Ariel Miranda sounds like one of those weird Disney Princess mashups that were fashionable clickbait last year — Click to see the Disney Princesses re-imagined as Sex and the City characters! Click to see the Disney Princesses re-imagined as members of the 2003 Philadelphia Eagles Secondary! Click to see the Disney Princesses re-imagined as America’s most infamous serial killers! — but he is an actual baseball pitcher who has come on of late and become a fairly interesting prospect of advanced age.

Miranda, a 6-foot-2 Cuban lefty, signed in May of 2015 after he defected and established residency in Haiti. He pitched across three levels during his first full season, finishing his initial domestic campaign with a solid eight-start run with Double-A Bowie. Miranda has passed 2016 in Triple-A (except for a two-inning shot of espresso with the Orioles early in July) and, while a 3.93 ERA from a 27-year-old isn’t exactly sexy, he’s flashed viable big-league stuff. His fastball will touch 95 mph on occasion and sits 90-93. Miranda has a quick, athletic arm and incorporates his lower half into a picturesque delivery that he doesn’t always finish. When he’s not driving the ball down, he lives either up in the zone or out of it altogether, something of which major-league hitters will take full advantage, but he’s capable of missing bats in the zone with his fastball. Miranda has been able to throw plenty of strikes this season, just not always where he wants to, and his control is ahead of his command.

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The Athletics are moving two rentals in exchange for three very interesting pitching prospects, all of whom have bullpen-worthy stuff at worst — and mid-rotation upside at best.

The headliner of the deal, at least as far as upside is concerned, is RHP Grant Holmes. Holmes, who was committed to Florida, was the 22nd-overall pick in 2014 and signed for $2.5 million out of Conway High School in South Carolina. He touched 100 in high school and was one of the draft’s more advanced prep arms with a more mature body and better strike-throwing ability than many of his hard-throwing peers. After signing, he descended upon the AZL, which was clearly already beneath him at the time, and dominated before moving to the Pioneer League for his last few starts of the season.

In 2015, Holmes’ control went backwards and he walked 54 hitters in 103.1 innings for Low-A Great Lakes. Walks have remained an issue this season (43 free passes in 105 innings). Holmes is an above-average athlete and his delivery isn’t overtly violent or difficult to repeat, but his arm action is long and his release point has been inconsistent. Eventually, I think Holmes will throw enough strikes to start though two straight years of serious control issues are officially concerning.

The stuff is great. Holmes was 92-94 mph and touching 95 for me in April and has generally been in that range all year. His fastball moves, a product of his arm slot, and can be unhittable when he locates it. Holmes’ primary offspeed weapon is his curveball which, when he breaks off a good one, looks like a slider’s caricature. It has two-plane, slider shape and slider velociy (about 79-82) but has the vertical depth of a curveball. It flashes plus but is also inconsistent and can tilt in without much bite.

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In exchange for LHP Zach Duke, the White Sox received fourth-outfield prospect Charlie Tilson from St. Louis. Tilson is a plus-plus runner with good bat-to-ball skills but doesn’t project as a regular because of his complete lack of power.

A Chicago-area high schooler, Tilson blew up a bit at the Area Code Games as a rising senior when he stole seven bases in three days of play. The Cardinals selected him in the second round of the 2011 draft and gave him $1.275 million to turn pro instead of heading to Illinois. He missed all of 2012 while recovering from surgery to repair a separated (non-throwing) shoulder, began 2013 in full-season ball and has made a ton of contact ever since. He was hitting .282/.345/.407 with Triple-A Memphis before the trade.

Tilson has just average bat speed, no leverage in his swing and very rarely extends enough to really punish the baseball, resulting in 30-grade game power. He can play all three outfield positions, though his arm is fringe average and fits best in center and left. His ability to play center field while making a lot of contact is probably enough to win him a major-league roster spot, but unless his defense in center greatly outpaces present projections, he only profiles as a bench outfielder or below-average regular.

