A Productive Out, as defined and developed by ESPN The Magazine and the Elias Sports Bureau: when a fly ball, grounder or bunt advances a runner with nobody out; when a pitcher bunts to advance a runner with one out (maximizing the effectiveness of the pitcher's at-bat), or when a grounder or fly ball scores a run with one out.

PO - Productive Outs, OPP - al Outs in potential Productive Out situations, PO% - Productive Out Percent, Minimum - 30 opportunities to qualify.