Trust Your Catcher

The split gets more interesting when you stop looking at the whole pile and start looking at the count.

On 0-0 pitches, defensive catchers are converting at 66.7%, while batters are at 46.4%. In non-full two-strike counts, catchers are at 59.3% and batters are at 37.2%. Full counts are a little smaller and noisier, but they lean the same way: catchers at 47.1%, batters at 32.9%.

That feels like baseball. A hitter who just took strike three has every reason in the world to hate the call. The pitch ended his plate appearance. Maybe it nicked the edge. Maybe it started on the plate and ran. Maybe he froze because he was protecting against something else. Maybe he was right. But sometimes the pitch simply beat him, and the emotion of the result can look a lot like conviction.

The catcher is watching a different movie. He knows where the pitcher was trying to go, how the pitch got there, how the umpire has been calling that lane, and whether the miss looked like a real miss or just a good pitch. That doesn't make catchers automatic. Edgar Quero is 14-for-35 and Drew Millas is 7-for-18 on verified defensive catcher challenges, while Salvador Perez is 19-for-24 and Will Smith is 18-for-27. But league-wide, the catcher view is winning the challenge game more often than the hitter view.

If I were coaching this, I wouldn't tell hitters to stop challenging. That's too blunt, and there are plenty of times when the hitter gets the best look. I'd start with count discipline. A two-strike challenge should have to clear a higher bar than a 1-0 pitch, especially when the count isn't already full, because the early returns say that's where emotion and certainty are easiest to confuse.

The next obvious question is whether catchers are getting a cleaner menu of pitches. Maybe the edge isn't really catcher skill. Maybe catchers are just challenging more fastballs, and fastballs are easier to read because they're straighter, firmer, and more often tied to a clear target. That would be a tidy explanation, but it doesn't really fit the data.

Fastballs are the biggest bucket for everyone, which is what you'd expect in a challenge sample. But the mix isn't wildly different: 62.2% of verified catcher challenges are fastballs, compared with 63.9% of batter challenges. And the catcher edge stays alive across pitch families. Catchers are at 62.1% on fastballs, 56.8% on breaking balls, and 61.0% on offspeed. Batters are at 47.4%, 45.3%, and 44.3% in those same buckets.

The pitch-type details tell the same story. Catchers are ahead on four-seamers, sinkers, cutters, sliders, and changeups. That doesn't prove the catcher is reading the pitch better in some mystical way. It probably says something more ordinary and more baseball: the catcher knows what was called, where it was supposed to go, how it was supposed to move, and how far the mitt had to travel to receive it. The hitter is solving the pitch after release and then judging the call after the fact.

That matters because the catcher isn't judging the pitch as a standalone object. He knows whether the staff was trying to steal the bottom, expand away, climb above the hands, or backdoor something to the edge. That pre-pitch information isn't everything, but it's not nothing. A catcher doesn't just see the pitch; he knows the plan.

I came in expecting catchers to get better as the game went on. That made sense in my head. By the fourth or fifth inning, the catcher has seen the umpire's zone for a while. He knows whether the low pitch is getting called, whether the outside corner to righties has been there, whether the top of the zone is real that night or just theoretical. My guess was that catchers would start separating the umpire's zone from the ABS zone and get sharper later, but that's not what showed up.

The best catcher results are early. In innings 1-3, verified defensive catchers are at 66.8%. In innings 4-6, they fall to 57.9%. In innings 7-9, they sit at 57.4%. Extras bounce back in a tiny sample, but there are only 14 of those challenges, so I wouldn't build a theory around it.

I don't think that means catchers suddenly forget the zone after the third inning. I think it probably says more about the pitches that get challenged later. A late-game challenge may be a lower-conviction try because the team is running out of places to use it. It may come against a reliever with a different look, more movement, or more velocity. It may come in a tighter spot where everyone is more willing to take a shot.

The important part is that my first explanation didn't survive the data. Catchers are winning the challenge game, but the evidence doesn't yet support the clean little story that they learn the umpire and get sharper as the night goes on. The advantage is real, while the reason for the timing pattern is still open.

It's tempting to call this the next version of pitch framing, but I don't think that's quite right. Framing is persuasion. The catcher is trying to make a borderline pitch look like a strike before the call happens. ABS challenging is judgment after the call has already been made. The catcher is no longer selling the pitch to the umpire; he's deciding whether the umpire's call can survive the box.

The skills overlap because both live on the same thin strip of baseball real estate. A good receiver understands the bottom of the zone, the glove-side edge, the way a breaking ball can look like it caught more plate than it did, and the way a fastball can feel like a strike because it never really bends. That knowledge should help when the catcher has to decide whether to challenge.

But the measurement is different. Framing value comes from thousands of quiet pitches. Challenge value comes from a handful of loud ones. That's why raw overturn rate is only the first pass. The next version of this should account for where the pitch was, what type of pitch it was, what the count was, who was catching, who was hitting, and whether the call was a ball or a strike.

Still, even the first pass is telling us something useful: in the early challenge era, catchers aren't just along for the ride. They're one of the main ways a team turns ABS from a rule change into an edge.

If I were building the challenge plan from this, I'd start with a simple clubhouse rule: on defense, the catcher gets the first voice.

That doesn't mean the pitcher never gets one. Some pitchers know exactly when a pitch clipped the zone, and there are going to be moments when the mound has a strong read. But pitcher challenges are rare so far, and the mound isn't the best angle for most edges. The catcher has the target, the glove, the pitch shape, and the call all in front of him. He should usually be the defensive trigger.

On offense, I'd be more careful. A hitter in a normal count can absolutely have a good read. A hitter who just got rung up may also have a good read, but the early numbers say that's where teams have to protect themselves from the heat of the moment. The question before a two-strike challenge should be very plain: did you see it miss, or did you just hate the call?

That's where this gets fun to me. ABS is supposed to be objective, but the strategy around it is still deeply human. The best teams won't just ask whether the pitch was right. They'll ask who saw it best, when to trust him, and when the count itself is playing tricks. For now, I keep landing in the same place: trust your catcher.