Despite a relatively humble collection of tools, Tilson ranked 81st on Chris Mitchell’s updated KATOH rankings.

Taylor Hearn has been drafted four times, first selected by the Pirates in the 22nd round of the 2012 draft out of Royse City High School in Texas. After two years at JUCO powerhouse San Jacinto, Hearn transferred to Oklahoma Baptist for his junior season, struck out 71 hitters in 64.1 innings, and was selected in the fifth round of the 2015 draft by Washington.

Hearn was starting for the Nationals’ GCL affiliate before moving to the bullpen upon his promotion to Hagerstown. Despite pitching exclusively in relief for the past month, he has remained stretched out, throwing multiple innings in each appearance, and the Pirates have stated that they hope to develop him as a starter. He has the body and delivery for it.

A lithe and projectable 6-foot-5, Hearn has some issues repeating what is a loose and athletic delivery. The arm is quick and Hearn extends well, allowing his mid-to-upper 90s velocity to play up. Hearn sits 93-96 mph but has been up to 99 in short stints and his fastball features good downhill plane. His slider is average and Hearn has very little command of it, but it has a chance to tick up a half grade or so with reps. His changeup is also promising and projectable, mostly because of how quick and athletic the arm is, and I do think Pittsburgh is right to try to develop Hearn as a rotation arm. The body, delivery and repertoire to start are all either here already or reasonably foreseeable, though moving Hearn along as a starter will take longer than if Washington fast tracked him as a ‘pen arm.

Hearn has had some injury issues 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. There’s lots of risk involved here, because of Hearn’s injury history and because he throws a baseball very hard for a living, but it’s a intriguing flier for Pittsburgh.

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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The package netted by Brian Cashman and the Yankees in exchange for Andrew Miller is headlined by two big names in OF Clint Frazier and LHP Justus Sheffield (both of whom project as average-or-better regulars for me) and supplemented by two potential relievers in RHPs Ben Heller and J.P. Feyereisen.

Clint Frazier was the fifth-overall pick in the 2013 draft out of Loganville High School in Georgia. He was signed away from his commitment to Georgia with a $3.5 million bonus, the most lucrative bonus in Indians draft history. Frazier was a high-effort spark plug with elite bat speed, though he didn’t look like your typical high-upside prep draftee.

Before the draft, most organizations were correctly skeptical about Frazier’s long-term ability to play center field despite some of the run times he was posting (he ran a 6.6-second 60-yard dash at East Coast Pro) because of the way they anticipated his body to fill out. Frazier was listed at 5-foot-11, 185 pounds as an amateur but has grown into a listed 6-foot-1, 190, though he’s probably heavier than that. Despite his likely corner-only destiny, Frazier’s bat speed and advanced feel for hitting made him a worthy top-five selection, even if he had atypical physical projection.

Because of the superhuman circumference of his biceps and his generally muscular physique, Frazier is most often body-comped to Popeye the Sailor Man, a reference I hope doesn’t elude the youngest of our readers. Though he posts some plus run times to first base because of a natural jailbreak, he’s only about an average runner whose middling speed is masked by visible effort and good base-running instincts. Frazier’s speed and feel for center are enough that I think he’d be passable there in an emergency, but I wouldn’t advocate him playing there everyday. I think that, given his size and build just shy of age 22, Frazier is likely to slow down as he enters his prime. His arm strength should allow him to play in either outfield corner (though I think he fits best in left), where I believe he’ll be an average defender at maturity.

Frazier’s 80-grade bat speed has helped him generate a .278/.360/.452 career batting line. He’s hit despite the excessive loop his hands take back to the ball, a mechanical hiccup that I think causes his barrel to arrive late and robs him of the ability to pull the ball consistently. This could dilute his game power a bit, but Frazier is strong enough to muscle some of those balls out to right field anyway, and the new Yankee Stadium will be particularly kind to this flaw. Though his swing features a good bit of effort and Frazier has struggled some with strikeouts throughout his minor-league career, he still projects as an average Major League hitter. Again, the bat speed is the primary reason for this, but Frazier has shown that he has some barrel control and the ability to make adjustments in the middle of at-bats, as well. Reports on his makeup are glowing.

