One of the more fascinating rollouts from Baseball Savant this season has been xwOBA, a metric that utilizes launch angle and exit velocity to assign a hit value (single, double, triple, home run, or out) to every batted ball and then translates the results to “expected” wOBA. Why does it matter? By stripping out the influence of luck and defense, it gets closer to something like a “deserved” hitting number.

Here’s what the glossary at MLB.com says about the metric:

xwOBA is more indicative of a player’s skill than regular wOBA, as xwOBA removes defense from the equation. Hitters, and likewise pitchers, are able to influence exit velocity and launch angle but have no control over what happens to a batted ball once it is put into play.

For instance, Tigers first baseman Miguel Cabrera produced a .399 wOBA in 2016. But based on the quality of his contact, his xwOBA was .459.

For the most part, those claims make sense. But that’s not to say xwOBA can’t be beaten. To understand how, let’s look a little bit at how wOBA compares to xwOBA. Let’s begin by looking at all players from last season who recorded at least 400 at bats and compared their wOBAs to their xwOBAs. The scatter plot looks like this.

There’s a pretty strong relationship there. Of the 183 players represented above, 150 had a disparity between wOBA and xwOBA under 30 points. That seems pretty conclusive.

So what are we to do with this data? We could look at the outliers on either end, presume that they were either unlucky or lucky when it came to batted balls, and then move on with the analysis. However, before we do that, we might want to look at other reasons for the potential disparity. To that end, I did an eye test of sorts. I took all players with at least 400 at bats in both 2015 and 2016 and looked at their xwOBA minus wOBA in both seasons. If a player had a negative number, he might be considered to have had some good luck. If the numbers were positive, he might have had some bad luck.

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Let’s take a look at the standings, shall we? The Diamondbacks are presently sitting in…okay, third place. But while they might be third place in the National League West, they’re also fifth place in the National League, overall, meaning they occupy a playoff spot. In other words, it’s been more of a good start than a bad one. And an encouraging start, given the organizational shake-up between years.

If you’ll remember, coming into the season, the Diamondbacks were defined by what you could call an intriguing post-hype pitching staff. It stood to reason that, if it was going to be a good year, they’d need those pitchers to deliver on the promise they’d had before. And, wouldn’t you know it, but according to the leaderboards, the Diamondbacks are fifth in baseball in pitching-staff WAR. They’re first among starting rotations. The effectiveness has been there, even despite Shelby Miller’s injury.

About that! Miller’s absence opened up a spot. One turn was given to Braden Shipley. The other three turns have gone to Zack Godley. Over three starts and 18.2 innings, Godley’s got 19 strikeouts, with four runs allowed. It’s not so much that Godley has been unhittable. It’s that he’s been good, and better than before. Godley, who’s never been a Baseball America top-10 organizational prospect. There’s a new exciting pitcher on the staff.

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A couple of weeks ago, I looked at the 10 hitting prospects who had most improved their KATOH+ projections over the season’s first few weeks. Now that we have a more meaningful sample of games to analyze and a new Baseball America top-100 list baked in, I’m repeating that exercise. It’s still early in the season, but not too early to start identifying players who are performing better than they have in the past. A reminder: a player’s KATOH forecast denotes his projected WAR total over the first six seasons of his major-league career.

Juan Soto, OF, Washington (Profile)

Preseason KATOH+ Projection: 4.0
Current KATOH+ Projection: 11.2

Soto topped this list two weeks ago and has only built on that performance since, though he’s sidelined with an ankle injury for now. His line now sits at .360/.427/.523. Baseball America also recognized Soto’s excellence by ranking him No. 59 on their updated top-100, which also nudges up his projection. Soto possesses a rare combination of power and contact skills and is very young for his level.

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You probably don’t need much of an introduction to Kyle Schwarber. His story has been told numerous times, and he gained legendary status through his late-season return from ACL surgery, hitting .412 in the World Series to help the Cubs end their 108-year World Series drought. Schwarber is probably one of the most well known young players in baseball.

