Despite his below-average walk rate and high strikeout numbers, Ian Desmond’s power and speed have made up for his contact inadequacies during the past three years. He is, at once, an exciting and frustrating player to watch: a hitter prone to incredible dry spells followed by gluttonous power explosions. The Nationals have accepted his droughts — even going so far as to offer him a seven-year, $107 million dollar contract extension before the 2014 season — because the hot streaks were worth it.

Desmond has relied on that full combination of speed, low contact, and high power during the years since his breakout in 2012, and because of that, his skill set is a relatively tenuous one. We’ve seen players excel at a high level with those same type of skills, but the difference between productive and unproductive is closer when you rely on the ball going over the fence a certain number of times.

If we navigate to the batter leaderboards and sort by wRC+, Desmond has been the seventh-worst qualified offensive player in the majors this season. He’s been the very worst defensive shortstop. The nightmare scenario has come to fruition in Desmond’s walk year: a cratered home-run rate per fly ball (HR/FB), a walk rate dive, an almost total absence of speed, and really poor defense. The 2015 edition of Ian Desmond is now 2010 Desmond, except with more strikeouts and less on the base paths. Take a look:

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Every season is a great season of baseball. It’s fair to say, however, that some seasons might be better than others; if unexpected teams succeed, records are broken, and exciting rookies debut on the biggest stage, we can witness something that transcends the customary ebb and flow of the regular season. At the All-Star break, 2015 has done exactly that.

The Twins are in the playoff hunt. A-Rod reached 3,000 hits. And, despite those unexpected and landmark events, this season’s greatest surprise might be the group of up-and-coming superstars that have broken into the big leagues. With Miguel Sano getting the call to the Twins two weeks ago, we’re now seeing many of the big-name prospects that we’ve been hearing about for the past few years: Kris Bryant, Joc Pederson, Carlos Correa, and Addison Russell (just to name a few) are all in major league starting lineups on a daily basis.

All of these players were at one time in Baseball America’s top 10 prospects list; all at one point have topped their respective team’s individual lists. It’s unusual to see so many top prospects called up in the first half of the same season, and it warrants our attention. With a chance to pause and look back on the season thus far, how have 2015’s rookies measured up against the rookie classes of the past decade?

First, we’ll look at the overall pre-All Star break production of this season’s positional rookie class compared to those of the past decade. As a cutoff, we’ll look at the combined production of the top 20 rookies for each season; that will seek to isolate only the best rookies in each season. Let’s look at the first-half production of each rookie class by Wins Above Replacement since 2005. Is 2015 actually a great year for rookie production, compared to the past decade?

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If you’ve been paying attention to baseball during the past month, you probably know that J.D. Martinez has been on a pretty good run. That might be an understatement: he’s hit 15 home runs in the past 31 days, four more than the next-best mark (Albert Pujols). If home runs aren’t your thing, he’s also first in wRC+, wOBA, and ISO over that span. Martinez has been out of his mind recently, and he’s been out of his mind in an even more extreme way than we’re used to seeing from him.

Let’s start with a few names. Below is the complete list of right-handed hitters who have hit a home run to either center field or right field at Comerica Park this season:

• J.D. Martinez
• Miguel Cabrera
• Nick Castellanos
• Ryan Braun
• Avisail Garcia
• Tyler Flowers

It’s not an extensive list, because hitting home runs to those areas of Comerica Park is difficult if you’re right handed: the right-field fence is 11 feet tall once you get toward right center, and center field is, quite simply, where fly balls go to die. The names on this list have to possess a lot of raw power, obviously. Exhibit A, Martinez’ first hit of the season:

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For the past two years, there’s been a dark horse in the MVP race. Though he might never had a shot at winning the award with the likes of Miguel Cabrera and Mike Trout putting up the types of seasons they did, Josh Donaldson has nonetheless been one of the best players in baseball since the start of 2013. This year, we’re witnessing an interesting development: a plate approach adjustment to take advantage of the offense-friendly Rogers Centre.

