Jackson Chourio's Defense Has Gone to Another Level Lately

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When a player comes up at 20 years old, you have to expect their development to continue over their first few years in the big leagues. Bringing a player through the minors that fast requires a team to overlook a few rough edges and accept some on-the-job learning; it's something clubs only do when they have a glaring need or a massive amount of faith in a prospect.

In Jackson Chourio's case, the learning curve has never been hard to see. He struggled mightily at the plate for his first two months in the majors. Since then, he's largely been good, and there are nights—hell, there are fortnights—when he seems to take up the whole screen and impose his will on the game. However, there are also at-bats in which he's plainly not seeing the ball well, or when he's up there without a plan and makes dreadful swing decisions. He's run into some outs on the bases; he doesn't yet have the nous to match his elite speed.

That shows up on defense, too. Often, it's defense that keeps a team from calling a guy up so young; the subtleties of fielding take time to master. Chourio is gifted enough that the Brewers elected to make a huge investment in him even before they called him up, which accelerated the process of promoting him to the bigs. It also meant they were willing to accept some uneven defense. They had to be, because they'd only converted Chourio from a shortstop to an outfielder two years earlier. As in the batter's box, so in the outfield: there would be learning to do.

The good news, of course, is that raw tools play quite well in the outfield. Infielders have to learn the internal clock that governs each play, which changes as one rises through the professional ranks. They have to develop a strong rapport with other infielders, and the physical and mental skills that make building that rapport easy with new people. They have to master a wide variety of plays and the aspects thereof: a quick first step, changes in posture to read tricky hops, and accuracy on throws. That all sounds like stuff you can learn in high school or college; it isn't. The game transforms on you. It gets much, much harder as you progress. The ball is hit harder. Opponents are faster. They more often mishit the ball, but not as many of those mishits are slow, easy-to-read bouncers. The median grounder goes from being a two-hopper to a one-hopper, and from a one-hopper hit slightly downward to one that would be a clean line-drive single at lower levels of baseball. A version of this happens in the outfield, too, but there are fewers components involved in turning a batted ball into an out when it's hit in the air. Just go catch it. Speed can make up for a bad read (sometimes). A late adjustment can produce an out even if you overran the ball.

Chourio got by on his speed and his adjustments for a while. He didn't excel in the outfield, but he didn't embarrass himself or cost the Brewers games, either. He looked good in right field (though a bit rougher in left) in 2024. In 2025, circumstances forced him to play more center field, but he handled that relatively well, too. You wouldn't confuse him with Pete Crow-Armstrong or Dwight Evans, but he was fine.

That descriptor—'fine'—remained apt for the early part of this season, too. Chourio was sidelined early by the hand injury he suffered in early March, but once he returned, he played roughly average defense. He was average or so in May; he was a bit better in June; he was a bit worse in July.

Lately, though, Chourio has turned a corner. He's not guessing and checking anymore. He's not outrunning his mistakes; he's not making as many of them in the first place. And that's opened up a new level for him. He can now make the plays that almost always elude the raw, run-it-down guys.

Less than two months ago, Chourio played a lot of balls like this: a slightly late start, and then a slightly early give-up. He didn't have much confidence in his routes or reads—at least, not enough to take any chances on them.

Lately, though, he's played much more like this: no rush to get the jump, but confidence about the route he chooses and the fearlessness and polish to keep running fast through the catchpoint.

Chourio has made more difficult catches in the last six weeks than in the entire season before that. According to Statcast, he was worth 4 Outs Above Average in August alone. September isn't even 10 days old, but he's already been worth 3 OAA this month. That newfound excellence became especially vivid at the end of Monday's win over the Cubs, when he maintained his speed and got to a ball that would have fallen in front of him before about a month ago.

Watch Chourio in isolation on plays like these, and you can see him brace himself the same way each time. He gets into a wide base just as the ball passes through the hitting zone, and leans into the same hip each time, no matter what. Sometimes, that produces a slightly late start, but it always produces a powerful one. It also forces him to hold an extra quarter-second, so he can read the angle and take off with greater confidence. That's why we're seeing him barrel through the point where he intercepts the flight of the ball—sometimes diving, sometimes sliding fast and smooth, sometimes getting to within a step of the wall before slowing down, but never pulling up shy or needing to make a big, late bend in his route to get there.

This is the latest evidence that Chourio is going from hugely talented work in progress to bona fide superstar. He's gotten more consistent and more lethal at the plate. He can cover more pitches, as he demonstrated by swatting the game-winning single on a high fastball in the bottom of the eighth Monday. Now, he's also demonstrating that polish (and that capacity to dominate, by denying opponents a rally rather than generating one himself) in the field. Over the last few years, Milwaukee's defense has been elite. That's been slightly less true this year. If Chourio is now an elite left fielder, though, the team is one step closer to a complete, elite unit—and one that can finally make it through the gauntlet of October.