What is the main theme in "Batting Against Castro" ?

I would hesitate to pick out one main theme without having
the chance to ask the author, but one of the main themes is the quest for the
middle-aged baseball player to find his career again.  To find the spark that will
revive a very much on the downward slope career in baseball that has led him to a
three-team league in pre-revolutionary Cuba.  The duel between the player and Castro in
the end is a rather improbable way of resolving such a conflict, but it serves to
highlight perhaps the impossibility of this quest in the first
place.