Blue Notes · Umpire Grade2026-04-11
SF @ BAL
Home plate: Brian O'Nora
“Called a fair game and let the players decide it.”
Umpire Grade
91.5% accurate
Run Favor
runs, SF
ABS Overturns
of 4 reviewed
What this shows — how Brian O'Nora called the 142 pitches that were taken (no swing), graded against the tracked rulebook strike zone. He got 130 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
- 1-0.39▼6 · 2-2 ball called strike
Dylan Beavers vs Logan Webb - 2+0.23▼6 · 0-2 strike called ball
Leody Taveras vs Logan Webb - 3+0.13▼1 · 1-1 strike called ball
Samuel Basallo vs Logan Webb
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 Hawkeye ground truth, no model involved.
- 1Chris Bassitt — ump said strike, robot ruled ball: overturned.
- 2Willy Adames — ump said ball, robot ruled strike: overturned.
- 3Willy Adames — ump said strike, robot ruled strike: upheld.
- 4Samuel Basallo — 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), not our error.