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

418

events captured

Overturned

217

calls flipped by ABS

League Overturn Rate

51.9 %

of all challenges

Plate Umpires

tracked this season

Last Game

2026-08-24

most recent ingest

Trends, patterns & fun facts

The catcher knows best

54.1 %

Catchers win 54.1% of the challenges they call. Pitchers? Just 87.5%. Don't waste your challenges on what the guy on the mound thinks.

ABS is pitcher-friendly

+ 8

Net strikeouts added by overturned challenges. ABS has handed pitchers 8 more K's than it's taken away — and removed 0 walks on balance.

First-pitch ambush

58.3 %

The 0-1 count is challenged most often AND overturned at 58.3%. Hitters and catchers are leading off at-bats with high-confidence challenges.

Sharpest challengers

MIA

The MIA lead the league with a 72.7% 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 (217) Confirmed (201) 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

SD @ NYM

+1.156

Run-value swing

Ewing, A.J. at the plate, Ray, Robbie pitching · inning 2 · 3-2 count
Original call: strike → ABS: ball · challenged by batter

⚡ STRIKEOUT REMOVED

HP: Laz Diaz · Aug 18

CIN @ AZ

+0.850

Run-value swing

McLain, Matt at the plate, Littell, Zack pitching · inning 4 · 3-1 count
Original call: strike → ABS: ball · challenged by batter

⚡ WALK ADDED

HP: Mark Ripperger · Aug 22

TOR @ NYY

+0.781

Run-value swing

Bateman, Brett at the plate, De los Santos, Yerry pitching · inning 4 · 3-2 count
Original call: strike → ABS: ball · challenged by batter

⚡ STRIKEOUT REMOVED

HP: Dan Iassogna · Aug 22

WSH @ MIA

+0.713

Run-value swing

Marsee, Jakob at the plate, Lord, Brad pitching · inning 3 · 3-2 count
Original call: ball → ABS: strike · challenged by catcher

⚡ STRIKEOUT ADDED

HP: Rob Drake · Aug 21

CIN @ AZ

+0.704

Run-value swing

Waldschmidt, Ryan at the plate, Johnson, Pierce pitching · inning 7 · 1-2 count
Original call: ball → ABS: strike · challenged by catcher

⚡ STRIKEOUT ADDED

HP: Dan Bellino · Aug 21

ATH @ HOU

+0.680

Run-value swing

Varsho, Daulton at the plate, Ginn, J.T. pitching · inning 1 · 1-2 count
Original call: ball → ABS: strike · challenged by catcher

⚡ STRIKEOUT ADDED

HP: Jonathan Parra · Aug 21

AZ @ BOS

+0.633

Run-value swing

Perdomo, Geraldo at the plate, Suarez, Ranger pitching · inning 2 · 3-2 count
Original call: strike → ABS: ball · challenged by batter

⚡ STRIKEOUT REMOVED

HP: D.J. Reyburn · Aug 18

CHC @ SEA

+0.633

Run-value swing

Rodriguez, Julio at the plate, Rea, Colin pitching · inning 8 · 3-2 count
Original call: ball → ABS: strike · challenged by catcher

⚡ STRIKEOUT ADDED

HP: Brennan Miller · Aug 21

SF @ BOS

+0.633

Run-value swing

Gilbert, Drew at the plate, Weissert, Greg pitching · inning 7 · 3-2 count
Original call: ball → ABS: strike · challenged by catcher

⚡ STRIKEOUT ADDED

HP: James Hoye · Aug 22

#10

TEX @ CWS

+0.627

Run-value swing

Burger, Jake at the plate, Urquidy, Jose pitching · inning 1 · 2-2 count
Original call: strike → ABS: ball · challenged by batter

⚡ STRIKEOUT REMOVED

HP: Chris Guccione · Aug 24

#11

BOS @ MIA

+0.613

Run-value swing

Abreu, Wilyer at the plate, Gibson, Cade pitching · inning 9 · 3-2 count
Original call: strike → ABS: ball · challenged by batter

⚡ STRIKEOUT REMOVED

HP: Ron Kulpa · Aug 24

#12

ATH @ KC

+0.613

Run-value swing

Massey, Michael at the plate, Perkins, Jack pitching · inning 5 · 3-2 count
Original call: strike → ABS: ball · challenged by batter

⚡ STRIKEOUT REMOVED

HP: Andy Fletcher · Aug 18

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.