Although St. Louis’s 67-66 record puts them 5.0 games out of a Wild Card berth, our projections continue to give them a still-realistic 13.0% chance at cracking the playoffs due to the talent on their roster. Mike Leake wasn’t helping much, as the veteran righty had allowed at least four runs in each of his last four starts, yielding a protuberant 10.24 ERA. St. Louis had apparently seen enough, trading Leake to Seattle. In his place, they’ve called up top prospect Jack Flaherty to make his major-league debut tonight at San Francisco. Flaherty ranked No. 57 on Eric Longenhagen’s updated top-100 list.

Flaherty was nothing short of excellent in the minors this year, pitching to a stellar 2.18 ERA in 25 starts between Double-A and Triple-A. Most impressively, he struck out 25% of opposing batters while walking just 6%. If you’re looking for a nit to pick, it’s that Flaherty isn’t much of a ground-ball pitcher and, largely as a result, was a little homer-prone in his 15 Triple-A starts. But otherwise, his recent minor-league track record is impeccable.

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Detroit acquired a trio of prospects from Houston last night in exchange for Justin Verlander. Two of those prospects appeared on our updated Astros top-10 list and will likely occupy a similar place in Detroit’s improving system. Before we examine the state of the Tigers’ minor-league talent, however, let’s talk about the three young men who were just traded for one of this century’s best right-handed pitchers.

The centerpiece of this package is 19-year-old Venezuelan righty Franklin Perez. Perez began the year with three dominant starts in High-A before he was shelved for a month with knee soreness. His results have been mixed but generally positive since his late-May return. Despite a few hiccups, Perez was promoted to Double-A in July and has struggled with strike-throwing at times while missing fewer bats than he did in A-ball. But ultimately, we’re talking about a 19-year-old who, despite initially training in Venezuela as a third baseman, has already pitched his way to Double-A and who, when healthy and rested, shows an ability to locate and sequence four quality big-league offerings.

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The Arizona Fall League just announced its rosters for the 2017 season. These are subject to change for any number of reasons, and a combination of promotions, injuries, and trades will likely impact who arrives and who doesn’t between now and October 10th, when the Fall League’s seven-week season gets underway.

For the uninitiated, the Arizona Fall League is a developmental league featuring six teams, each of which are assigned players from five parent MLB clubs. This league has been a fleeting but well-lit stage for many of MLB’s top talents, including Mike Trout, Bryce Harper, Gerrit Cole and dozens others. The league is heavily scouted and players sent here often debut in the majors the following season. With that as introduction, below are my thoughts on the prominent/interesting prospects headed to the desert in October.

Glendale Desert Dogs
(CLE, CHW, LAD, PHI, PIT)

Glendale’s pitching staff has a few notable names, led by Pirates RHP Mitch Keller, who’ll pick up the summer innings he dropped in June due to a back strain. Keller has one of the best fastball/curveball combinations in the minors, but the changeup might be his developmental focus here in Arizona. Also on Glendale’s staff is hard-throwing Pirates LHP Taylor Hearn who came to Pittsburgh from Washington as part of last year’s package for Mark Melancon. He hasn’t thrown since July 13th, when he struck out a career-high 10 hitters in 4.2 innings for High-A Bradenton. He was put on the disabled list with an oblique strain two days later. Hearn has had several injuries throughout his career. He suffered from a strained UCL in high school and had a screw put in his elbow as a college freshman after suffering two humeral fractures. When healthy, Hearn sits 94-97 and throws a hard slider. Phillies lefty Elniery Garcia, whose velocity spiked into the mid-90s late last year and who was (coincidentally!?!) busted for Boldenone in April, missed 80 games this year. His fastball has been in the 89-93 range lately.

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Yesterday at the site, managing editor Dave Cameron examined the early major-league success of Philadelphia corner-type Rhys Hoskins. Cameron noted that, while Hoskins’ 50 or so plate appearances were hardly sufficient to proclaim Hoskins a great success, that the process by which Hoskins had produced his strong early returns not only resembled the process with which he’s succeeded in the minors but also the sort utilized by other similarly overlooked players who’d parlayed less-than-scintillating tools into legitimate major-league careers.

Broadly speaking, Hoskins possesses what might be called the Matt Carpenter profile, but it’s also the Ian Kinsler profile and Daniel Murphy profile and Justin Turner profile. In addition to relatively modest pedigrees, this class of player exhibits two other commons traits: both (a) very high contact rates and (b) very low ground-ball rates.

Cameron notes the significance of this combination:

In general, these two metrics move in opposite directions. Guys with flat, level swings usually put the bat on the ball more often, while guys whose swings are designed for loft tend to have to accept some swing-and-miss as part of the deal. The qualified hitter with the lowest ground-ball rate this year? Joey Gallo, whom you might have heard strikes out sometimes. Such is the cost of swinging for elevation.