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Here are the prospects changing hands in today’s deal between Miami and San Diego 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.

Josh Naylor, 1B, San Diego (Profile)

KATOH: 4.4 WAR (80th overall)
KATOH+: 4.6 WAR (77th overall)

Though he turned 19 just last month, Naylor’s held his own in Low-A this year. Nothing in Naylor’s batting line is particularly great, but he also lacks a major weakness. He makes a decent amount of contact and draws an acceptable number of walks. His home-run total is a bit underwhelming for a first baseman, but’s made up for it by hitting a bunch of doubles this year. He’s also swiped 10 bases and played good defense, so KATOH gives him something of a pass for his underwhelming offensive numbers.

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University of Nevada CF and member of the USA Collegiate National Team T.J. Friedl is expected to sign a lucrative NDFA (non-drafted free agent) deal with the Cincinnati Reds. Friedl, a redshirt sophomore in 2016, was eligible to be drafted in June but, due to confusion with how he was listed on Nevada’s roster, the industry — and, rumor has it, Friedl himself — was unaware that he was draft-eligible. Only once Friedl began to make waves this summer with Team USA did scouts begin to look into his background and realize that he had slipped through the cracks and was eligible to sign.

Of course, NDFA’s that sign for over $100,000 count against the signing club’s draft bonus pool and as bidding for Friedl began to heat up, many teams had no room to make a run at him. The Reds had around $700K worth of money to spend without incurring heavy penalties for exceeding their pool limit, and indeed I’ve heard anything from $500-$750K as the likely amount here, with more sources indicating the number is toward the low end of that range. Tampa Bay was also heavily involved in negotiations with Friedl.

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Adalberto Mejia’s turned in a 2.81 ERA in 18 starts between Double-A and Triple-A this year. His ERA was helped by a low BABIP, especially at the Double-A level. But even so, his 24% strikeout and 6% walk rates signify a solid pitcher. Although he’s pitched professionally since 2011, Mejia didn’t turn 23 until last month, which makes his high-minors dominance all the more impressive. Mejia’s numbers where significantly less impressive in a limited sample last season, but were still encouraging from a 22-year-old at Double-A.

My newly revamped KATOH projection system rates Mejia as a good, but not elite, pitching prospect. It projects him for 3.4 WAR over his first six seasons by the traditional method. Incorporating Baseball America rankings bumps Mejia’s forecast up to 3.9 WAR, which places him 94th overall among all prospects. To help you visualize what KATOH’s projection entails, here is a probability density function showing KATOH+’s projected distribution of outcomes for Mejia’s first six seasons in the major leagues.

To put some faces to Mejia’s statistical profile, let’s go ahead and generate some statistical comps for the southpaw. I calculated a Mahalanobis distance between Mejia’s Double-A and Triple-A performance this year and every season at those levels since 1991 in which a pitcher recorded at least 350 batters faced. 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. A lower “Mah Dist” reading indicates a closer comp.

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.

Newly acquired Minnesota Twins LHP Adalberto Mejia doesn’t have the fire-breathing stuff that many of his fellow 2016 Futures Game participants do, but he combines a deep, usable repertoire with advanced sequencing to accrue outs — and was arguably the most advanced arm in the 2015 Arizona Fall League.

Mejia signed with San Francisco early in 2011 for $350,000 and dominated the Dominican Summer League later that year. He was sent directly to a full-season affiliate for his stateside debut the next year as a 19-year-old. In July of 2013, when the Giants needed an arm for a spot start at Triple-A, they were comfortable enough to let Mejia, then 20 years of age, make that start. Over 18 starts between Double and Triple-A this season, Mejia has a 2.81 ERA.

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