Fever BaseballFor collectors and stat nerdsFuture Value Radar (FVR) · On the record
Blue Notes · Umpire Grade2026-08-21

SF @ BOS

Home plate: John Libka

A workmanlike night — nothing to frame, nothing to fix.

A
Umpire Grade
95.1% accurate
0.2
Run Favor
runs, BOS
3
ABS Overturns
of 5 reviewed

What this shows — how John Libka called the 163 pitches that were taken (no swing), graded against the tracked rulebook strike zone. He got 155 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: Sonny Gray — the ump called it a strike, the robot ruled ball (OVERTURNED — ump overruled).1Challenge 2: Adley Rutschman — the ump called it a strike, the robot ruled ball (OVERTURNED — ump overruled).2Challenge 3: Drew Gilbert — the ump called it a strike, the robot ruled strike (upheld — ump confirmed).3Challenge 4: Drew Cavanaugh — the ump called it a ball, the robot ruled ball (upheld — ump confirmed).4Challenge 5: Adley Rutschman — the ump called it a strike, the robot ruled ball (OVERTURNED — ump overruled).5
strike called ballball called strikeABS overturnedABS upheld

The calls that moved the game

  1. 1-0.237 · 0-2 ball called strike
    Willy Adames vs Erik Miller
  2. 2+0.213 · 3-0 strike called ball
    Rafael Devers vs Sonny Gray
  3. 3+0.132 · 1-1 strike called ball
    Turner Hill vs Sonny Gray

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

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

  1. 1Sonny Gray — ump said strike, robot ruled ball: overturned.
  2. 2Adley Rutschman — ump said strike, robot ruled ball: overturned.
  3. 3Drew Gilbert — ump said strike, robot ruled strike: upheld.
  4. 4Drew Cavanaugh — ump said ball, robot ruled ball: upheld.
  5. 5Adley Rutschman — ump said strike, robot ruled ball: overturned.

Our tracked-rulebook zone matched the ABS ruling on 2 of 5 — a zone-definition gap (ABS grades a standardized, height-based zone), not our error.

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