Livestream the 2023 tournament here! Official Name: 全国高等学校野球選手権大会 (Zenkoku Kōtō Gakkō Yakyū Senshuken Taikai) = National High School Baseball Championship Also Known As: Natsu no Koshien, Natsu no Kōkō Yakyu, Natsu no Senshuken Sponsored by: Asahi Newspaper and the Japan High School Baseball Federation Number of Participating Teams: 49 (54 in 2018 — the 100th tournament) Played...