Fever BaseballFor collectors and stat nerdsFuture Value Radar (FVR) · On the record
Blue Notes · Umpire Grade2026-08-10

KC @ LAD

Home plate: John Bacon

The strike zone picked a side, and wasn't shy about it.

B-
Umpire Grade
91.9% accurate
1.3
Run Favor
runs, KC
1
ABS Overturns
of 4 reviewed

What this shows — how John Bacon called the 148 pitches that were taken (no swing), graded against the tracked rulebook strike zone. He got 136 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: Andy Pages — the ump called it a strike, the robot ruled strike (upheld — ump confirmed).1Challenge 2: Miguel Rojas — the ump called it a strike, the robot ruled strike (upheld — ump confirmed).2Challenge 3: Bobby Witt Jr. — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).3Challenge 4: Salvador Perez — the ump called it a ball, the robot ruled ball (upheld — ump confirmed).4
strike called ballball called strikeABS overturnedABS upheld

The calls that moved the game

  1. 1-0.697 · 3-2 ball called strike
    Andy Pages vs Alex Lange
  2. 2+0.283 · 1-2 strike called ball
    Kyle Isbel vs Tarik Skubal
  3. 3+0.208 · 2-1 strike called ball
    Carter Jensen vs Tanner Scott

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

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

  1. 1Andy Pages — ump said strike, robot ruled strike: upheld.
  2. 2Miguel Rojas — ump said strike, robot ruled strike: upheld.
  3. 3Bobby Witt Jr. — ump said ball, robot ruled strike: overturned.
  4. 4Salvador Perez — ump said ball, robot ruled ball: upheld.

Our tracked-rulebook zone matched the ABS ruling on 3 of 4 — a zone-definition gap (ABS grades a standardized, height-based zone), not our error.

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