On Sunday, the Red Sox announced they were promoting top prospect Rafael Devers from Triple-A and inserting him as their starting third baseman, filling a spot that had been a pretty big problem for the team this year. Last night, Devers made his Major League debut in Seattle, drawing a pair of walks off of Felix Hernandez and Edwin Diaz. But while Devers was playing his first Major League game, the Red Sox acquired a guy who might end up taking his job.

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Happy Rafael Devers Day!

The highly-touted 20-year-old is slated to make his big-league debut tonight, and will almost certainly provide Boston with a sizable upgrade at the hot corner. Devers slashed .300/.369/.575 at Double-A before hitting a cool .400/.447/.600 in a nine-game stint at Triple-A.

Devers’ biggest strength is his power. After putting up middling power numbers in years past, he smacked 20 homers and 20 doubles in the minors this year. Unlike many power hitters, Devers doesn’t strike out a ton — he’s kept his strikeout rate below 20% throughout his time in the minors.

Devers has quite an exceptional offensive profile, but it’s even more impressive when you consider he’s much more than his hitting. Not only does Devers play one of the more premium defensive positions, but he plays it quite well. He’s been three runs above average at third base this year by Clay Davenport’s numbers, and checked in at +19 (!) runs last year in High-A. Devers’ high-minors performance has been excellent across the board, which is all sorts of encouraging coming from a 20-year-old.

My KATOH system pegs him Devers 11.7 WAR over his first six seasons by the stats-only method and 15.3 WAR by KATOH+, which incorporates his Baseball America ranking. Those marks place him sixth and fourth, respectively, among prospects.

To put some faces to Devers’ statistical profile, let’s generate some statistical comps. I calculated a Mahalanobis distance between Devers’ 2017 performance and every season since 1991. In the table below, you’ll find the 10 most similar seasons, ranked from most to least similar. The WAR totals refer to each player’s first six seasons in the major leagues. 

Please note that the Mahalanobis analysis is separate from KATOH. KATOH relies on macro-level trends, rather than comps. The fates of a few statistically similar players shouldn’t be used to draw sweeping conclusions about a prospect’s future. For this reason, I recommend using a player’s KATOH forecast to assess his future potential. The comps give us some interesting names that sometimes feel spot-on, but they’re mostly just there for fun.

Rafael Devers will be called up to the majors on Tuesday. Well, I suppose he may technically be called up today, but he’s not expected to start Monday’s game, so it might not be until Tuesday. Whatever day he’s officially promoted, he’ll become the first 20-year-old position player promoted to the majors this season. While Travis Sawchik has already discussed Devers in the context of the Red Sox’ situation, I’d like to look at him in the context of 20-year-old call-ups.

I went back to 1985 in pulling info for 20-year-old call-ups, and there are some interesting things to be shared. Let’s start at the beginning: Devers will become just the 78th player since 1985 to be called up to the majors for his debut as either an 18-, 19- or 20-year-old. Here’s a breakdown of all the relevant players:

(Note: You get one attempt to guess who the 18-year-old was. If you get it wrong, you must serve a self-imposed banishment from FanGraphs for a period of 10-10.5 hours.)

As you can see, the last three years have represented a bit of a dry spell for young call-ups. From 1985 to 1994, there were 26 call-ups. There were also 26 from 1995 to 2004 and 24 more from 2005 to -14. This season is far from over, obviously, but if this holds, it will become the lowest three-year total since ’85. The current lowest periods are 2014-2016 and 1999-2001, at five. Teams are either more cautious these days or front offices are experiencing less pressure to produce winners — which may be an inevitable result of teams purposefully tanking.

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Happy Trade Deadline Week, folks.

T minus 175 hours, roughly, until the non-waiver deadline horn sounds.

This period, of course, represents the last, best chance for contending clubs to add pieces and fill gaps — and for sellers to spin off remaining assets. Dave Cameron updated his buyer-seller status list last week and things remain fluid. Just since that update, the Brewers’ playoff odds have declined by roughly 20 percentage points to 10%, so there’s still quite a bit of uncertainty in places like the NL Central, which will add an element of drama to the period. Teams must first decide how much they are willing to bet on themselves.

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The Red Sox need a third baseman — at least, if they’re not going to give Rafael Devers a shot, like I think they should — and maybe some more relief help. This isn’t any kind of secret. Dave Dombrowski is even openly talking about it. And Todd Frazier, a walk-year player on a team trading everything that isn’t nailed down, was an obvious fit. He’d have been a fit if they wanted to keep the spot open for Devers, since he could have played some first base too, potentially giving them an upgrade over Mitch Moreland if Devers came up and mashed.

Like every other contender, they could also use another reliever or two. Their bullpen has been good so far, but also heavily worked, and no one every really has enough good bullpen arms. The White Sox were also selling good relievers, including a young controllable arm that Jeff just wrote up today. A deal between the two Sox franchises seemed like an obvious fit.

So, of course, the Yankees are apparently getting in the way, and according to reports, are closing on a deal for Frazier, David Robertson, and Tommy Kahnle.

Source confirms reports by @JonHeyman and @Joelsherman1: #Yankees gaining momentum toward trade for Robertson, Frazier and Kahnle. @MLB

— Jon Morosi (@jonmorosi) July 19, 2017

Chase Headley has been decent enough at third base that Frazier would probably play first base in New York, or at least give them options to run some platoons at the corner infield spots with Frazier bouncing between the two spots. But for New York, this is probably more about getting two more good arms for a bullpen that has been pretty lousy so far, and then keeping Frazier away from their division rival because why not?

