What is the relationship between Zheng Yutong and Yu Delu?

Competitive relationship. Zheng Yubo, formerly known as Zheng Tianyao, was nicknamed "Bauer". I became attached to billiards in 2007 and started a brilliant and challenging career in 2009. Yu Delu, male,19871June1Shaanxi native, is a player of China men's table tennis team. 1998 started practicing and became a professional athlete in 2005. Zheng Yubo and Yu Delu are playing. Billiards, also known as billiards or billiards, is one of the ball games. It is a sports and leisure project in which athletes use clubs with a length of more than 9 1.4 cm to hit the main ball and the target ball according to certain rules.