Which 50 of the new tennis princes are participating in the U17 representative selection training? The new tennis prince is a Japanese manga and animation about the challenges and challenges that the protagonist, Ryuuma Echizen, experienced in the process of becoming a professional player. In this work, the U17 representative selection training was a challenge that Ryuuma Echizen had to face before becoming a professional player. He had to pass the selection to enter the professional player club. The number of participants in the U17 representative selection training was uncertain, but according to the plot description, there should be about 50 people.