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Expected wins added over an average pitcher. WX uses win expectancy calculations to assess how relievers have changed the outcome of games. Win expectancy looks at the inning, score, and runners on base when the reliever entered the game, and determines the probability of the team winning the game from that point with an average pitcher. Then it looks at how the reliever actually did, and how that changes the probability of winning. The difference between how the reliever improved the chances of winning and how an average pitcher would is his WX.

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