Blue Notes · Umpire Grade2026-03-30
BOS @ HOU
Home plate: Nate Tomlinson
“Nothing that'll trend, and on this beat that's a compliment.”
Umpire Grade
95.1% accurate
Run Favor
runs, HOU
ABS Overturns
of 3 reviewed
What this shows — how Nate Tomlinson called the 143 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
strike called ballball called strikeABS overturnedABS upheld
The calls that moved the game
- 1+0.23▼4 · 0-2 strike called ball· challenged
Yainer Diaz vs Ranger Suarez - 2-0.20▼8 · 2-1 ball called strike
Brice Matthews vs Johan Oviedo - 3+0.13▼2 · 1-0 strike called ball
Yainer Diaz 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
3 pitches went to the robots · 1 overturned (ump overruled) · 2 upheld (ump confirmed). This is Hawkeye ground truth, no model involved.
- 1Jose Altuve — ump said ball, robot ruled strike: overturned.
- 2Carlos Narváez — ump said ball, robot ruled ball: upheld.
- 3Yainer Diaz — ump said ball, robot ruled ball: upheld.
Our tracked-rulebook zone matched the ABS ruling on 1 of 3 — a zone-definition gap (ABS grades a standardized, height-based zone), not our error.