29, 2019. (Xinhua/Liu Kun)

Simon Gauzy of France returns the ball during the men's singles Group D match against Jonathan Groth of Denmark at the 2019 ITTF Men's World Cup in Chengdu, southwest China's Sichuan Province, Nov. 29, 2019. (Xinhua/Liu Kun)