The Benchwarmers (2006) on Netflix

When the owner of a minor landscaping service company, Gus, sees Nelson being abused by a group of baseball players, he defends the boy. The paperboy, Clark, tells them that his friend Richie and he have never played baseball so Gus invites them to play in the late afternoon. However, they are challenged by the bullies and they defeat the guys. The millionaire father of Nelson, Mel, invites Gus, Clark and Richie to form a team called The Benchwarmers and they become the sensation of the league, with a legion of outcast cheering for the team. However, when Gus' behavior during his childhood is discovered, the team and fans are affected.