Eyeshield 21, Dogashi Kaden Recommendations
Both about runners who didn't know they had it in them. Though Sena works hard for the sport later into the series and Ookada works hard for Basketball right off the start. Dogashi Kaden's a very exciting quick read. Too bad the series doesn't go further.
Similarities: Both have main characters who are timid but wants to change. Both are discovered for their hidden talent. The talent, being speed.
Difference: Eyeshield21 has 333 chapters. Dogashi Kaden has 13 chapters only. Instead of American Football, the sports is basketball.