Blue Notes · Umpire Grade2026-04-26
“The zone leaned, and the ledger noticed.”
Umpire Grade
92.0% accurate
Run Favor
runs, BOS
ABS Overturns
of 3 reviewed
What this shows — how Alex Tosi called the 138 pitches that were taken (no swing), graded against the tracked rulebook strike zone. He got 127 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+0.69▲1 · 3-2 strike called ball
Roman Anthony vs Kyle Bradish - 2+0.13▲3 · 1-0 strike called ball
Connor Wong vs Kyle Bradish - 3-0.13▲6 · 1-0 ball called strike
Caleb Durbin vs Yennier Cano
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 · 0 overturned (ump overruled) · 3 upheld (ump confirmed). This is Hawkeye ground truth, no model involved.
- 1Willson Contreras — ump said strike, robot ruled strike: upheld.
- 2Willson Contreras — ump said strike, robot ruled strike: upheld.
- 3Taylor Ward — ump said strike, robot ruled strike: upheld.
Our tracked-rulebook zone matched the ABS ruling on 3 of 3 — a zone-definition gap (ABS grades a standardized, height-based zone), not our error.