From BR Bullpen
- the National High School Baseball Championship, or "summer Koshien," which has been held since 1915.
- the National High School Baseball Invitational Tournament, or "spring Koshien," which has been held since 1924.
Summer Koshien is a nationwide tournament to determine the top high-school team in Japan, while Spring Koshien pits the best high school teams against each other. Both tournaments predate Japan's pro leagues by over a decade and attracts more attention than any Nippon Pro Baseball event other than the Japan Series. Many players have first achieved their fame nationally in these tournaments. Among the more recent players are former Yomiuri Giant Hideki Matsui and Seibu Lions pitcher Daisuke Matsuzaka.