XVAL represents the amount of
excess value produced by a player. It is not simply the value the player has produced, but it is the value they have produced
above & beyond (or in some cases below) what they have been paid. It is derived from calculating the total value produced by a player (
WAR * Win Value) then subtracting the amount of salary the player has been paid through that given point in the season. For a more detailed definition visit our blog post:
What is XVAL?