Given what Ryan Madson and Sean Doolittle cost, I’d imagine this trio is going to fetch a decent return, depending on how much of Robertson’s salary the Yankees are picking up. If they’re absorbing all of the ~$18 million he’s owed through next season, that might lighten the package a bit, but Kahnle was likely going to cost a lot, given his dominance this season and remaining years of control. Odds are the Yankees simply outbid the Red Sox, and I wouldn’t be surprised if making sure the Red Sox didn’t get better easily was at least partly about the reason the Yankees got involved here.

Since the deal isn’t yet done, we don’t know what price New York is paying, but I certainly wouldn’t want to try and come back against this potential bullpen in October. Kahnle, Robertson, Dellin Betances, and Aroldis Chapman would be a pretty rough group to try and score off of.

Jay Groome recently found himself in the news for reasons not of his doing. Thirteen months ago, he was in the news for reasons that were: the 6-foot-6 left-hander was drafted 12th overall by the Red Sox out of a New Jersey high school. He could have gone even higher. As our own Eric Longenhagen wrote this spring, Groome was “arguably the most talented prospect in the 2016 draft.”

Given his age and experience level, it is very much raw talent. The 18-year-old southpaw has just 10 professional games under his belt, the last four of which have come with Low-A Greenville. Groome’s calling card is a curveball that Longenhagen called “potential plus-plus,” and his fastball has been clocked as high as 97 mph.

Groome talked about his nascent development — and his power repertoire — in late June.

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Groome on having a simple approach: “Everything I’ve learned — everything I know — comes from my father, or from myself, just trying to perfect my craft. I’ve always done what feels good for me and what looks good. I just throw all of my pitches.

“A couple of times on the showcase circuit they would have the Trackman, but I never paid attention to it. I’ve never looked into what my spin rate is, or anything like that. I’m not a big physics guy on how all that stuff translates to them hitting the ball or not hitting the ball. I just go out there and throw the ball and try to hit my spots; and if they hit it, they hit it, and if they don’t, they don’t.”

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Nearly a month ago, Dave Cameron opined that the Red Sox ought to cut ties with Pablo Sandoval. On Friday the Red Sox acquiesced.

Just two-and-a-half years into a five-year, $95-million deal, Sandoval was designated for assignment on Friday. In parts of three seasons in Boston, Sandoval produced three below-replacement-level marks, totaling -2.6 WAR. He’s owed about $49 million.

Dave noted many things on June 15, including Sandoval’s deterioration against left-handed pitching, but it’s interesting to note Sandoval is also a player quite effected by defensive shifts.

Wrote Dave:

In San Francisco, before every team started shifting on nearly every play, Sandoval was reasonably effective when hitting grounders, hitting .261 with a .282 SLG on GBs. Since arriving in Boston and having to adjust to life without the ability to pull the ball between the first and second baseman for a single, he’s hitting .188 with a .197 SLG. Without enough power to offset the GB-heavy batted ball profile, Sandoval is probably going to struggle to run a BABIP over .300 again.

If you’re looking for a silver lining here, if you’re looking for a reason to believe the Panda is not finished, Sandoval’s 96.2 mph average exit velocity on fly balls and line drives ranks 30th in the sport this season. But Sandoval posted the most extreme GB/FB ratios of his career in Boston — a 1.51 ratio in 2015 and a 1.68 mark this season — since his rookie year in San Francisco.

While Sandoval isn’t a slugger, he perhaps would have benefited from getting more balls off the ground.

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The overriding theme of the 2017 season to date has been a wave of homers, many of them hit into the stratosphere courtesy of the sport’s new wave of sluggers, like Cody Bellinger, Miguel Sano, and, of course, Aaron Judge. Somewhat under the radar, the game’s three best starting pitchers, Clayton Kershaw, Chris Sale, Max Scherzer and are doing what they always do — namely, dominate.

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I like when the analysis doesn’t have to get too low into the weeds. Yesterday, I wrote a little bit about the impressive Sean Newcomb. What makes Newcomb so impressive, at least for now? He’s throwing more strikes than he used to. In the minors, he had a strike problem. In the majors, he hasn’t had a strike problem. What could be simpler than that? Everybody knows what a strike is, and everybody understands how throwing more strikes is generally better for someone. I don’t know why Newcomb’s strikes have improved, but his mechanics look clean. So be it.

There are more than 200 pitchers who have thrown at least 500 pitches in the majors in each of the last two seasons. The biggest strike-rate improvement currently belongs to Craig Kimbrel. Behind him are Archie Bradley and Jimmy Nelson. They’ve all been terrific. Turning around, the biggest strike-rate decline currently belongs to Wade Miley, followed by Cole Hamels and David Price. Miley isn’t real good. Hamels had an injury. Price is our focus today. He’s long been a strike-thrower, up until now.

It’s interesting enough that Price has struggled to throw strikes for the first time in forever. Ditto pitches in the zone. There’s an obvious link between the two. But this doesn’t seem like just a regular story about a pitcher losing it. Price has only partially lost it.

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Daily notes on prospects from lead prospect analyst Eric Longenhagen. Read previous installments here.

Durin O’Linger, RHP, Boston
Level: Short Season Age: 23   Org Rank: NR   Top 100: NR
Line: 4 IP, 3 H, 2 BB, 1 R, 6 K

Notes
O’Linger isn’t exactly a prospect — his fastball sits in the 86-88 range and he’ll flash an average changeup — but of note due to his recent, historic postseason run at Davidson during which the senior threw 502 pitches over six appearances in a 16-day span. Rest was not a priority for O’Linger, who was so sure he had no future in pro baseball that he was set to attend the University of Florida’s pharmacy school in the fall. The 23-year-old is pitching with house money in the New York-Penn League right now.

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