Players who are able both to elevate frequently and make contact at an elite rate have essentially hacked the system. They’re able to reap the benefits of getting the ball in the air without having to contend with the major cost — i.e. a decline in contact. Carpenter, Kinsler, Murphy? They all do it. Hoskins? He does it, too. Or he did it in the minors, at least. And if he continues to do it in the majors, he should exceed the expectations established by his prospect pedigree.

Hoskins likely isn’t the only prospect who possesses this combination of skills, however. And, if there are others, it might worthwhile to identify them. Which, that’s what I’ve endeavored to do here. The method I’ve utilized is a bit crude, but it nevertheless captures the basic skills for which we’re searching.

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Below is an updated summer top-100 prospect list. Above are links to the top-10 lists for teams in each of the six divisions. Those include notes on why some of these prospects have moved up or down on their respective org list. For detailed scouting information on individual players, check out the player’s profile page, which may include tool grades and/or links to Daily Prospect Notes posts in which they’ve appeared this season. For detailed info on players drafted or signed this year, check out our sortable boards. The preseason top-100 list is available here.

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Below are the updated summer top-10 prospect lists for the orgs in the American League West. I have notes beneath the top 10s explaining why some of these prospects have moved up or down. For detailed scouting information on individual players, check out the player’s profile page which may include tool grades and/or links to Daily Prospect Notes posts in which they’ve appeared this season. For detailed info on players drafted or signed this year, check out our sortable boards.

Houston Astros (Preseason List)

1. Kyle Tucker, OF
2. Forrest Whitley, RHP
3. Franklin Perez, RHP
4. Yordan Alvarez, 1B
5. Derek Fisher, OF
6. J.B. Bukauskas, RHP
7. Gilberto Celestino
8. Daz Cameron
9. Cionel Perez, LHP
10. Colin Moran, 3B

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Below are the updated summer top-10 prospect lists for the orgs in the American League East. I have notes beneath the top 10s explaining why some of these prospects have moved up or down. For detailed scouting information on individual players, check out the player’s profile page which may include tool grades and/or links to Daily Prospect Notes posts in which they’ve appeared this season. For detailed info on players drafted or signed this year, check out our sortable boards.

Baltimore Orioles (Preseason List)

1. Chance Sisco, C
2. D.L. Hall, LHP
3. Ryan Mountcastle, OF
4. Austin Hays
5. Cedric Mullins, OF
6. Cody Sedlock, RHP
7. Keegan Akin, LHP
8. Hunter Harvey, RHP
9. Jomar Reyes, 3B
10. Anthony Santander, OF/1B

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It’s been a rough season for the Phillies, whose record is the worst in baseball and sits comfortably below .400. They’ve trotted out quite a few bad players on a regular basis, including Tommy Joseph, who’s given them four months of disappointment at first base. While Joseph was turning in a 90 wRC+ with poor defense, Rhys Hoskins was annihilating Triple-A. Finally, the Phillies are giving him a whirl at the highest level.

Prior to his call-up, Hoskins hit an insane .284/.385/.581 across 475 Triple-A plate appearances. He belted 29 homers and simultaneously struck out less than 16% of the time. This performance didn’t come out of nowhere, either, as Hoskins slashed .281/.377/.566 and blasted 38 homers last season at Double-A. Those numbers were undoubtedly helped by his home ballpark in Reading, which led many to doubt their validity. But KATOH still loved him because the power numbers were so exceptional and they came packaged with acceptable strikeout rates.

My KATOH system pegs Hoskins for 10.0 WAR over his first six seasons by the stats-only method and 9.4 WAR by KATOH+, which incorporates his No. 69 rank on Baseball America’s midseason list. Those marks place him 14th and 27th, respectively, among prospects. 

Those WAR estimates don’t tell the whole story, however, as KATOH sees some serious star potential in Hoskins, giving him a roughly 1-in-5 chance of racking up over 20 wins over the next six years. For reference, Joey Votto, Paul Goldschmidt, Adrian Gonzalez, Miguel Cabrera and Freddie Freeman were the only first baseman who crossed that threshold in the six-year span that ended in 2016.

To put some faces to Hoskins’ statistical profile, let’s generate some statistical comps. I calculated a Mahalanobis distance between Hoskins’ 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.

Hoskins is limited to first base, which obviously puts a lot of pressure on his hitting. Even if he’s an above-average defender there, as Clay Davenport’s numbers suggest he is, the offensive bar remains extremely high. This is why KATOH sees him as a No. 20-ish prospect, even though his offensive numbers are eons better than most of the hitters ranked ahead of him. Nonetheless, hitters who pair that type of power with good contact skills are quite rare. Throw in that he also draws walks, and Hoskins looks like he could be a pretty special hitter.