Game theory [interactive decision theory] is mainly used in economics, political science, and psychology, as well as logic and biology.
I believe that I know that tennis serving and football penalty shooting more-or-less stick to their game-theoretical solutions. But are there sports that explicitly use game-theoretical analysis? (Or, perhaps easier to answer, are there game theorists employed or consulted by certain teams or individual players?)
NB: I am particularly interested in play or race strategy, not in acquisition strategy. (Moneyball, besides being statistical, not game-theoretical, isn't relevant to my question.)