Blue Notes · Umpire Grade2026-05-01
HOU @ BOS
Home plate: Chris Segal
“The zone shrank when the pitchers needed it most.”
Umpire Grade
91.8% accurate
Run Favor
runs, HOU
ABS Overturns
of 1 reviewed
What this shows — how Chris Segal called the 122 pitches that were taken (no swing), graded against the tracked rulebook strike zone. He got 112 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· challenged
Isaac Paredes vs Jake Bennett - 2+0.09▼5 · 0-0 strike called ball
Trevor Story vs Mike Burrows - 3+0.09▲6 · 0-0 strike called ball
Christian Walker vs Zack Kelly
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
1 pitch went to the robots · 0 overturned (ump overruled) · 1 upheld (ump confirmed). This is Hawkeye ground truth, no model involved.
- 1Carlos Narváez — ump said ball, robot ruled ball: upheld.
Our tracked-rulebook zone matched the ABS ruling on 0 of 1 — a zone-definition gap (ABS grades a standardized, height-based zone), not our error.