Check out 2022 zStats for pitchers after 2 months of playing


As anyone who does a lot of work with projections can probably tell you, one of the most annoying things about modeling future performance is that the results themselves are a small sample size. Single seasons, even full seasons over 162 matches, still feature highly unexpected hits, such as a hitter or bowler with a BABIP low or high enough to be practically unsustainable. For example, if Luis Araz finished the season with a score of 0.350, we don’t actually know that the average drop of 0.350 was the correct season drop. There’s no divine baseball locker to pounce and let you know if it was “actually” a .350 hitter who did what he was supposed to do, or a .320 hitter who got lucky, or a .380 hitter who had bad luck. If you flip a coin eight times out of 10 and have no reason to believe you have a special ability to flip a coin, you will eventually see the 50/50 split method due to a large enough number of coin flips. Convergence in probabilities is a relatively large academic area and fortunately we don’t need to delve into it here. But for most things in baseball, you don’t actually get enough coin flips to see this happen. Season limits are very strict.

What does this have to do with projections? This fluctuating data becomes a source of future predictions, and one of the things that is done in projections is to find things that are not only as predictive as normal stats, but also more predictive based on the appearance of fewer plates or speculators that you encounter. Imagine, for example, if your BMI was a great indicator of isolated strength. It will be very useful, as the changes to it over the course of the season are bound to be rather small. The underlying causes of performance tend to be more stable than outcomes, which is why ERA is more volatile than strike rate, and why strike rate is more volatile than panel discipline statistics that lead to strike rate.

MLB’s own method comes with x before the stats, while what ZiPS uses internally has z. (I’ll let you guess what it stands for!) I’ve written more about this stuff in various other places (like here and here), so let’s get straight to the data for the first two months of the Major League season. We’ve posted our leaderboards for hitters yesterday, so let’s finish with today’s bowlers, starting with their home run overruns:

Apparently zHR only buys Jose Quintana by letting him run twice at home in his comeback pirate season. While he has a solid average exit speed, he runs a very accurate streak with the fast ball low 90s and makes an accidental foul. This year, most of those bugs stayed in the garden. Of the 10 balls hit against him this year with an xSLG rating above 2.000, only four were hits, with only one ending in a circular shot. These will not continue to go into the deepest parts of the garden. On an average HR basis, AJ Minter stands out as the biggest overachiever, at 13.7% per barrel, not a single net hummer.

What about the retarded?

I have to wonder if Hunter Green’s presence here is a byproduct of his inexperience as a junior, as a result of a lot of time lost due to injury. Fifteen Reptiles is too much for a bowler with his stuff, and he doesn’t generally get hit hard. If anything, these numbers are similar to those of 2019’s top HR hitter Corbin Burnes, who confounded zHR with 17 people in just 49 rounds. ZiPS has not bought into those numbers when it comes to Burnes, and when it comes to future prospects, ZiPS will be very forgiving of Greene.

Shane McClanahan is almost greedy here considering he’s fifth in baseball for bowler Warr. Like Luis Castillo last year at a similar point in the season, German Marquez has fared well below his recent history while for him zStats sees little actual change in his career. How He pitched. Coors is always an issue of course, but I would definitely be interested to know if someone would be willing to sell Marquis for a low price in my fantasy league.

Now let’s take a look at rate bots and fanatics:

Don’t be alarmed by Burns’ score at the top of the list. Yes, his gait rate is much lower than you would expect from various board discipline stats, especially a very disappointing first stroke ratio, which is a strong leading indicator of his future gait rate. But that doesn’t mean there’s an actual problem here, because Burns has a history of improving their predicted walking rate, something ZiPS knows when they drool over their digits when performing a projection. Interestingly at least he was demonstrating a repeatable skill of being rarely allowed to walk despite having more than 1 to 0 counts of the average archer. Among the board’s discipline stats, the out-of-area swing ratio is also a key indicator, and some of the names here, like Bryan Baker and Seth Lugo, are also at the bottom of the league in this number. I’m particularly concerned about Lugo, because this is a huge turnaround.

Now defaulters:

Dylan Cease has been walking a bit lately, giving away 10 free passes in June. Now, he was the victim of one of the most horrible calls you could ever see, but he can’t blame her All From the rate of walking on it! Given his speed, call rates, and the rate at which hitters mistakenly assume it’s a good idea to chase his hinge curve, I wouldn’t worry, at least not yet. Meryl Kelly appears here and at home DuringList achievements to the point where they cancel each other out. ZiPS certainly hopes the Braves won’t use Spencer Strider’s gait rate as a reason to move him to shorter intervals; Despite the rather low first hit ratio, Strider’s contact/swing numbers convinced the computer that many of the board’s appearances had to be resolved before the fourth ball.

And now for the strike rate more than others and those with poor achievement.

zSO Overachievers

Noun So% So zSO% zSO zSO% difference zSO . teams
Nestor Cortes 28.6% 71 21.8% 54.1 6.8% 16.9
Ronnie Garcia 30.0% 33 17.8% 19.6 12.2% 13.4
Christian Jaffer 30.4% 56 23.7% 43.6 6.8% 12.4
Frankie Montas 27.9% 78 23.5% 65.7 4.4% 12.3
Austin Jumper 17.9% 40 12.6% 28.1 5.3% 11.9
Aaron Nola 29.3% 85 25.2% 73.1 4.1% 11.9
Justin Verlander 27.0% 73 22.7% 61.4 4.3% 11.6
Mackenzie Gor 30.0% 57 24.5% 46.6 5.5% 10.4
Eric Lauer 27.7% 65 23.4% 55.0 4.2% 10.0
Joan Adon 16.5% 44 13.1% 34.9 3.4% 9.1
Yossi Kikuchi 25.1% 52 20.8% 43.0 4.3% 9.0
Carlos Rodon 30.2% 75 26.6% 66.1 3.6% 8.9
Eli Morgan 35.1% 34 25.9% 25.2 9.1% 8.8
Robert Suarez 30.9% 29 21.5% 20.2 9.4% 8.8
Emmanuel Class 29.7% 27 20.2% 18.3 9.5% 8.7

Clearly, ZiPS hasn’t bought into the entire Nestor Curtis story yet. For a bowler who doesn’t throw hard at all and is very casual about getting hitters to swing across the throw, he has plenty of hits. However, ZiPS would have taken a while to believe Tom Glavine as well, so there is definitely a lot of hope here. Ronnie Garcia is the biggest strike average in baseball, as a result of his mediocre contact rates. Thirteen “extra” hits in 28 rounds is a massive number. While I think there is a real chance Cortes could continue to outsell his expected hits, García’s history of being able to maintain good hit rates is much shorter; He has a lower strike rate in juniors than in majors.

And finally, defaulters:

Interesting to see Noah Sendergaard on the trainee list. He looked relatively mediocre by his standards when I saw him play this year, but it’s hard to take all prejudices off when you know he’s missing a lot of his normal pace and already has a very low hitter. I wonder if he’s still trying to figure out how to eliminate hitters with so much of his power gone. Hitters hit it 0.262 against him at 0-2, which is barely a quarter of the hitters he has led 0-2 against (11 of 43, or 25.6%). Just to put 25.6% into context, he’s hit 51.2% this season. Dany Jiménez might be the most interesting inclusion on this list. His call rate of about 65% is elite, thanks to hitters who are constantly fooled by the curve. You obviously wouldn’t expect him to match up perfectly with nearly 15k/9 minors last year, but ZiPS sees a lot of hits here.

Leave a Reply

Your email address will not be published.