A good way to get smart people to mock you on the internet is to make a big deal about small sample defensive metrics. There are actually a lot things for which people on the internet will mock you, but that’s definitely one of them. For instance, imagine someone told you that Kevin Pillar is the best defender in baseball because his 2016 UZR/150 is 41.3! That assertion would earn some ridicule because a center fielder with a true talent 41.3 UZR/150 would essentially be some kind of baseball magnet positioned behind second base, and I’m given to understand those violate rules 3.09 and 3.10.

Just pointing to a defender’s metrics, be it UZR or DRS, isn’t enough to win an argument. Pillar has a reputation as a great defender, but no one honestly thinks he’s 40 runs better than the average center fielder. At best, that number suggests that Pillar has made great plays at an unsustainable rate, and at worst, it shows that the metrics are imperfectly designed tools that use imperfect data.

In 2015, Pillar accumulated 14 DRS in center (1,236 innings) and 8 DRS in left (120 innings) to go along with his 14.0 UZR in center and 1.5 UZR in left. Over his most recent full season, he was an elite defender; during the first 66 games of 2016 he’s been even better. Pillar currently owns 11 DRS and a 15.4 UZR (all in center). We all acknowledge those estimates are noisy and the precise run values needn’t be taken at face value, but the underlying message is probably right: Kevin Pillar is playing outstanding defense.

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Like any baseball stat, Wins Above Replacement provides the answer to a question. The question, in this case? Something like this: accounting for all the main ways (hitting, running, defense, etc.) in which a player can produce value for his team, how many wins has this particular player been worth?

There are, of course, criticisms of WAR. Some valid, others less so. One prominent criticism is how defensive value is handled in WAR. Some don’t understand how it’s calculated. Others understand but also question how well it represents a player’s defensive contributions. These criticisms shouldn’t be dismissed. As with all baseball statistics, though, it’s necessary to consider WAR in the context in which it’s presented — that is, to remember the question a metric is intended to answer and the method by which it attempts to answer that question.

On Monday, I completed one such reminder in a discussion of players whose WAR totals this year are probably low based on what we know about their defense. Today, I’ll make another attempt — this time, by examining players whose WAR totals are probably inflated by defensive numbers unlikely to be sustained over the course of a season.

In the comments of Monday’s post, one reader, Ernie Camacho, noted:

[T]here is a weird tension in this article between quantifying and estimating what has already happened, on the one hand, and evaluating player talent, on the other. I’m not sure we should be blending the two.

This is a good point. That tension most definitely exists, and it’s possible that some of that tension is what causes people to discount defensive metrics — and WAR as a whole. I agree that, in terms of calculating WAR, we should not be blending what has already happened with what we think will probably happen. Over time, in an ideal world, WAR captures both. In smaller samples, however, this is more difficult to do. In fact, there’s actually something that does capture the blending when we have smaller samples: projections. If we want to capture a player’s talent level at any given moment, projections do that very well.

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We often treat knuckleball pitchers as if they were members of some long-forgotten sect, practicing their secret ninjutsu on the rest of the league with a pitch that defies gravity and cannot be classified. That’s fine, the knuckler is the rarest pitch in baseball, and it has its iconic moments. Let’s not begrudge anyone a little fun.

But once you peal back the layers on the pitch, you start to see that each truism about the knuckler isn’t necessarily true. In fact, there are probably more ways in which the art of throwing a knuckleball is similar to the art of throwing other pitches than it is different. At least, that is, in terms of strategy and outcomes. Mechanics are obviously a different story.

Let’s unpack some of the things we might hear about knuckleballs, and then us the data and the words of R.A. Dickey and Steven Wright to guide our analysis.

Velocity doesn’t matter.

Maybe this isn’t a thing that’s said a ton, but nobody breathlessly reports knuckleball velocity readings the way they do fastball readings, so at least implicitly we’ve decided that speed doesn’t matter as much with the floating butterfly.

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Jose Altuve has 18 steals in 19 attempts this season. No, that’s not the bizarre stat. That’s just an impressive stat. Jose Altuve is an excellent base-stealer! Among the 71 players with at least five steal attempts this year, Altuve’s success rate ranks third. Since he began receiving regular playing time in 2012, no one’s stolen more bases. He’s fast, he steals plenty of bases, and he steals them well. Which is what makes the bizarre stat so bizarre, and here it comes: despite being fast, stealing plenty of bases, and stealing those bases well, Jose Altuve has been a terribly costly base-runner.

It’s easy to assume that good base-stealers are also good base-runners. The best base-stealers, typically, are the fastest guys on the field, and the best base-runners, typically, are those same fastest guys on the field. But if you think about it, aside from simply being fast (which isn’t necessarily a requirement for proficiency in either skill), base-stealing and base-running really aren’t as similar as they might appear. Base-stealing is more about pattern recognition, acceleration, and timing. Base-running has more to do with risk/reward decision-making, fluidity, and instincts. A base-stealer runs in a straight line with a defined endpoint. A base-runner runs in angles. Speed and athleticism is all that really ties these skills together.

