| Name | 関口勇哉 |
| Country | Japan |
| prefectures | tokyo |
| Racket | KORBEL |
| Rubber forehand | GLAYZER09C |
| Rubber backhand | TENERGY 19 |
| Occupation | Junior high school student |
Match result
-sponsor-
| Name | 関口勇哉 |
| Country | Japan |
| prefectures | tokyo |
| Racket | KORBEL |
| Rubber forehand | GLAYZER09C |
| Rubber backhand | TENERGY 19 |
| Occupation | Junior high school student |