A bevy of trades went down over the weekend, as this year’s trade deadline-season entered into full swing. Here are the prospects who changed teams the last couple of days, as evaluated by my newly updated KATOH system. KATOH denotes WAR forecast for first six years of player’s major-league career. KATOH+ uses similar methodology with consideration also for Baseball America’s rankings.

The Andrew Miller Trade

Clint Frazier, OF, New York (AL)

KATOH: 2.7 WAR
KATOH+: 4.7 WAR

Frazier had been promoted to Triple-A a week ago after slashing a strong .276/.356/.469 with 13 steals at Double-A this year. He pairs a high walk rate with decent power and speed, making him one of the most promising offensive prospects in baseball. Despite possessing average speed, Frazier plays mostly the corner-outfield spots these days, and hasn’t graded out particularly well there defensively. This suggests most of his big-league value will come from his hitting. Still, considering he’s a 21-year-old who’s already mastered Double-A, his future looks bright.

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Look, I know why you’re here. You want to read about deadline trades, and, more specifically, you want to read about impactful deadline trades. This is a post about the A’s trading Billy Burns to the Royals in exchange for Brett Eibner. I know exactly what we’re dealing with, so I won’t take up too much of your time. I’ll just leave some information and get out of here.

Why might the Royals like Burns? He’s under team control forever, he makes a ton of contact, he’s fast, and he’s a proven center fielder. Pretty solid foundation, all things considered. Why might the A’s like Eibner? He’s under team control forever, he has some power, he’s not unathletic, and he’s mostly played center in the minors. I’m not going to say this trade fell along party lines, since neither the Royals nor the A’s are actually caricatures of real front offices, but Burns and Eibner are probably both now in friendlier homes.

Burns is the one with the big-league track record. What’s interesting — last year he was a league-average hitter, and this year his wRC+ has gone down by literally half. Yet his overall profile has been pretty similar. He puts the ball in play, and he runs. Last year there were better outcomes. I want to show you something somewhat discouraging. In this plot are all the hitters who have batted at least 500 times over the past three calendar years. I’ve plotted them by pop-up rate and rate of home runs per fly ball:

For Burns, that’s bad. In the sample, he has the game’s highest pop-up rate, but one of the game’s lowest rates of homers per fly. It’s not just a product of playing in Oakland, either, based on his splits. Billy Burns hasn’t shown good enough bat control, and with these balls in play it would be tremendously difficult for him to produce at all, long-term. Another point that isn’t exactly in his favor: here are the five lowest hard-hit rates from the sample.

• Billy Burns, 12.9% hard-hit rate
• Andrew Romine, 16.6%
• Jarrod Dyson, 16.7%
• Ichiro Suzuki, 16.8%
• Jose Iglesias, 17.2%

Burns isn’t just in last — he’s in last by a few percentage points, which is a bad look. He simply doesn’t hit the baseball very hard. Borrowing from Baseball Savant: last year, in average exit velocity on flies and liners, Burns was tied for fourth-lowest. This year, he’s second-lowest. He doesn’t hit the ball hard, so he doesn’t flash much power, and because he doesn’t flash much power, pitchers challenge him, so he’s mostly unable to draw walks. He’s a ball-in-play sort, and that can make it hard to succeed.

But! It’s not impossible. Last year happened. Dee Gordon put together two productive years. Burns has a career wRC+ of 85, which makes him a lot like Dyson, his new teammate. Dyson might be the superior defender, but Burns is versatile, and he runs the bases well. Dyson isn’t controlled for too much longer; Burns is controlled for a while. Maybe he’s just a useful fourth outfielder, but he shouldn’t be useless, assuming he’s a better hitter than his 2016 statistics.

With Eibner, the A’s are betting on a bat. That he’s manned center in the minors shows he’s got some defensive skill, but mostly, his appeal is the consecutive productive years in Triple-A. He’s already 27, so he’s almost a Quadruple-A player, yet many believe those don’t exist. Count the A’s among them. In the high minors, Eibner has shown some discipline without having big contact problems. And, over a brief spell this year in the majors, Eibner ranked in the 85th percentile in average exit velocity on flies and liners. The pop in his bat is real. He just needs to be able to translate his eye. If he does that, he’s already an average player.

It’s an unsexy move, made between two teams currently going nowhere. A couple days from now, no one’s going to remember this ever happened. Every trade, though, is interesting if you dig into it. Here we have the Royals betting on athleticism, and the A’s betting on results. Sounds like the Royals. Sounds like the A’s.

