The Best ABS Challengers Aren't Batters. They're Catchers.

The Raw Gap

In MLB's new ABS challenge system, both batters and catchers can challenge a called ball or strike. Through the first 19 days of the 2026 season, catchers are significantly better at it.

Three-panel comparison of batter vs catcher challenge performance. Catchers win more often (60.6% vs 45.5%), extract more value per challenge (0.062 vs 0.050 runs), and do it on closer pitches (1.19" vs 1.44" from the zone edge).

The odds ratio is 1.85 (chi-square p = 4.96×10^-6). Catchers are nearly twice as likely to successfully overturn a call.

It's Not Because They Pick Easy Ones

The obvious counter-argument: catchers only challenge when it's obvious. They're more conservative, so they naturally win more.

The data says the opposite. The average pitch challenged by a catcher was 1.19 inches from the zone edge. For batters: 1.44 inches. Catchers are challenging closer pitches — tighter calls, harder to get right — and still winning more often.

A logistic regression controlling for count bucket and edge distance still shows a significant catcher advantage: OR = 1.66, 95% CI [1.13, 2.43], p = 0.009. The catcher edge isn't explained away by pitch selection.

The Edge Holds in Every Count Bucket

Catchers outperform batters in early, middle, and late counts:

The gap is largest in early counts (+18.5pp at 0-0/0-1/1-0) but still substantial in late counts (+14.7pp), where the run-value stakes are highest. In late counts, catchers captured 0.119 runs per challenge vs 0.090 for batters.

The 3-2 Case Study

The full count crystallizes the advantage. Catchers and batters challenged at nearly identical volume — 50 vs 47 — but the outcomes diverged:

• Catcher overturn rate: 53.1%. Batter: 39.0%. Gap: +14.1pp.
• Catcher run value: 8.28 runs. Batter: 4.14 runs. Double the value from equal volume.
• Average edge distance: catchers challenged at 0.94 inches from the edge. Batters at 1.88 inches.

At the full count, catchers are challenging pitches that are literally half the distance from the edge that batters are — tighter, harder calls — and winning at a 14-point-higher rate. This is a genuine skill difference, not a selection artifact.

Why Catchers See It Better

The most likely explanation is simple: catchers see the pitch arrive. They're positioned behind the plate with an unobstructed view of the ball crossing the zone. They see the trajectory, the location, and the umpire's call simultaneously. Batters are processing three things at once: should I swing, where is this pitch, and was that call right?

This is consistent with our earlier catcher framing analysis — the ABS era doesn't eliminate the catcher's zone expertise. It gives it a new outlet.

But Team Policy Isn't the Full Answer

If catchers are better challengers, should teams just let catchers handle everything? The team-level data suggests it's not that simple. Among teams with 20+ challenges, catcher share has essentially no correlation with total value captured (r = 0.024).

The Dodgers are heavily catcher-led (73% catcher share) and strong. But the Yankees lean batter-heavy (36% catcher share) and still perform well. The White Sox are catcher-led (63%) and struggled.

The takeaway: individual catcher skill matters more than a blanket "let catchers challenge" policy. Some catchers are elite challenge operators. Others aren't. The next question — which catchers, and can we predict it? — needs more data.