Shelby Miller: Fixed?

There’s a sort of check list you can go to when a pitcher’s performance changes. You run down the possible reasons, and if there’s no box checked, you shrug and figure a few bounces have gone differently and that was all that happened.

So what do you do when a pitcher has a breakout performance, then suffers a setback and then looks like he’s re-found what he’s lost? Especially when that pitcher doesn’t have any obvious checkmarks on the checklist? What do you say about Shelby Miller’s up-and-down year so far?

Before I talk to any pitcher, I sketch out something like the following table. So that checklist is literal in my case.

2013 Velo 2013 SwStr 2013 Usage 2014 Velo 2014 SwStr 2014 Usage
Four-Seamer 94.4 11.7% 70.1% 94.3 8.7% 68.2%
Two-Seamer n/a n/a n/a 94.1 6.7% 3.7%
Curve 80 7.8% 18.5% 77.7 4.5% 19.2%
Cutter 90 9.0% 4.2% 87.8 12.2% 6.3%
Change 85.6 8.0% 6.4% 86.7 3.1% 2.3%

For this, I’d want to zero in on the curveball, which is seemingly less effective this year according to Brooks Baseball’s numbers. The fastball hasn’t seen too much of a difference in velocity, the change isn’t a primary pitch for him and wasn’t ever that great and the cutter has been better this year.

But check out the curveball’s vital stats on a checklist table of another sort.

Curve 2013 2014
usage 18.5% 19.2%
velocity 80.0 77.7
x-mov 6.6 7.6
y-mov -4.4 -5.2
x release 1.3 1.3

Does that paint the picture of a radically different pitch? For every mile per hour it lost in velocity, the curve gained a bit of vertical and horizontal movement. Now more of a roundhouse curve than it’s ever been, Miller’s yakker should (theoretically) have the reverse platoon splits to marry well with his improving cutter.

So why the downturn in effectiveness from the curve? Not only are his whiffs down by almost half, his ground-ball rate on the pitch is down to 30% — from 43% last year. It reads like a below-average pitch on paper. And yet it still looks like this.


A year after he put up 173 innings with a 3.06 ERA backed by a 3.67 FIP, Miller responded with a 3.74 ERA backed by a 4.54 FIP. Could be easy enough, in the light of only small changes in stuff and no traditional luck estimators out of whack — batting average on balls in play, strand rate and home runs per fly ball all favor the pitcher or are league average in both years — to say this year tells us more about his true talent than last year. That’s what the projections would say anyway, as they weight recent performance slightly heavier than past performance.

But how about his *most* recent performances? Since the beginning of August, Miller’s ERA is less than three. He’s been walking fewer batters (2.6 per nine, in line with his first two years). And other than a slight increase in curveball usage (up over 20%), most of his stuff has been the same.

Except maybe one thing: Check out his heatmaps for early in the season, on the left, and for August and September, on the right.


We’ve written a lot here about how the high fastball can be effective, and how there’s recent evidence hitters are having a harder time with high fastballs. Throwing more high fastballs might be leading to the higher fastball whiff percentages — Miller is back over 10% whiffs on the fastball for the past two months for the first time this season. At least the fastball is back to glory. After all, Miller’s late-season heat map looks more like his 2013 heat map than his early-season one:


As a curveball pitcher, it could be important to mask the pitch with a high fastball, and that could be how different fastball location has made his seemingly similar curve less effective this year. But if this is true, it hasn’t yet taken root. Miller’s curve got around 5% whiffs in August and September. Perhaps he hasn’t completely fixed what was once broken, but the curve doesn’t seem to be hanging as much now.

chart (33)

It’s true that in small samples, the renewed dedication to the high fastball could just be due to the particular matchups that the Cardinals saw in the late season. His past two games have seen the highest average vertical location for his fastball in his career. Since we’re previewing his start against the Giants tonight, though, this adjustment seems important.

And now that we’ve gone through most of my preparation for the interview, it’s time to go to the player. In a press conference. With one question.

Question: You really did well late in the season, but it didn’t seem like much changed about your arsenal in terms of the pitches you threw and their velocity and movement. Did you maybe change something about the location, maybe throw the fastball high in the zone or anything like that?

Shelby Miller: You know no, not for the most part. We always have kind of a game plan going into it and I’ve always been a guy who — don’t shake the catcher too much. Following guys that have been around for a while and know these hitters a little better than I do, that’s what I go with. When I feel comfortable with a certain approach, I’ll go with a certain pitch. But for the most part, these guys do an extremely good job calling games and make my job a lot easier. But for the most part, same pitches, same scenarios, not really changing up anything pitch-wise.

Thanks to user fanforever on for the GIF.

With a phone full of pictures of pitchers' fingers, strange beers, and his two toddler sons, Eno Sarris can be found at the ballpark or a brewery most days. Read him here, writing about the A's or Giants at The Athletic, or about beer at October. Follow him on Twitter @enosarris if you can handle the sandwiches and inanity.

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7 years ago

We went through this two years ago except in AAA. Pretty rough first half, accompanied by a tedious amount of “he’s finished” proclamations from short-sample prospect watchers, only to have him turn it around in the second half. At this point the only thing I’m willing to predict is inconsistency. Usually with a guy like this I’d chalk it up to mental approach/resilience, but I remember one start in particular this year where he got to an inning where he was missing up-and-in (to a righty) on everything. Like regardless of where Yadi set up, he just couldn’t put it there.

A couple years ago, one of the ways they fixed him was that they banned him from shaking off the AAA catcher (which makes his quote above kind of funny). That’s what made his struggles this year peculiar, because he mostly struggled pitching to Yadi, who is one of the premiere backstops in the game, and who he presumably wasn’t shaking off constantly. His second half resurgence largely coincides with pitching to other guys.

But yeah, I think he’s going to be one of those guys like Burnett who sometimes shows why everyone loved him, and at other times drives fans nuts. Which is actually a pretty good outcome for an internally developed prospect.

7 years ago
Reply to  Sean

Actually much of his strong finish was in September after Yadi was back. It’s probably like you said about Burnett, he just has to get a consistent approach and then the talent will be able to come through.

7 years ago
Reply to  tz

But now that Yadi’s hurt and not available [… or IS he?], does that suggest he’s more likely than not to get beaten up today by some gigantic smally ball?

7 years ago
Reply to  Sean

I was going to note what TZ said. He actually was pretty mediocre all season long, then suddenly in Sept, he went from like 1.8 K/BB to over 5. So he earned that great month, though got some random luck as his BABIP was low twos.