Fever BaseballFor collectors and stat nerdsFuture Value Radar (FVR) · On the record
Blue Notes · Umpire Grade2026-09-09

HOU @ PHI

Home plate: Brock Ballou

“You wanted a strike, you had to earn it twice.”

B
Umpire Grade
92.9% accurate
0.7
Run Favor
runs, PHI
2
ABS Overturns
of 4 reviewed

What this shows — how Brock Ballou called the 154 pitches that were taken (no swing), graded against the tracked rulebook strike zone, or, on a pitch the ABS (Automated Ball-Strike System) reviewed on a challenge, against its ruling. 143 were right. Below, only the misses are plotted, alongside every challenged pitch.

The zone, as he called it

Challenge 1: Bryce Harper — the ump called it a strike, the robot ruled strike (upheld — ump confirmed). Our tracking puts it on the other side of the line; the grade follows the ruling.1*Challenge 2: J.T. Realmuto — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).2Challenge 3: Yainer Diaz — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).3Challenge 4: Yainer Diaz — the ump called it a ball, the robot ruled ball (upheld — ump confirmed).4
strike called ballball called strikeABS overturnedABS upheld

* Graded on the ABS ruling. ABS measures its own zone, set by the batter’s height and taken at the middle of the plate, and our tracking puts this pitch on the other side of the line.

The calls that moved the game

  1. 1+0.28▼2 · 1-2 strike called ball
    Luis Arraez vs Hunter Brown
  2. 2-0.20▼4 · 2-1 ball called strike
    J.T. Realmuto vs Hunter Brown
  3. 3+0.13▼1 · 1-1 strike called ball
    Bryce Harper vs Hunter Brown

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

  1. 1Bryce Harper — ump said strike, robot ruled strike: upheld.
  2. 2J.T. Realmuto — ump said ball, robot ruled strike: overturned.
  3. 3Yainer Diaz — ump said ball, robot ruled strike: overturned.
  4. 4Yainer Diaz — 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). Where the two disagree, the umpire is graded on the ABS ruling.

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