Olympic athletes should be fully evaluated and tested before going out, and who is the main force and who is the substitute should be scientifically calculated. Of course, it is also possible that an old injury suddenly recurs during the game. Many athletes have been injured in high-intensity and high-intensity training and competitions, and even had surgery. Malone and Xu Xin both had old injuries, and Liu Ye had an operation. Xu Xin and Zuowei Liu, as partners, can reach the final in this Olympic Games, which is both strength and desperate.
However, the first medal of the table tennis team was lost to the Japanese team: Toshiichi Mizutani and Mikei Ito, which was a bit unexpected. Maybe everyone thinks the Wenxin team didn't play well. However, judging from the performance on the field, the Japanese combination has better competitive state and cooperation, and the new combination has moisture.
After the game, Shi Wen gave an explanation for retiring due to injury. I think Liu is under great pressure at this time, and no one can afford to lose, especially the national ball. Once psychologically frustrated, players will bring very uncertain factors to the follow-up competition. In view of this situation, both players and table tennis team leaders will consider it. Coupled with the performance on the court, as well as a deeper understanding of Japanese players' competitive tactics and play, it is possible to change teams and players on the spot.
Of course, all this is a personal guess. In any case, there is no doubt that all the players have contributed to and won glory for their country, which makes me admire.