The reason is that the referee decided that the racket used by Zhou Yu was not caused by accident.

What happened at that time was this: Zhou Yu was in the game in Chuan Chih Yuan. During the fifth game, he accidentally tore the rubber while checking his racket. Therefore, he asked the referee to change the racket, but the referee on duty thought that Zhou Yu had deliberately torn the rubber, not unintentionally caused the rubber to open. Therefore, the referee ruled that Zhou Yu's behavior was illegal and cancelled Zhou Yu's competition results and qualifications.

No athlete will want to enable the backup board when the main board is fine. After all, the performance and familiarity of the backup board are often not as good as that of the main board. It has always been more difficult for the public to win/play a good game with the backup board. In theory, it is the same sponge rubber configuration at most. There is no need to win the game if you change it.

However, some netizens said: The racket was cracked. After watching the game, Zhou Yu tore it himself, so he was disqualified. Fortunately, this is only an open competition. If it is a world competition, it will have a great impact! But I still don't understand why Zhou Yu didn't finish the game with his equipment.