Ashita no Joe 2 (Movie), Hajime no Ippo: Boxer no Kobushi Recommendations
Both are sports anime that focus on boxing. Also, the main characters, Joe and Takamura, are quite similar. They are both brash and strong delinquents, with a natural talent for boxing. Both are discovered by an old boxing coach. Both anime show these main characters go from street urchins to great boxers.