The ABS Challenge Data Is In: Catchers Own the Zone

MLB's Automated Ball-Strike (ABS) challenge system debuted in 2026, and two weeks of data — 971 challenges across every team — already reveals a clear pattern. Catchers are winning 61.1% of their challenges. Batters are winning just 46.4%. That 15-point gap wasn't what anyone expected, and it's raising new questions about challenge strategy, catcher value, and how teams should be using the system.

We tracked all 971 challenges through April 13. Here's what we found.

That 54.4% overturn rate is significant. It means umpires are getting more than half of the challenged calls wrong — or, more precisely, more than half of the calls that feel wrong to the players actually are wrong according to the ABS zone. Either way, the system is correcting a lot of pitches.

But the real story isn't in the totals.

Catchers have a 15-point edge, and it's not a fluke

Catchers are challenging called balls — pitches they believe should have been strikes. Batters are challenging called strikes. Both sides have access to the same system. But the outcomes aren't even close.

Catchers are winning 60.6% of their challenges. Batters are winning 46.5%. That's not just a gap — batters are actually losing more challenges than they win. They're using the system and coming out behind.

There are a few possible explanations. Catchers sit directly behind the pitch and have spent their entire careers learning the zone from that angle. They also have an information edge: they called the pitch, they know where the target was, and they can feel when the ball hit their glove closer to the zone than where it crossed. Batters, on the other hand, are reacting to 95 mph from 60 feet away. They feel a pitch was a ball, but that feeling is right less than half the time.

Teams are already splitting into two strategic camps

Some teams have gone heavy on batter challenges. Others have leaned into catchers. The split is dramatic.

The Yankees (NYY) sit far to the right on batter challenges but hover near the middle on success rate. Miami (MIA) went heavily catcher and sits higher. Cincinnati (CIN) is the standout — fewer challenges but the best accuracy in the league. Minnesota (MIN) challenges the most of anyone, with balanced batter/catcher usage and a success rate above average.

Given the 14-point success rate gap, catcher-heavy teams are extracting more value per challenge. Whether that persists — or whether batters get better at picking their spots — is one of the season's open questions.

Does leaning into catcher challenges actually help?

If catchers win more often, teams that use more catcher challenges should have better overall success rates. Here's what the data looks like.

The bottom-left quadrant — batter-heavy teams with low win rates — is where you don't want to be. Washington and Boston both underuse catchers and lose when they challenge. The upper-right cluster shows teams like San Diego and Milwaukee leaning on catchers and winning more. Cincinnati is the outlier: balanced strategy but the best accuracy in baseball, which suggests their catchers (and batters) are just picking better pitches to challenge.

The individual leaders tell the same story

At the player level, the catcher dominance is even more striking.

Catchers

Dillon Dingler is 9-for-10. That's not a skill you can teach — or maybe it is. Either way, if challenge accuracy becomes a measurable, persistent skill, it adds a new dimension to catcher valuation that didn't exist a month ago.

Batters

Acuña challenges more often than any star in baseball — 4.1% of his called pitches, roughly once every 25 takes. But he's only converting a third of them. Compare that to Schwarber, who picks his spots and wins two-thirds. Volume isn't the same as accuracy.

143 at-bats that should have ended didn't

The most tangible impact of the system is what we're calling "K flips" — challenges on two-strike counts that overturn a called third strike. Without ABS challenges, 143 at-bats this season would have ended in strikeouts. Instead, they continued.

Minnesota leads with 11 K flips. That's 11 plate appearances that continued, each one an opportunity for a hit, a walk, or an RBI. On the other side of the ledger, there have been 63 "BB flips" — challenged ball-four calls that were overturned, taking away walks. The net effect is that ABS challenges are putting more balls in play and creating more action.

The early verdict

Two weeks is a small sample, and challenge skill might regress or evolve as players learn the system. But the early data points to a clear conclusion: catchers are the power users of the ABS challenge system, and teams that lean into catcher challenges are getting more out of it.

If this holds, it adds a new dimension to an already valuable position. We've spent years quantifying pitch framing — now we might need to start quantifying challenge IQ, too.

Data through April 13, 2026. Analysis by Malter Analytics. All stats from MLB pitch-by-pitch data via our ABS challenge tracker.