Altuve has the speed and athleticism. That’s for sure. But when it comes to his base-running company, he’s the only one:

Look at that list of names. Look at it! It’s literally a list of nine old dudes whom way too many baseball fans believe they could beat in a footrace, and then Jose Altuve, one of the best base-stealers in the world.

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Devised originally in response to a challenge issued by sabermetric nobleman Rob Neyer, and expanded at the request of nobody, NERD scores represent an attempt to summarize in one number (and on a scale of 0-10) the likely aesthetic appeal or watchability, for the learned fan, of a player or team or game. Read more about the components of and formulae for NERD scores here.

Most Highly Rated Game
Baltimore at Boston | 19:10 ET
Gausman (60.0 IP, 93 xFIP-) vs. Wright (82.0 IP, 101 xFIP-)
At one point, Tyler Wilson was listed as Baltimore’s starting pitcher for this game. Now, he’s not. Now, Kevin Gausman is. The future outcome of this contest is likely different for it: Gausman has been more successful than Wilson in ways that suggest he’ll continue being more successful. As for the effect on the world, this is less clear. If a butterfly flaps its wings in Brazil, it sets off a tornado in Texas. If Kevin Gausman starts against the Red Sox instead of Tyler Wilson… one doesn’t know. That said, if the state of Texas experiences a particularly fraught week of violent storms, there’s likely to be finger-pointing in the direction of a certain Orioles right-hander.

Readers’ Preferred Broadcast: Baltimore Television or Boston Radio.

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Imagine you’re magically granted the power of time travel and that you use it to visit the days leading up to Opening Day 2016. Suddenly back in a world without daily regular-season baseball, you approach an unsuspecting baseball fan and tell them that you’re a time traveler with this bit of baseball information from mid-June: over the past 30 days, the Nationals have had the best offense in the National League.

The fan, presumably, would begin by chastising you for having wasted the gift of time travel on something so frivolous. Then, after gathering him- or herself, would likely respond with something like, “That Bryce Harper sure can rake, can’t he?” With the trap successfully set, you would then drop this bomb on them: “… and Bryce Harper posted a 77 wRC+ over those 30 days!”

Good job, time traveler. You successfully terrified an innocent person about the future without mentioning the name Donald Trump or Hillary Clinton. But we seasoned veterans of the 2016 season are able to accept those facts as true. Over the past 30 days, Bryce Harper (.289 wOBA) and Ben Revere (.287 wOBA) have been equivalently awful for the Nationals and, yet, the team is on an offensive tear. As you might expect, it’s been necessary for a lot of different players to perform well in order to make up for Harper’s lack of production – Wilson Ramos and Daniel Murphy have hit well all season while Danny Espinosa and Jayson Werth have recently turned their early season struggles around – but the biggest contributor for the Nationals at the plate of late has been Anthony Rendon.

Through May 9th, Rendon had hit a dismal .211/.289/.297, a line which amounted to offensive production nearly 40% below league average. Coming off a disappointing and injury-plagued 2015 season, it was natural to start wondering whether the 2014 season which led to him finishing fifth place in MVP voting was a flash in the pan never to be seen again. But then, Rendon started hitting. He entered play last night with a .324/.411/.546 line since the cherry-picked date of May 9th. This offensive outburst has raised his full-season wRC+ to a perfectly respectable 107.

Although the May 9th dividing line is arbitrary, it does come close to splitting his season in half, with 142 of his plate appearance coming before this magical date and 128 coming after. Let’s keep using this convenient dividing line to help us take a look at a key change in Rendon’s approach — one which may help explain his recent offensive outburst.

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There’s a funny thing about this line of work. We have access to information, so much information, an increasing amount of information, and it allows us to break down almost every single aspect of player performance. Want to know how a pitcher’s fastball has moved? Easy. Want to know where a batter hits groundballs against sliders? No problem. Interested in where outfielders are positioned with a lefty spray hitter at the plate? That’s becoming possible. So much is possible. An incredible amount is possible. Yet we still don’t know anything about what’s most important. If a player is locked in, he stands a chance. If he’s preoccupied, because, say, he got in an argument, or he thinks he left the oven on, he’s probably going to struggle, for no visible reason. You’re worse at what you do when you’re distracted, or when you’re frustrated. There aren’t any numbers for that.

Michael Conforto is in a slump. It’s a bad one, too, and Conforto feels it, and it happens to be taking place when the Mets are somewhat desperate for offense. That doesn’t help the stress, and maybe stress is the real problem. In baseball terms, he could be pressing. There’s no way for us to analyze that. What we can say for sure: In April, Conforto was the second-most productive hitter in the game. Granted, he was behind only Aledmys Diaz, so, April is weird. But since then, the wRC+ has dropped to 42. He’s struck out almost a third of the time. He’s chasing. The Mets don’t think it’s anything mechanical, and they’re prepared to let Conforto play out of this. I assume, at some point, he will. That doesn’t help the slump today. Conforto still feels the weight of his responsibility.

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Ben and Sam banter about a wide range of topics, including Ray Searage and the struggling Pirates pitching staff; the pitcher home run derby; rehabilitating Ben Cherington; the amazing Matt Shoemaker; Clayton Kershaw; crowd chants, and a bad fun fact.

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