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Blue Notes · Umpire Grade2026-05-03

HOU @ BOS

Home plate: Laz Diaz

“This one went to video review more than most.”

D
Umpire Grade
88.4% accurate
0.3
Run Favor
runs, HOU
6
ABS Overturns
of 9 reviewed

What this shows — how Laz Diaz called the 181 pitches that were taken (no swing), graded against the tracked rulebook strike zone. He got 160 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: Carlos Correa — the ump called it a strike, the robot ruled ball (OVERTURNED — ump overruled).1Challenge 2: Christian Walker — the ump called it a strike, the robot ruled ball (OVERTURNED — ump overruled).2Challenge 3: Cam Smith — the ump called it a strike, the robot ruled ball (OVERTURNED — ump overruled).3Challenge 4: Ceddanne Rafaela — the ump called it a strike, the robot ruled strike (upheld — ump confirmed).4Challenge 5: Carlos Narváez — the ump called it a ball, the robot ruled strike (OVERTURNED — ump overruled).5Challenge 6: Brice Matthews — the ump called it a strike, the robot ruled strike (upheld — ump confirmed).6Challenge 7: Cam Smith — the ump called it a strike, the robot ruled ball (OVERTURNED — ump overruled).7Challenge 8: Carlos Narváez — the ump called it a ball, the robot ruled ball (upheld — ump confirmed).8Challenge 9: Cam Smith — the ump called it a strike, the robot ruled ball (OVERTURNED — ump overruled).9
strike called ballball called strikeABS overturnedABS upheld

The calls that moved the game

  1. 1-0.69▼2 · 3-2 ball called strike
    Marcelo Mayer vs Cody Bolton
  2. 2-0.30▲4 · 3-1 ball called strike· challenged ✓
    Christian Walker vs Ranger Suarez
  3. 3-0.28▲3 · 1-2 ball called strike· challenged ✓
    Carlos Correa vs Ranger Suarez

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

9 pitches went to the robots · 6 overturned (ump overruled) · 3 upheld (ump confirmed). This is the ABS system’s own measurement — Hawk-Eye optical ball-tracking, not our model.

  1. 1Carlos Correa — ump said strike, robot ruled ball: overturned.
  2. 2Christian Walker — ump said strike, robot ruled ball: overturned.
  3. 3Cam Smith — ump said strike, robot ruled ball: overturned.
  4. 4Ceddanne Rafaela — ump said strike, robot ruled strike: upheld.
  5. 5Carlos Narváez — ump said ball, robot ruled strike: overturned.
  6. 6Brice Matthews — ump said strike, robot ruled strike: upheld.
  7. 7Cam Smith — ump said strike, robot ruled ball: overturned.
  8. 8Carlos Narváez — ump said ball, robot ruled ball: upheld.
  9. 9Cam Smith — ump said strike, robot ruled ball: overturned.

Our tracked-rulebook zone matched the ABS ruling on 8 of 9 — a zone-definition gap (ABS grades a standardized, height-based zone), not our error.

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