Less than a month ago, the Washington Nationals called up top prospect Lucas Giolito, with the hopes that he’d fill a hole in their rotation. However, as often happens with promising young pitchers, Giolito looked a bit overmatched in his first taste of the big leagues. He recorded more walks than strikeouts in his two starts with Washington, and was subsequently sent back to the minors to further refine his breaking stuff. Giolito will surely be back sooner rather than later, and still appears to have a bright future ahead of him. For now, though, the Nationals are turning to another electric young arm: hard-throwing 22-year-old Reynaldo Lopez debuts tonight against the Dodgers.

Lopez was signed out of the Dominican back in 2012, and his stuff has landed him on top-100 prospect lists for a couple of years now. But up until this season, he his minor-league performance hadn’t quite matched up with his stuff for any extended period. He spent the 2015 season in the High-A Carolina League, where he posted a mediocre 4.09 ERA. His peripherals suggest he pitched much better than that, but his 23% strikeout rate still underwhelmed.

He opened 2016 at the Double-A level, and soon began missing bats at a rate commensurate with his stuff. His 30% strikeout rate is tops among qualified Double-A pitchers this year. He also managed to keep his walk rate under 8%. Though he wasn’t super sharp in his two most recent starts at the Triple-A level, the body of Lopez’s 2016 campaign bodes well for his future in the bigs.

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Yesterday, I wrote about the worst called ball of the first half, and that post always makes this post a necessity. Within that post, I noticed something: The worst called ball of the first half was thrown by an Angels pitcher, to a White Sox hitter. Last year, the worst called ball of the season was thrown by a White Sox pitcher, to an Angels hitter. It all balanced out. Tremendous! The universe is good.

Well, the worst called strike of the first half was thrown by Max Scherzer, to an outfielder on a rebuilding team, with Wilson Ramos catching. The worst called strike of the previous first half was thrown by Max Scherzer, to an outfielder on a rebuilding team, with Wilson Ramos catching. It didn’t balance out. It’s not tremendous. The universe is bad.

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Most All-Stars weren’t born into baseball this way. Most of them had to alter their approach, or their mechanics, in order to find that a-ha moment. They threw a pitch differently, or decided to pull the ball more, or changed their swing, and then found a run of sustained success that put them in the All-Star game that’s being played tonight.

So, given fairly fettered access to the All-Stars from both leagues, that was the question I posed: what was the big adjustment, mechanical or approach-wise, that brought you to this podium today?

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Lucas Giolito was once the 2012 draft’s odds-on first-overall selection. As he began his senior season at Harvard-Westlake, Giolito was seen as the most talented player in a draft class that included Byron Buxton and Carlos Correa. It would have made him the first and only high-school righty to be selected at 1.1 in the draft’s history. But then Giolito felt discomfort in his elbow during the first inning of an early-March start (he was up to 100 mph and had thrown a one-hitter the start before) and removed himself from the game in the second.

An MRI revealed damage to Giolito’s UCL but not so much that he would require immediate ligament reconstruction. Despite that, Giolito’s season was over and so, too, were his chances of going first overall. As the draft approached and the Astros, who possessed the first pick, shifted their focus toward Correa and other prospects (including Giolito’s teammate Max Fried), the industry wondered when and where Giolito would be selected. There wasn’t much precedent at the time for pre-draft UCL injuries and Giolito’s stock remained volatile until very late in the process. He was still being mocked within the top-five picks into late May.

The Nationals drafted Giolito 16th overall and signed him, at the deadline, for $2.925 million, exactly $800,000 over the pick’s slot value at that time and about $300,000 more than the slot’s value in 2016. Giolito threw two innings for the Nationals’ GCL team on August 14th of that year. On August 31st, Dr. Lewis Yocum fixed his elbow.

Giolito returned 10 months later, especially notable considering that effective Tommy John rehabilitations generally require 12-18 months. It has been almost exactly three years since Giolito made his first post-TJ start and his stuff has returned to pre-surgery levels.

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It’s raining prospects. The prospect gods gave us Brandon Nimmo and A.J. Reed over the weekend, and today we’re treated with another prospect debut: hard-throwing righty Lucas Giolito. The former first-rounder will take the hill for the Nationals in tonight’s game against the New York Mets.

Giolito pitched exclusively at the Double-A level this year, where he posted a 3.22 FIP and a 23% strikeout rate. That performance is nothing to sneeze at, especially coming from a 21-year-old, but it’s a tad underwhelming when held against his numbers from prior seasons. Giolito showed an exceptional penchant for missing bats at the low minors, but he hasn’t been quite as prolific since he was promoted to Double-A last July. He posted a 29% strikeout rate in 168 innings in A-Ball between 2014 and 2015, but saw that figure dip below 23% in his 118 Double-A innings. His walk rate also ticked up upon reaching the Double-A level.

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When the Nationals decided to begin the year with Danny Espinosa as their starting shortstop, with top prospect Trea Turner beginning the year back in Triple-A, it was widely seen as another example of a team manipulating the service time rules in order to extend their controllable years over a valuable player. That narrative was seemingly reinforced when the Nationals stuck with Espinosa even after he hit .185/.316/.246 in April, especially given that Turner was hitting .317/.387/.463 in Triple-A at the end of the first month of the season. And as the two disparate batting lines were compared and contrasted, calls for Turner to replace Espinosa got louder and louder.

