Fever BaseballFor collectors and stat nerdsFuture Value Radar (FVR) · On the record
Blue Notes · Umpire Grade2026-04-23

NYY @ BOS

Home plate: John Libka

A steady night's work behind the plate.

A
Umpire Grade
96.2% accurate
0.5
Run Favor
runs, NYY
1
ABS Overturns
of 3 reviewed

What this shows — how John Libka called the 133 pitches that were taken (no swing), graded against the tracked rulebook strike zone. He got 128 right. Below, only his misses are plotted, alongside every pitch the ABS (Automated Ball-Strike System) reviewed on a challenge.

The zone, as he called it

Challenge 1: Austin Wells — the ump called it a ball, the robot ruled ball (upheld — ump confirmed).1Challenge 2: José Caballero — the ump called it a strike, the robot ruled strike (upheld — ump confirmed).2Challenge 3: Ryan Watson — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).3
strike called ballball called strikeABS overturnedABS upheld

The calls that moved the game

  1. 1+0.399 · 2-2 strike called ball· challenged
    Ben Rice vs Ryan Watson
  2. 2+0.235 · 0-2 strike called ball
    Austin Wells vs Payton Tolle
  3. 3-0.136 · 1-1 ball called strike
    Aaron Judge vs Payton Tolle

Run impact from the count run-value table: a missed strike three is worth far more than one on 3-0.

ABS — the Automated Ball-Strike System

3 pitches went to the robots · 1 overturned (ump overruled) · 2 upheld (ump confirmed). This is the ABS system’s own measurement — Hawk-Eye optical ball-tracking, not our model.

  1. 1Austin Wells — ump said ball, robot ruled ball: upheld.
  2. 2José Caballero — ump said strike, robot ruled strike: upheld.
  3. 3Ryan Watson — ump said ball, robot ruled strike: overturned.

Our tracked-rulebook zone matched the ABS ruling on 3 of 3 — a zone-definition gap (ABS grades a standardized, height-based zone), not our error.

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