MLB Park Performance

Career regular-season Statcast, 2015–present. Each delta compares a hitter’s line at this specific park against the same hitter’s line at every other park over the same span — a within-player comparison on disjoint samples. It is not a park factor, and it is not a projection of tonight.

Rows are ranked only when the sample meets 25 PA at the park and 100 PA elsewhere. Smaller samples sit in a separate labelled section under “below-floor samples” and should be read as anecdote. Only hitters in the game’s confirmed lineup or on either club’s current roster appear; confirmed-lineup hitters lead the default order, and before lineups post the view covers both rosters.

PA here / elsew.

Plate appearances at this park, then at every other park. The denominator behind every other number in the row.

xwOBA Δ (raw)

xwOBA at this park minus xwOBA elsewhere. Shown as observed, undiscounted. On a thin sample this number is mostly noise.

Shrunk Δ

The same delta discounted for sample size, as delta × PA / (PA + 250), and the column the default order ranks on. Delta variance falls as 1/PA, so ranking on the raw number puts the weakest evidence on top of every board. 250 is measured from this substrate’s own variance, not chosen for roundness. Both numbers are shown so the size of the discount is visible rather than applied out of sight.

Park pctile

Where the raw delta falls among every hitter with a qualifying sample at this park, not just tonight’s. A +.045 reads very differently at a park whose median hitter is +.040 than at one whose median is −.015. The card header gives that park’s median and middle half.

xwOBA here / elsew.

The two levels the delta is taken between, so the delta can be checked.

HR/100 Δ

Home runs per 100 PA at this park minus the same rate elsewhere. Kept because it is a genuine here-versus-elsewhere comparison rather than a venue-only number.

Seasons

First and last season contributing to the sample at this park.

Sorting

Every column header sorts. Sorting ascending on a delta column surfaces hitters who are worse at a park — equally informative, and unreachable in the default order. A blank baseline (—) sorts last in both directions; it means no elsewhere sample, not zero.

Columns deliberately not shown: wOBA delta, which answers the same question as the xwOBA delta with roughly twice the per-PA sampling noise; and exit velocity, hard-hit rate and barrel rate, which the table carries only for this park with no elsewhere counterpart, leaving nothing to compare them against.