Manga H2

Hiro has two loves: baseball and porn. But due to an elbow injury he gives up baseball choosing a school with no baseball team. His childhood friend Hikari attends a different school with baseball ace Hideo and the two wish Hiro had not given up baseball. Hiro joins the soccer team but meets Haruka, a very clumsy girl, who is manager of the unofficial baseball club. When the soccer team challenges the baseball club to a game, with hopes of humiliating them, the baseball club nearly loses until Hiro, disgusted by the soccer team`s arrogance, switches to the baseball club.
A not-to-be-missed series for all, and you don't need to be a baseball fan to enjoy this!
From AnimeNfo:
Kunimi Hiro and his best friend Hideo were baseball wonders... Until Hiro found out his arm was permanently damaged, rendering him unable to play anymore. A frustrated Hiro goes through the trouble of specifically finding a high school with no baseball team... Only to later on find out the doctor who examined him was a quack and his arm is perfectly fine. Hiro is quick to reinstate his dream: Creating a baseball team for his school and getting to face off against Hideo in the Koshien... The number one premier league for high school baseball.