The Day I Hit a Home Run at Great American Ball Park by Paul Millen is a book about Cory and his love for baseball. In the beginning of the book Cory, a sixth grader, is trying out for C-Ball. Cory's dream is to hit a home run in the Great American Ball Park. Along the way Cory is both encouraged and criticized by his dad. The book shows how Cory's relationship with his perfectionist father grows. Cory learns to believe in himself.