Lawrence Block has been reissuing some of his earlier work as Kindle shorts. If you have read much Block, be careful not to purchase something that might have appeared earlier in one of the books. The Keller "novels" for example are often more collections of stories that lend themselves to appearing independently.
That being said, I had not read this one before, which had appeared in a magazine several decades ago. It is typical Keller with him making adjustments to the hit he has been paid to complete, stamps, etc., all written in that wonderful Block style that makes his work so engaging. This one has a baseball theme.
Most of these can be gotten free through Kindle Unlimited. Read them.