Tennis Ball Machines

Looking for a baseball book about a boy who becomes a good batter, learning with a broken tennis ball machine.
I don’t remember much about this book, but it involves a young boy living in the city I think. With a single mom, and he somehow finds this broken tennis ball machine and uses it to help him with batting pracice. He gets really good, and I think makes it to the big leagues. I’d really like to find it so I could read it again. Thanks for any info anyone has.
should be a good book, where did you heard of it?