Josh Reddick is the near-ideal trade candidate. He’ll be a free agent at the end of the season, he’s continued to hit ever since rebounding from a disappointing 2013 campaign, and he’s playing for a team in the Oakland Athletics that’s eight games under .500 and has virtually no chance at the playoffs. Reddick is headed to free agency in market populated by few decent players, suggesting there’s little expectation of a return to the A’s, a small-market club relying on young players to compete. All that said, there’s a case to be made that the A’s need not move Reddick at the deadline if they fail to receive a solid offer.

The market for corner outfielders hasn’t been great for sellers or free agents over the past year. A year ago, minor deals were made for Shane Victorino, David DeJesus, David Murphy, and Gerardo Parra. Yoenis Cespedes netted a good package for the Detroit Tigers headlined by Michael Fulmer, and even Cespedes was brought in to play center field. Jay Bruce, on a selling Reds team, stayed put. Carlos Gonzalez, on the selling Colorado Rockies, stayed put. Justin Upton, despite pending free agency, stayed put with the Padres. The latter three players were all producing offensively, but the Padres opted to take a draft pick for Upton, while the Rockies and Reds decided to hold on to their outfielders to try and get better value later.

Then, last offseason, the Rockies and Reds still couldn’t find any offers to their liking. As a result, the Rockies opted to trade the younger, cheaper Corey Dickerson to the Tampa Bay Rays for reliever Jake McGee. Jason Heyward got paid as did Justin Upton, but Cespedes ended up with an unusual three-year deal despite an MVP-type season. Alex Gordon did fine to get four years and $72 million — and Gerardo Parra was fortunate to get a three-year deal from the Rockies — but Dexter Fowler and Austin Jackson both had to sign one-year deals, while Colby Rasmus avoided the market altogether by accepting the qualifying offer. The FanGraphs crowdsourced guesses overshot it on almost all of the outfielders.

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Trade-deadline hysteria can lead to a dehumanization of players. In our effort to feverishly re-imagine our favorite team’s roster, all of us can be guilty of rooting to exchange this piece for that piece without considering all of the havoc that a trade can create for the people concerned.

I don’t mean to be a wet blanket. It’s fun to dream on that big acquisition that will put our teams over the top, and let’s please continue to do so.

But! We can also appreciate how difficult it must be to weather the constant speculation about your status, and then, if the trade is consummated, to then figure out how to move your life to another city — quickly.

So David Laurila and I set out to ask players about the experience. How did they find out? What were the conversations with the family like? What was the emotional roller coaster like? Thanks to the players that opened up, we can get a better sense of the human side of the trade deadline.

*****

Jeff Samardzija, Giants starting pitcher: “The first time, I watched all the rumors, and it ended up being Oakland, which wasn’t even on the radar, anywhere. The second time around I just ignored it all, and then I almost went to the White Sox and it fell through, and then a few days later it actually happened. Following for entertainment purposes is kinda fun.

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If you’ve been following baseball over the last several seasons, you likely know at least two things about Jed Lowrie. The first is that he’s had some trouble staying on the field for a full season during his career; the second, that he wears a two-flap helmet in a league of men who insist they only need one. A slightly more dedicated fan could probably tell you that Lowrie has played for the Red Sox, Astros, and A’s during his tenure and would probably describe his performance as “fine.”

In his earlier days, Lowrie showed promise as a hitter. More recently, though, he’s settled in as something slightly below league average at the plate. His defense is something of a controversy, with Defensive Runs Saved (DRS) considering him to be a rather poor middle infielder and Ultimate Zone Rating (UZR) viewing his defense as something much closer to average. The collective eye test probably places him closer to his DRS than his UZR numbers, but there’s plenty of human disagreement as well.

This introduction, perhaps on purpose, paints Lowrie as exactly the kind of player who doesn’t get a lot of attention. Relative to his peers, Lowrie almost seems boring. Yet there’s a case to be made that he’s having one of the most interesting seasons of anyone in baseball.

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You’ve seen Daniel Mengden pitch, right? If you haven’t, you have to. First of all, it looks like this.

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Ever since Eric Byrnes used a computer to help umpire an independent-league baseball game last year, and then Brian Kenny took up the mantle of #RobotUmpsNow on the MLB Network, I’ve been fascinated with the idea that robot umpires will soon call strike zones in baseball. The more I talk to players about it, though, the more I doubt that it’s an eventuality. Because the players, well, the players are going to hate it.

