If you liked the movie...
I love baseball and I have always enjoyed the movie. I had heard that the ending in the book was somewhat different, and with that in mind, I read the book (novelette) or long short story.
Without attempting to spoil the book, I'll just say that the entire tone of the book and the ending itself were less than upbeat. It caused me to read an entire anthology of stories by Malamud, and I found the tone to be similar in all of them.
Even after this, I still love the movie.