TJ and The Sports Fanatic (Orca Young Readers)

Blurb

TJ Barnes is back, playing with his crazy cats, T-Rex and Alaska, helping out in his parents' hardware store and goofing around with his best friend, Seymour. When Seymour announces that he has signed them both up for a football team, TJ fears the worst. Neither of them is huge or mean or able to tackle, catch, throw, run or kick a ball down a field, but Seymour is determined to be a star. With the help of a stack of library books, TJ starts to understand the game but it takes more than a few books to figure out what’s wrong with his best friend.
TJ and the Sports Fanatic is the fourth of five books in a series.
Book one is TJ and the Cats.
Book two is TJ and the Haunted House.
Book three is TJ and the Rockets.
Book five is TJ and the Quiz Kids.