Eyeshield 21, Baby Steps Recommendations
Baby Steps and Eyeshield 21 not only target the same demographic, but do so quite similarly. Both series revolve around a character with a latent potential to succeed in a sport. Although both characters do not readily involve themselves with their sports, they do grow fond of developing themselves and competing with others.
Central theme, plot, and the characters are all very similar.
Both protagonists are clumsy and a complete beginner in the sport. But they both have a special trait that let them shine and leave the crowd in awe. With each match, they grow gaining new friends and rivals along the way.