We’ve gotten accustomed to seeing a high level of production out of Donaldson since August of 2012: above average walks, a lot of power and elite defense. His offensive output was tempered in 2013 and 2014 by the fact that he had to play his home games in pitcher-friendly Oakland; the prevailing thought was that moving to the Rogers Centre in 2015 could possibly vault him into an even higher echelon among power hitters.

At the midpoint of this season, that’s exactly what has happened. Take a look at Donaldson’s yearly stats since the start of 2013, the first year he was the productive hitter we see today:

A few things of note this season: Donaldson’s strikeouts are up, his walks are down a fair amount and his power is more substantial. We tend to see walk rates improve as players age, so this is a little strange. What could be causing his drop in free passes? Let’s look at Donaldson’s stats away from Rogers Centre this year:

His rate stats look in line with his career norms since 2013, but everything else has been pulled down in some part by bad batted-ball luck. How about his stats this year at Rogers Centre?

There we have it. Compared to his overall stats the past two years, he’s basically not walking, he’s striking out more and he’s hitting for much more power when he’s playing at home. What we seem to be seeing is a different approach when Donaldson is in Toronto — one that allows him to take advantage of his home park’s natural power-boosting tendencies. Let’s go into the reasons for the numbers.

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If you’re a Yankees fan, you probably know that Chris Young (the hitter) has been on a bit of a tear lately, forcing himself into the starting lineup on a daily basis. If you’re a general baseball fan, you also might know that Young is from Houston, Texas. How would you know a sort of random bit of information like that? Most likely because there are two known Chris Youngs, the hitter: Mr. Young the usually fringy outfielder, and Mr. Young when he’s playing in Houston.

The former Mr. Young we’ve known for some time. He had a ton of expectations put on him early in his career, a few momentary flashes of what could have been, then he’s bounced around in a fourth-ish outfielder role for a number of clubs in the past few years. He owns a career line that supports such a role:

A little power, a little speed, but not really enough there to merit full-time work. Young is almost 32 years old, so the ship sailed long ago on him becoming the guy people expected when he was called up. However, the main point: there’s a place on some major-league team for a guy like Chris Young, even if there barely is, and even if that role is limited in nature.

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Alex Rodriguez has had an interesting few years. Ok, so that’s a big understatement. Besides the controversies, the 3,000 hits, and the various arguments with management and professional baseball catchers, we’re now witnessing something most people didn’t expect: a 39-year-old A-Rod putting together an incredible offensive year. As he heads toward the final two years of his contract in New York, two questions arise: has Rodriguez been worth the incredible amount of money he’s received over the span of his current contract? And has he been worth the money he’s getting this year?

First, it’s important to establish just how great and anomalous Rodriguez has been this season for, well, how old he is. It is pretty well known that most offensive categories should have taken a serious hit by the time a slugger approaches 40, but A-Rod has bucked that trend — in fact, he’s been close to his former greatness, at least offensively.

We can measure his success this year in a number of ways: by simple numbers (his current 152 wRC+ is in line with some of his better previous seasons — he posted the same wRC+ in his stellar 2008 campaign), average batted-ball velocity (he’s top five in the league), and fly ball/home run distance. The short story: A-Rod is hitting the ball really hard, really far, and he’s even being pitched to like he’s a slugger in his prime.

Now that we’ve established how great he’s been this season, let’s talk about the contract, and free agent deals. We often hear about teams backending contracts. They do so because inflation will devalue the later years of a deal, and they might be able to deal the player to a team who will eat some of the contract later on. It’s the free agent version of kicking the can down the road: sign the player now, get the production, and deal with the hard decisions later.

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Depending on whom you ask, a really fun or terrible thing is happening this season: Alex Rodriguez has been better than anyone expected. Perhaps he’s been way better than anyone expected. Thirty-nine-year-olds in the post-PED era aren’t supposed to have these kinds of seasons. Also of note, however: Alex Rodriguez is getting paid a lot of money: $22 million in 2015, to be exact. So, in this very surprising year that 39-year-old A-Rod is having, the question now becomes: has he been worth that much money so far? And, in the bigger picture: which players have been the best value so far in 2015, and which have been the worst?

The conventional wisdom with the sort of contract that Rodriguez has — the savagely long, payroll-sucking kind — is that they are sort of a wash at the end. A team pays for the production up front, back ends the deal, and secretly hopes they can offload the aging slugger or pitcher to another team at some point toward the end, eating a little of the annual contract when doing so.

