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I agree that OOZ can be an indicator that a player is playing out of position, or at least paint a skewed picture of a player's defense. Chase Utley racked up the out of zone plays last season, but that was mostly because he was shading over towards 1B to help out Ryan Howard. Of course, Utley is a good defender anyway, so last year he was able to play on the edge of his 'zone' and still cover most of the ground he was expected to. A truly good defender would have great range numbers as well as the out of zone plays, like Utley. Also Franklin Gutierrez, who lead MLB CFs in RZR as well as OOZ.