Blue Notes · Umpire Grade2026-05-01
SF @ TB
Home plate: John Bacon
“An honest evening's grade: nothing loud, nothing missed by much.”
Umpire Grade
94.6% accurate
Run Favor
runs, SF
ABS Overturns
of 6 reviewed
What this shows — how John Bacon called the 112 pitches that were taken (no swing), graded against the tracked rulebook strike zone. He got 106 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
- 1-0.20▼6 · 2-1 ball called strike
Junior Caminero vs Robbie Ray - 2+0.13▲7 · 1-1 strike called ball
Rafael Devers vs Ian Seymour - 3-0.13▼6 · 1-0 ball called strike
Ryan Vilade vs Robbie Ray
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
6 pitches went to the robots · 3 overturned (ump overruled) · 3 upheld (ump confirmed). This is Hawkeye ground truth, no model involved.
- 1Junior Caminero — ump said ball, robot ruled strike: overturned.
- 2Chandler Simpson — ump said strike, robot ruled strike: upheld.
- 3Willy Adames — ump said ball, robot ruled strike: overturned.
- 4Willy Adames — ump said strike, robot ruled strike: upheld.
- 5Nick Fortes — ump said ball, robot ruled ball: upheld.
- 6Patrick Bailey — ump said strike, robot ruled ball: overturned.
Our tracked-rulebook zone matched the ABS ruling on 3 of 6 — a zone-definition gap (ABS grades a standardized, height-based zone), not our error.