It happens all the time: Boston is still paying Manny Ramirez; the Mets are still paying Bobby Bonilla (I thought I was crazy, but yeah, they still are, and will be forever). Obviously, that makes it really hard for the players to live up to their end of the deal in the final years, even though they aren’t complaining. We’ll get to A-Rod a little later, but for now, let’s look at the rest of the league.

For ease during this exercise, we’ll use the standard offseason free-agent value of a win — about $7.5 million. We can debate this figure, but it’s what we have, and we’re going to roll with it. Dave did great work in the past on the very issue of how much a win costs. We’ll then use that figure to discern how many wins a team is paying the player for at this point in the season (salary wins), and compare that to how many wins they’ve actually produced (WAR), to get surplus wins. We’ll use both Average Annual Valuation and 2015 salaries to see the differences.

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A little over a month ago, I wandered into the depths of the Baseball Prospectus PITCHf/x leaderboards, looking to see who had the most increased movement on their breaking pitches through the first month of the season compared to last year. As you might imagine, increased movement doesn’t always mean increased success, and so many of the names that turned up were interesting but inconclusive: seeing names like Rick Porcello and Ross Detwiler leading best-of lists tells us that the article was a fun exercise, if not a totally meaningful one.

However, there were a couple of interesting names when it came to right-handed pitchers with increased horizontal movement on their sliders. First, there was Sonny Gray, who is now the proud owner of a top-three slider by run value this year. Then, coming in a close third after Seth Maness, was Drew Storen. Unlike Gray and Maness, Storen has been around for a while, so the prospect of him tinkering with pitches (especially after four mostly successful years), drew some attention.

That attention was, and is, warranted: Storen’s slider (PITCHf/x calls it a slider; some say it’s a cutter. For ease, we’ll go with slider) now has over two inches of greater horizontal movement than last season, and at least one inch more than his previous career-high. Take a look at the horizontal movement change of his slider over his career, courtesy of Brooks Baseball:

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Whether or not you think Jose Tabata intentionally moved his elbow into the path of Max Scherzer’s two-out, ninth-inning curveball this past Saturday, the final result stood as an example of a very rare phenomenon: a perfect game broken up on the would-be final out of the game. While still securing the no-hitter put Scherzer firmly into the record books, the history of the almost-perfecto is incredibly interesting in its own right, as is the unparalleled dominance the Nationals right-hander has shown in his past two starts.

Scherzer now has a distinct place in the discussion of historic pitching performances. We should make sure to put the emphasis on the plural of the word performance, because Scherzer just put together arguably the best back-to-back outings by a starting pitcher since at least 1914. His final combined line for his starts on June 14th and 20th:

18.0 IP, 1 H, 0 R, 0 ER, 1 BB, 1 HBP, 26 K

Scherzer faced 57 batters over his two starts: he struck out just under 46% of them. To put that in context, he had a better strikeout rate over the entirety of two consecutive complete games than Aroldis Chapman, Craig Kimbrel, or Dellin Betances have in their relief appearances this season. By the numbers, he was more or less the equivalent of facing the best closer in baseball on a particularly dominant day for two entire games.

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Blind comparisons are always fun. They’re fun because we have set notions about who players are, and when we strip away names, similarities that we didn’t think possible come to the surface. With that said, here are two players:

Player A, as you might have guessed by the title of the article, is Todd Frazier. Player B — he of the lower ISO and almost exact same strikeout and walk rates — is Josh Donaldson. An oft-used term is “the poor man’s version of so and so,” but currently, Frazier isn’t the poor man’s version of anyone — in fact, he’s been one of the best players in baseball through the first two months of the season. Donaldson is too, and he probably plays a little better defense than Frazier does.

However, the Reds third baseman is up there: he has almost the same WAR (3.8) as Mike Trout (3.9), and his current ISO is third only to Bryce Harper and Giancarlo Stanton’s. That doesn’t mean Frazier will finish this season with the same WAR as Trout, or the same ISO as Harper or Stanton, but it’s interesting and requires our attention.

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