Corbin Carroll is the best left-handed hitter in baseball right now.
It’s been a good year for Carroll, but he wants to break down the data. He has a 152 wRC+. He has a 2.6 WAR. It looks to be his best season ever – a perfect follow-up to his unprecedented season last year.
That Carroll appears to be taking another step forward in 2026 is not news. But the way he does it for sure is this:
Carroll just hits lefties. He was their equal in the first few years of his career. Last year, he was very good in lefty-to-lefty matchups, though that improvement appears to be due to his overall growth at the plate rather than a particular step forward against lefties.
This year? Carroll is the top five hitter in baseball against lefties and the best lefty batter in the mix. If his 219 wRC+ against southpaws had held, it would have been the third-best season by a lefty since we started tracking in 2002:
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Left-Hand Batteries (2002-)
Yes, Barry Bonds is the only one to do this for a full season. The names directly behind Carroll are also from 2026. That alone tells us he’s probably over his skid (as is a .500 BABIP). He likely won’t maintain the magnitude of his lefty-to-lefty performance, but his success against southpaws appears to be more than a small sample size.
First my mind goes to his changes. As Chad Young noted on RotoGraphs last month, Carroll moved from the plate nearly three inches in 2026, the longest change in that direction among all hitters. There are only three players standing away from the plate.
In fact, this is the second year in a row that he has changed his status. Last April, Esteban Rivera detailed the changes Carroll made before 2025. That adjustment was more about his mechanics, with a new setup, loading, and bat technique, than where he stood. This came with all kinds of great results and reshaped his “hot spots”.
In 2024, Carroll was, frankly, terrible at pitches over the inner third of the plate. Esteban expected that last year’s mechanical overhaul would lead to better results in the third round, and he proved to be there. Carroll topped his xwOBACON in home runs-third with 125 points. This year, he has improved again, adding another 146 points:
xwOBACON Plate Coverage Splits By Season
| A year | Inside | In the middle | Outside |
|---|---|---|---|
| 2024 | .238 | .469 | .372 |
| 2025 | .363 | .573 | .487 |
| 2026 | .509 | .497 | .354 |
This makes sense. In retrospect, Carroll took his bat approach with him and changed the pitches he couldn’t connect. The real place has not changed, of course, only his relationship to it. Now you have a greater chance of finding a barrel in the interior than before. The tradeoff is that he is less likely to close the field. We can see that where he has done damage this year has changed:
Interestingly, this season’s plot shows more red — more success — on up-and-away pitches. He simply stopped swinging at them, and pitchers didn’t show that they could hit him in that region very often. Where he used to make contact (albeit rarely), he now takes pitches and pitches that improve for him.
This emphasizes a broad change in approach. Carroll is down four points this year overall. He doesn’t turn to “better” fields, as we might define a field that doesn’t depend on the path of the beat within it. But he split half of the zone to control while giving up the other, banking that pitchers can’t always hit the half of the zone he left. So far, it has worked.
Carroll hasn’t hit well this year either, although it’s unclear if that has anything to do with the change. He has a wRC+ of 120 against them, down from last season’s 148 points. Again, he just lays down pitches and throws them away, and they haven’t been able to stay on that field every time this year. His walk rate against righties is up to a career-best 13.6%, and most of those walks have come on out-of-zone pitches up and away. That said, he’s also hitting righties at the same high clip he did last year (24.7%). The pitches he’s talking about the most this year are down and out, and up and down the middle, but he’s also really explosive against righties this year, in general. His strikeout rate against right-handed pitchers is 29.3%, up from last year’s mark of 24.9%. When he makes contact, though, he gets a barrel — his ISO still starts at two — so it’s possible that this trade will eventually work out for him against righties.
Against lefties? It works perfectly. They can’t make it that high and far, or at least they couldn’t get to this point. Lefties have only gotten four pitches up and away from the strike zone this year. The only place they can consistently get the ball in the zone is over the middle or inside the three, playing right into Carroll’s new swing.
It makes sense. To throw to the outer part of the plate, lefties must cut the pitch across the board. If they miss – or even if Carroll just catches their pitch before it has a chance to reach the target – he usually gets the middle part of the plate. When he does, he punishes them: His strikeout rate in center and infield is 66.7%, and his base hit rate is 18.2%.
That creates two options for pitchers left: They can drill the fastball, where Carroll wants them to throw it, or they can sweep the bender, risking the hanger. Carroll, to his credit, seems to know this and has reworked his approach. He lowered his first-pitch swing rate against lefties to 30.8%. He sees more 1-0 stats than anyone else in lefty-to-lefty matchups. And once he gets into that 1-0 count, his swing rate jumps to 43.8%.
What did he ride when he got to the front? Especially breaking balls. Lefties almost always throw Carroll the first fastball to try to get ahead. If they miss, they often come back with the bender of their choice, trying to sneak back into the field. That usually didn’t work for them:
Carroll is swinging at 63.2% of the breaking balls he sees from lefties when he is ahead in the count. That’s a 13-point increase from last season, and far from his favorite frontcourt. He complains about these benders just 8% of the time in 2026 – down from 35.3% last year. I wouldn’t call the contact they make high, as most of them come on the ground, but hard grounders to the pull side can sometimes result in extra bases for a player with Carroll’s speed.
It’s good to see the odd lefty plate appearance that hasn’t gone well for Carroll this season. There was a nice balance over the weekend, when the Mariners brought in lefty bullpen ace Gabe Speier to face Carroll with the game on the line. Speier started him with a fastball up and inside. Carroll expected this too just he missed it. Speier threw another leadoff fastball that Carroll could only watch, going down 0-2. Speier threw a third straight fastball to the top. Carroll couldn’t let it go, throwing at it for the third strike.
Look, I can put a good spin on anything, but I almost think that at-bat highlights what made Carroll so great compared to the rest. He shortened what they threw him to two pitches: A fastball up, or a breaking ball. His decision to swing depends largely on the count and whether the pitcher should hit the spot. To get him out, the lefty has to be nearly as perfect as Speier is, blowing that first heater through him to take control. And even then, Carroll was clearly ready – he knew what was coming and took the “A” turn. From there, he hoped Speier would miss the top even count. Unfortunately, Speier didn’t, and even Carroll doesn’t have a good 0-2 split.
Regardless of the at-bat, Carroll has lefties in a pinch. They are not equipped to attack his weaknesses, limiting them to a set of predictable options. And few can beat him with his strength, especially when he knows what’s coming. How do you beat Carroll right now? However, it seems they often don’t.