Depending on how frequently you read FanGraphs, you may be aware of Aaron Altherr. Jeff wrote about him in March when he was having a strong spring, trying to earn more time than his slotted 4th outfielder job on the Phillies would give him, and I wrote about his breakout performance last week. But while Altherr has gotten some notice for his strong performance the last few weeks, he’s still a relatively obscure young outfielder.

But despite their significantly different levels of recognition, they may be more similar than their reputations would suggest. So today, I wanted to do something of a thought experiment, and gauge how our readership sees the pair, as of May 16th, 2017.

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Hunter Renfroe had a huge game last night. The Padres outfielder hammered a two-run double in the second inning and followed with a two-run homer in the 10th. The latter was a walk-off, giving San Diego a 6-5 win over the Milwaukee Brewers. The blast was his seventh on the season, tying him with Josh Bell and Cody Bellinger for the lead among NL rookies.

Renfroe’s overall numbers aren’t great — his slash line is .217/.273/.406 — but he’s showing signs of breaking out. Over his last six games, the 25-year-old former first-round pick is 6-for-18, and four of those safeties have gone for extra bases. Every bit as notable is the fact that he’s drawn seven free passes. Selectivity has never been a strong suit for the slugger, but given his ability to propel baseballs long distances, a more-discerning eye could very well be his ticket to stardom.

There’s no questioning his raw power. The Mississippi State product left the yard 30 times last year for Triple-A El Paso while capturing Pacific Coast League MVP honors. He added four more dingers after a late-September call-up. Six of the 11 home runs Renfroe has hit in a big-league uniform have traveled over 400 feet.

Renfroe discussed his power-laden gap-to-gap approach, and his views on launch-angle data, prior to the start of the regular season.

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Renfroe on launch-angle data: “I’m obviously aware of it, but the ball is moving. It’s not sitting on a tee, so you can’t stand in the box and think about things like launch angle when the ball is coming at you 98 mph. You hit it, and whatever it does… you know? Hopefully you hit it on the barrel at a good angle, and it makes it over the fence, or at least goes for a double, or even a single.

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CLEVELAND – Miguel Sano knows what he wants.

In the visiting team quarters in Progressive Field, there’s a small kitchen — like something you might find in a World War II-era submarine — that offers players various pre- and post-game sustenance. On Sunday morning, Sano, apparently unsatisfied with the options, disappeared from the clubhouse and reappeared with rectangular aluminum carry-out pan containing mangú, a Dominican breakfast dish of mashed plantains topped with a type of thinly sliced sausage. He said he had procured it from a local restaurant. The 6-foot-4, 260-pound Sano is known as a popular teammate and this catering feat was a prime example. As he appeared with breakfast, several of his teammates, also of Dominican origin, huddled around a card table in the center of the clubhouse for a Sunday morning feast.

Sano is selective at the plate, too.

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Devised originally in response to a challenge issued by sabermetric forefather 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.

How are they calculated? Haphazardly, is how. An explanation of the components and formulae which produce these NERD scores is available here. All objections to the numbers here are almost certainly justified, on account of how this entire endeavor is absurd.

Most Highly Rated Game
Tampa Bay at Cleveland | 18:10 ET
Odorizzi (31.0 IP, 98 xFIP-) vs. Salazar (36.1 IP, 79 xFIP-)
Boston’s Chris Sale has recorded the top WAR among major-league pitchers by nearly a full win so far this year. Unfortunately, he isn’t pitching tonight. Who is pitching is Danny Salazar. Salazar hasn’t recorded the best or second-best or even fifth-best WAR among major-league pitchers. What he has done, though, is produce a better swinging-strike rate than both (a) Boston’s Chris Sale and also (b) all 95 other qualified pitchers. His changeup is mostly the reason. Salazar has registered a swing and miss on more than a quarter of the changeups he’s thrown this year.

Here are three examples of that changeup from Salazar’s most recent start:

Readers’ Preferred Broadcast: Cleveland or Tampa Bay Radio.

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