MLB ABS Umpire Tracker

Every Automated Ball-Strike challenge in the 2026 MLB regular season, joined to the home-plate umpire who made the original call. Refreshed daily after the last game.

ABS Challenges

423

events captured

Overturned

233

calls flipped by ABS

League Overturn Rate

55.1 %

of all challenges

Plate Umpires

tracked this season

Last Game

2026-09-02

most recent ingest

Trends, patterns & fun facts

The catcher knows best

58.7 %

Catchers win 58.7% of the challenges they call. Pitchers? Just 57.1%. Don't waste your challenges on what the guy on the mound thinks.

ABS is pitcher-friendly

+ 10

Net strikeouts added by overturned challenges. ABS has handed pitchers 10 more K's than it's taken away — and removed 7 walks on balance.

First-pitch ambush

67.4 %

The 1-0 count is challenged most often AND overturned at 67.4%. Hitters and catchers are leading off at-bats with high-confidence challenges.

Sharpest challengers

ATH

The ATH lead the league with a 85.7% challenge-success rate (minimum 8 attempts). Their bench knows when to pull the trigger.

The shadow zone — every overturned pitch, on the plate

Catcher's view. Each dot is a pitch the umpire called that ABS later ruled on. Red dots were overturned (umpire missed it); gray dots were confirmed (umpire got it right). The rectangle is the ABS strike zone (17″ wide, normalized to batter height).

Overturned (233) Confirmed (190) ABS strike zone

Reading the plate. Red dots inside the dashed zone = umpire called a ball on a strike — pitcher won that challenge. Red dots outside the dashed zone = umpire called a strike on a ball — batter won. Notice the cluster of red just outside the right edge: those are the famous "off-the-plate" called strikes that catchers know to challenge. Heart-of-plate is mostly gray because heart-of-plate calls are rarely close enough to challenge.

League distribution

Full leaderboard

🚨 = ≥65% overturned (8+ challenges) ⚠️ = ≥60% overturned (5+ challenges) Reliable % = Wilson 95% lower bound — corrects for small samples RV swing = absolute run-value change from overturned calls

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Why two percentages? Raw % treats a 1-of-1 the same as a 25-of-50 — both show 100% / 50%. The Reliable % column applies the Wilson 95% confidence lower bound, which shrinks small-sample numbers toward the league mean. Sort by Reliable % to see which umpires the ABS system is correcting consistently, not just occasionally with luck.

The fair view — accuracy on every called pitch

Challenge data only covers ~5% of pitches and is biased toward calls players think are wrong. The view below is built from every called pitch in 2026 (104,000+), classified against the ABS strike zone independently. This is the unbiased accuracy metric.

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What "stolen strikes" means. A called strike on a pitch that the ABS zone says was a ball — the umpire gave the pitcher a strike that wasn't there. Lost strikes = the inverse (ball called on a pitch in the zone). The Net bias column is positive when the umpire systematically favors pitchers (stolen − lost). Across MLB, stolen strikes outnumber lost strikes ~20-to-1 — umpires are pitcher-friendly, and ABS now measures by how much.

Biggest moments of the season

CIN @ CHC

+1.156

Run-value swing

Hoerner, Nico at the plate, Garcia, Julian pitching · inning 4 · 3-2 count
Original call: ball → ABS: strike · challenged by catcher

⚡ STRIKEOUT ADDED

HP: Chad Whitson · Aug 29

BAL @ COL

+0.984

Run-value swing

Holliday, Jackson at the plate, Hughes, Gabriel pitching · inning 3 · 3-2 count
Original call: ball → ABS: strike · challenged by catcher

⚡ STRIKEOUT ADDED

HP: John Libka · Sep 1

MIA @ WSH

+0.978

Run-value swing

Crews, Dylan at the plate, Pérez, Eury pitching · inning 3 · 2-2 count
Original call: ball → ABS: strike · challenged by catcher

⚡ STRIKEOUT ADDED

HP: Laz Diaz · Aug 28

SD @ TB

+0.781

Run-value swing

Bowen, Jase at the plate, Rodríguez, Manuel pitching · inning 9 · 3-2 count
Original call: ball → ABS: strike · challenged by catcher

⚡ STRIKEOUT ADDED

HP: Tyler Jones · Aug 30

MIL @ CHC

+0.713

Run-value swing

Hoerner, Nico at the plate, Harrison, Kyle pitching · inning 4 · 3-2 count
Original call: strike → ABS: ball · challenged by batter

⚡ STRIKEOUT REMOVED

HP: Tripp Gibson · Aug 31

KC @ CLE

+0.703

Run-value swing

Jensen, Carter at the plate, Herrin, Tim pitching · inning 7 · 2-2 count
Original call: ball → ABS: strike · challenged by catcher

⚡ STRIKEOUT ADDED

HP: Paul Clemons · Aug 30

BAL @ COL

+0.633

Run-value swing

Mayo, Coby at the plate, Manfredi, Mark pitching · inning 7 · 3-2 count
Original call: strike → ABS: ball · challenged by batter

⚡ STRIKEOUT REMOVED

HP: Sean Barber · Aug 31

KC @ TOR

+0.633

Run-value swing

Straw, Myles at the plate, Lange, Alex pitching · inning 7 · 3-2 count
Original call: strike → ABS: ball · challenged by batter

⚡ STRIKEOUT REMOVED

HP: Mark Wegner · Aug 27

CWS @ MIN

+0.633

Run-value swing

Clemens, Kody at the plate, Newcomb, Sean pitching · inning 6 · 3-2 count
Original call: ball → ABS: strike · challenged by catcher

⚡ STRIKEOUT ADDED

HP: Lance Barrett · Aug 29

#10

MIA @ WSH

+0.429

Run-value swing

Vivas, Jorbit at the plate, Vodnik, Victor pitching · inning 7 · 3-2 count
Original call: strike → ABS: ball · challenged by batter

⚡ STRIKEOUT REMOVED

HP: Erich Bacchus · Aug 30

#11

BOS @ NYY

+0.429

Run-value swing

Wells, Austin at the plate, Whitlock, Garrett pitching · inning 8 · 3-2 count
Original call: ball → ABS: strike · challenged by catcher

⚡ STRIKEOUT ADDED

HP: Hunter Wendelstedt · Aug 29

#12

BAL @ COL

+0.429

Run-value swing

Alonso, Pete at the plate, Manfredi, Mark pitching · inning 6 · 3-2 count
Original call: strike → ABS: ball · challenged by batter

⚡ STRIKEOUT REMOVED

HP: Sean Barber · Aug 31

Latest overturned calls

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Every challenge

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About this dashboard. The MLB Automated Ball-Strike Challenge System debuted league-wide in the 2026 season. Each team gets two challenges per game (kept on success, lost after two failures). Only batters, pitchers, and catchers may challenge. The ABS strike zone is 17″ wide, 53.5% of batter height at top, 27% at bottom, measured at the middle of the plate.

Reading note. Overturn rate is a biased sample — players only challenge ~5% of pitches, and they prefer to challenge calls they think are wrong. A high overturn % means an umpire is being challenged successfully when challenged — not that they're miscalling every pitch. For the fairer per-pitch accuracy view, ingest Statcast pitch data with abs-umpires daily-refresh --with-statcast.

Sources. Event data: Savant /abs page (vizChallenges). Umpire crews: MLB StatsAPI schedule?hydrate=officials. Refreshed daily at 10:00 UTC.