Trea Turner's at .357/.430/.529 in AAA. Danny Espinosa is hitting .182/.324/.200 and his OBP is inflated by batting in front of the pitcher.

— keithlaw (@keithlaw) April 28, 2016

Yet the Nationals stuck with Espinosa. They pointed to his superior defense as a primary reason, also noting that Turner has some work to do with the glove, and stuck with that plan even after Turner came up and went 3 for 3 with a double and a walk after he got summoned to the big leagues while Ryan Zimmerman went on paternity leave. And now, as we reach the end of June, it’s probably time to admit the Nationals made the right call.

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Before homering last night in the first inning of a 3-2 loss to the Dodgers, Bryce Harper’s OPS had briefly fallen all the way below .900. And while that might seem like occasion to sound the alarms, let’s get one thing straight: Bryce Harper’s season numbers are still great. His OBP is still above .400, his power’s still been immense, and by wRC+, he’s still had as good a year as Nolan Arenado and the Seager boys.

But lately, things haven’t been right for the reigning MVP. A couple months ago, we had a post here on the site about how Harper was catching up to Mike Trout, and it was totally reasonable. And it still probably is, but over the last 30 days, Harper’s wRC+ is 80, his OBP the same as what Andrelton Simmons did last year, and he’s hit for as much power during that stretch as 2015 Kevin Pillar. It’s the most underwhelming Harper’s looked since the middle of 2014:

Y’know what’s not an ideal way to break out of a slump? Face Clayton Kershaw. Harper did that on Monday night, and he did not break out of the slump. No, he faced Kershaw three times, and he fanned three times.

Even with the recent slide, Harper’s still viewed as the best hitter in world, and the best hitter in the world facing the best pitcher in the world is always worth an examination. But there’s something about this particular matchup at this particular time that makes it all the more fascinating. See, something’s been happening to Harper lately. Rather, something’s been happening to the way Harper’s being pitched lately.

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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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A few weeks back, we matched up three of the most dominant pitching performances from April, utilizing granular ball-in-play data, to determine which of Vince Velasquez, Jaime Garcia or Jake Arrieta had the best day. Velasquez won that time around, and with Max Scherzer recently authoring a 20-strikeout, no-walk complete game shutout over the Tigers, we have a worthy contender for the single-game pitching championship belt.

There’s one rule for entry into this competition: you had to finish what you started. Only complete games apply. Then we simply look at every batted ball allowed, and first calculate each pitcher’s single-game Adjusted Contact Score based on exit speed and angle data. Then, we add back the Ks and BBs, and calculate each pitcher’s single-game “tru” ERA-. With these two performances, we don’t need to worry about adding back any BBs.

Velasquez vs. Scherzer – Exit Speed/Angle Data

			AVG ALL	AVG FLY	AVG LD	AVG GB	AVG VERT
Velasquez	vs. SD	14-Apr	88.1	89.1	87.2	87.4	20.8
Scherzer	vs. DET	11-May	86.6	93.1	93.5	56.8	19.1
MLB Avg.	Thru	18-May	89.4	90.0	93.5	87.4	11.0

Both of these pitchers followed similar paths in their dominant outings. Besides striking out 36 and walking none between them, both pitchers allowed very high average exit angles, and very few grounders. Only extreme fly-ball/pop-up pitchers sustain average exit angles near 20 over a full season, the Chris Youngs and Jered Weavers of this world.

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Recording 20 strikeouts is an amazing feat — and a rare one, too: this past Wednesday, Max Scherzer joined Roger Clemens, Kerry Wood, and Randy Johnson as the only players ever to accomplish it in nine innings. What they’ve done is exceptional and, naturally, separates them from other pitchers. And while similar, each performance occurred in the context of different variables which made it distinct: era, opponent, ballpark, etc. No one is required to decide which pitcher faced the most challenging set of circumstances among those five games (Clemens did it twice). Yet, I’ve elected to make an attempt, anyway.

When first trying to understand which game posed the most difficultly, we immediately turn to the opponent. Roger Clemens, for example, achieved both of his 20-strikeout games with the designated hitter in play. Striking out 20 players of major-league caliber — regardless of how low they are on that particular scale — is still incredibly difficult. It’s more difficult to record 20 strikeouts against good hitters. The Detroit Tigers lineup Scherzer faced, meanwhile, is a top-heavy one. But solid overall, even if it didn’t feature a DH.

The table below depicts the lineup the Tigers deployed against Scherzer as well as each respective hitter’s rest-of-season projected numbers for wRC+ and strikeout percentage. (Jordan Zimmermann‘s career numbers were used, and his strikeout percentage and wRC+ were combined proportionally with pinch-hitter Jarrod Saltalamacchia’s. Weighted average accounts for the top of the order getting more plate appearances than the bottom)

Tigers Lineup Against Max Scherzer

Player	wRC+
Ian Kinsler	101
J.D. Martinez	124
Miguel Cabrera	145
Victor Martinez	119
Justin Upton	118
James McCann	71
Anthony Gose	80
Jose Iglesias	84
Jordan Zimmermann	33
AVERAGE	97
Weighted AVG	100

*Zimmerman’s wRC+ averaged proportionally with pinch-hitter Jarrod Saltalamacchia.

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