Bungo

In a town with no baseball team, young Bungo spends his days throwing the ball he received as a gift against a wall until Yukio Noda, Japanese representative youth baseball player, appears before him and an unexpected showdown ensues! After a chance meeting in middle school, these two enroll in Shizuo Senior where they struggle to make it to Koushien with everything they have.

(Source: Shueisha, translated)