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

432

events captured

Overturned

241

calls flipped by ABS

League Overturn Rate

55.8 %

of all challenges

Plate Umpires

tracked this season

Last Game

2026-05-19

most recent ingest

Trends, patterns & fun facts

The catcher knows best

59.1 %

Catchers win 59.1% of the challenges they call. Pitchers? Just 16.7%. Don't waste your challenges on what the guy on the mound thinks.

ABS is pitcher-friendly

+ 7

Net strikeouts added by overturned challenges. ABS has handed pitchers 7 more K's than it's taken away — and removed 4 walks on balance.

First-pitch ambush

70.7 %

The 0-1 count is challenged most often AND overturned at 70.7%. Hitters and catchers are leading off at-bats with high-confidence challenges.

Sharpest challengers

The SF lead the league with a 83.3% 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 (241) Confirmed (191) 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 @ PHI

+0.689

Run-value swing

Stewart, Sal at the plate, Luzardo, Jesus pitching · inning 4 · 2-2 count
Original call: strike → ABS: ball · challenged by batter

⚡ STRIKEOUT REMOVED

HP: Will Little · May 19

CHC @ CWS

+0.664

Run-value swing

Suzuki, Seiya at the plate, Davis, Tyler pitching · inning 10 · 1-2 count
Original call: strike → ABS: ball · challenged by batter

⚡ STRIKEOUT REMOVED

HP: Chris Segal · May 17

TOR @ NYY

+0.633

Run-value swing

Judge, Aaron at the plate, Cease, Dylan pitching · inning 4 · 3-2 count
Original call: strike → ABS: ball · challenged by batter

⚡ STRIKEOUT REMOVED

HP: John Tumpane · May 19

BAL @ WSH

+0.633

Run-value swing

Mayo, Coby at the plate, Schultz, Paxton pitching · inning 9 · 3-2 count
Original call: strike → ABS: ball · challenged by batter

⚡ STRIKEOUT REMOVED

HP: Chris Conroy · May 16

LAD @ SD

+0.633

Run-value swing

Freeman, Freddie at the plate, King, Michael pitching · inning 7 · 3-2 count
Original call: strike → ABS: ball · challenged by batter

⚡ STRIKEOUT REMOVED

HP: Nate Tomlinson · May 18

BAL @ WSH

+0.633

Run-value swing

Ward, Taylor at the plate, Cavalli, Cade pitching · inning 6 · 3-2 count
Original call: ball → ABS: strike · challenged by catcher

⚡ STRIKEOUT ADDED

HP: Chris Conroy · May 16

AZ @ COL

+0.589

Run-value swing

Moreno, Gabriel at the plate, Halvorsen, Seth pitching · inning 9 · 2-2 count
Original call: ball → ABS: strike · challenged by catcher

⚡ STRIKEOUT ADDED

HP: Ryan Blakney · May 15

KC @ STL

+0.511

Run-value swing

Pages, Pedro at the plate, Strahm, Matt pitching · inning 9 · 2-2 count
Original call: ball → ABS: strike · challenged by catcher

⚡ STRIKEOUT ADDED

HP: Will Little · May 15

STL @ ATH

+0.501

Run-value swing

Heim, Jonah at the plate, Liberatore, Matthew pitching · inning 5 · 2-2 count
Original call: ball → ABS: strike · challenged by catcher

⚡ STRIKEOUT ADDED

HP: Chad Whitson · May 13

#10

NYM @ WSH

+0.501

Run-value swing

Baty, Brett at the plate, Griffin, Foster pitching · inning 3 · 2-2 count
Original call: ball → ABS: strike · challenged by catcher

⚡ STRIKEOUT ADDED

HP: Clint Vondrak · May 19

#11

BAL @ TB

+0.501

Run-value swing

DeLuca, Jonny at the plate, Bradish, Kyle pitching · inning 1 · 2-2 count
Original call: ball → ABS: strike · challenged by catcher

⚡ STRIKEOUT ADDED

HP: Mark Wegner · May 19

#12

NYM @ WSH

+0.500

Run-value swing

Baty, Brett at the plate, Schultz, Paxton pitching · inning 12 · 2-0 count
Original call: ball → ABS: strike · challenged by catcher

HP: Todd Tichenor · May 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.