I can’t speak for all players, obviously. I haven’t talked to all of them. But I’ve talked to plenty on both sides, even ones I can’t quote here, and the biggest endorsement I could get was a tepid version of “It’s going to happen.”

So instead of asking each player what they thought about robot umpires, I changed the question a bit. Instead, I asked pitchers, catchers, and hitters, “Who will hate robot umps the most?”

The short answer? Everyone. The long answer? Much more interesting.

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First, Marcus Semien worked hard, every day, with Ron Washington and various tools of the trade in order to improve his defense. He’s now an above-average defender, if you believe the stats — or at least a competent defender, if you prefer your eyes.

The newest evidence of his behind-the-scenes toil comes from his production at the plate. If you look at his overall line, a little bit more patience and power has pushed his weighted, park- and league-adjusted offense up about 10 percentage points. If you look at his overall peripherals, even, it doesn’t look like much has changed. He’s pulling a bit more, but he’s hitting about the same mix of grounders and flies.

You might just chalk it up to getting a little bigger, and picking his pitches a bit better. But if you did that, you’d miss that there’s been a rapid and drastic change to his batted-ball mix this season. It’s almost a tale of two seasons.

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Atlanta’s ace, Julio Teheran, has a career 3.34 ERA, a good mark even for this pitching-friendly era. This year’s numbers, at least in some ways, are the best of his career. He’s a 25-year-old with less than $30 million in guaranteed money remaining on his contract, which runs through 2020 if you count the low-cost team option for that season. If the Braves make him available before the deadline, he’d instantly become one of the most valuable assets on the market.

But is Teheran an ace, like the Braves are likely to price him? Or is he more of a good pitcher on a nice run? Since assuming regular major-league duties in 2013, he’s 44th in pitching Wins Above Replacement despite being 11th in innings pitched, as he’s accrued value by staying healthy and racking up innings, but not dominating in the traditional walk, strikeout, and home run categories.

But this year, once again, Teheran is dealing, and he’s doing so without strikeout, walk, or home-run rates that would appear on the first page of each leaderboard. For teams hoping to acquire the Braves ace, they’ve got to be wondering who he will be on their team; the guy who looks great by ERA or the guy who looks like an innings-eater by FIP?

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Heading into the season, the Mets plan to repeat as National League champions seemed pretty obvious; they were going to beat their opponents with elite starting pitching and an above average offense, hoping those strengths would outweigh their defensive deficiencies and a just-okay bullpen. It was a solid enough plan, and based on their depth chart on Opening Day, we gave them a 51% chance to win the division and a 78% chance to make the postseason. And mostly, those things have played out as expected. The rotation has been fantastic, ranking second best in baseball to this point. The bullpen has been fine, with occasional lapses. The defense has been bad.

But one part of the formula hasn’t really gone according to plan yet; that productive offense hasn’t really come to fruition. To this point, the offense has been a little bit below average, ranking right in the middle of the pack in wRC+ while costing themselves some runs with relatively poor baserunning. And on top of that, the team has distributed their hits in a highly inefficient way, so despite an expected 4.2 runs per game based on their BaseRuns inputs, they are only scoring 3.7 runs per game, third-worst in the majors.

Certainly, health has been part of the problem. First, Travis d’Arnaud went on the DL at the end of April. Then in May, it was Wilmer Flores and and Lucas Duda. June brought David Wright’s DL stint, and more recently, news that he’ll require back surgery that may sideline him for the rest of the season. The infield has ended up as a patchwork group, and with Michael Conforto and Alejandro de Aza not hitting as well as expected, the outfield hasn’t been able to carry the load. And so now, the team is openly talking about making more additions, and not waiting until the trade deadline to do so.

“I think we might need to do something before,” Wilpon said Monday at the Harlem RBI fundraiser in Manhattan. “The deadline is still four, six weeks away. We’ve got to start playing better baseball now.”

Thankfully for the Mets, identifying a potential spot to upgrade is pretty easy. They’re not going to add an outfielder, most likely, given that group is already crowded, and Conforto and de Aza can both be expected to improve in the second half. Neil Walker has been good at second base, and Asdrubal Cabrera is a good enough player at shortstop to not require a replacement. So, the team is left with just the corner infield spots or behind the plate if they want to upgrade the offense.

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