Yainer Diaz isn’t completely himself yet, but he has still been exactly what the Astros needed

Yainer Diaz isn’t quite hitting like the guy who burst onto the scene and finished fifth in the 2023 Rookie of the Year voting, but what he’s shown recently has been quite encouraging. Sure, you can stare at the numbers long enough and find plenty to grumble about. The chase rate is the chase rate. The walks aren’t coming. 

So nobody’s confusing this version with the guy who put up a 127 wRC+ three years ago, but grading a catcher against his ceiling isn’t always the best idea. A more useful comparison is the one where the alternative behind the plate was, for six weeks, a genuine offensive black hole. While Diaz was out, Houston’s catcher spot was nearly an automatic out. Diaz is back now, maybe not all the way, but it’s been plenty.

Yainer Diaz has handed the Astros lineup length they badly needed

Diaz followed up his excellent rookie year with a 116 wRC+ while providing generally decent enough defense. He was still useful last year with a 92 wRC+, but did hit 20 home runs and played solid defense. Still, he was trending the wrong way and opened this season about as poorly as possible. When he went on the IL, he was hitting .238/.255/.347. Even if he is a notch or two below what he was for a couple of seasons, he’s still better than that.

But since his return, he’s been much better. No, a .270/.325/.405 line isn’t elite. It’s just a .730 OPS. He’s hit one home run and doubled twice in 10 games. But boy, is it a nice change from what the Astros had been getting.

Christian Vazquez was a good story and a very good defender, but he’s 35 and hasn’t hit since really early in the 2022 season. And that’s the job description of a backup catcher sometimes. He signed a minor league deal and was set to provide exactly what the Astros were hoping to get. But behind him, things thin out very fast.

Caesar Salazar is nothing more than organizational depth. Collin Price made his debut this year and is very much a project. Top catching prospect Walker Janek has been hurt and scuffling, which means they didn’t really have too many options. So, with the options behind Vazquez, things were even bleaker with Diaz out. 

And this is why a somewhat mediocre line turns into a real contribution. The top of the Astros' order has plenty of thump. We know that Yordan Alvarez is great, and both Jeremy Peña and Isaac Paredes have been hitting well. Christian Walker has been up and down, but he can contribute. But with Carlos Correa’s injury and Jose Altuve’s decline, along with Jake Meyers struggling to match last year's mark and Cam Smith continuing to struggle, the lineup doesn’t run nearly as deep as the Astros had expected when they broke camp. So a catcher putting up decent numbers is huge. 

Right now, the Astros don’t have the luxury of giving away outs at any spot. They’re doing everything they can to claw their way back into the race. They’re close because the division is bad, but this isn’t a juggernaut that can absorb a dead spot in the lineup and just shrug it off. This is a flawed team that is looking for every marginal run in a division race that may come down to the last week of the season. The gap between a replacement-level catcher and a competent one is worth actual wins. And the Astros need those desperately.

We don’t have to pretend that Diaz is fixed. His plate discipline is and will always be a question. The framing is shaky. There’s no guarantee what he’s done since his return holds. Small samples coming off injuries can go either way. But the Astros didn’t need him to return to the 2023 or 2024 form (though they’d have liked it). What they needed was a functional big league bat catching most days, so the lineup stops leaking runs at the bottom of the order. It’s a low bar, sure, but Diaz is clearing it. For a team with this little depth, that’s pretty important.

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