Projecting Yankees’ Speedy A-Baller, Jorge Mateo

Yankees prospect Jorge Mateo has some serious wheels. In 96 games with Low-A Charleston, the Dominican-born shortstop stole an eye-popping 71 bases. He leads the South Atlantic League by more than 14 steals, despite the fact he was promoted to High-A a little over a week ago. Mateo’s posted gaudy stolen-base numbers in past years too. He swiped 11 bags in just 15 games in the Rookie-level Gulf Coast League last year. The year before that, he lead the Dominican Summer League with 49. If you hadn’t guessed it by his stolen-base totals, his speed grades out as an 80 on the 20-80 scale.

Speed is clearly Mateo’s calling card, but he’s no slouch with the bat, either. The shortstop hit a respectable .268/.338/.378 in 96 games in the South Atlantic League, and has hit .464/.500/.714 in 30 plate appearances since his promotion to High-A, giving him a wRC+ of 116 on the year.

Aside from his speed, though, he doesn’t really stand out from the crowd in any one area offensively. Over his stint in A-Ball, his walk and strikeout rates were both a stone’s throw from the Sally League average, while his isolated power was maybe a notch below. A good chunk of his production has came from his .338 BABIP, which certainly had something to do with his top-notch speed. Here’s a look at how Mateo graded out by each of these metrics in Low-A after regressing for sample size and centering to league average. In case you were wondering, his stolen-base numbers put him close to five standard deviations above the mean.

Of course, these numbers are based solely on the 2015 season, which has been just over 400 plate appearances for Mateo. But prior to this year, there’s very little data on the 20-year-old. Due to a wrist injury, he made it into just 11 games in the Gulf Coast League last year. And prior to 2014, he played exclusively in the Dominican Summer League, where the level of competition is laughably low.

Mateo has little meaningful statistical data to his name. But there’s enough there to speculate on some possible futures for the 20-year-old. Running his 2015 numbers through the KATOH machine yields a forecast of 3.8 WAR through age 28 with a 74% chance of cracking the big leagues over that same period. This would have made him the 115th-highest-ranked prospect on KATOH’s preseason list. Not too shabby for a guy who’s still in A-Ball.

How about some comps? What’s become of past players who posted outrageous stolen-base numbers and similar batting lines in Low-A? Using league-adjusted, regressed stats, along with age, I calculated the Mahalanobis Distance between Mateo’s performance and every Low-A season since 1990 in which a batter recorded at least 400 plate appearances. Below, you’ll find a list of historical players whose performances were nearest and dearest to Mateo’s, ranked from most to least similar.

Rank	Name	Mah	PA thru 28	WAR thru 28
1	Everth Cabrera*	2.51	2,068	4.2
2	Billy Hamilton*	2.57	1,035	5.8
3	Pedro Santana	2.69	0	0.0
4	Anthony Gose*	2.95	961	1.7
5	Jason McFarlin	3.21	0	0.0
6	Ty Morrison*	3.62	0	0.0
7	Mallex Smith*	3.81	0	0.0
8	Eric Young	3.82	1,273	2.0
9	Chris Morris	4.54	0	0.0
10	Tyrone Pendergrass	4.55	0	0.0
11	Delvi Cid*	4.76	0	0.0
12	Carlos Gomez	5.02	3,364	22.5
13	Anton French	5.02	0	0.0
14	Rafael Bautista*	5.04	0	0.0
15	Mateo Ozuna	5.13	0	0.0
16	Bernie Castro	5.15	209	0.0
17	Victor Hall	5.23	0	0.0
18	Delino DeShields*	5.31	286	0.9
19	Rod Lindsey	5.39	5	0.0
20	Lee Heath	5.89	0	0.0

*Hitters who have yet to play their age-28 seasons.

And here are a few who played primarily shortstop, as Mateo did.

Rank	Name	Mah	PA thru 28	WAR thru 28
2	Billy Hamilton*	2.57	1,035	5.8
22	Andrew Romine	6.12	447	0.2
26	Dee Gordon*	6.48	1,750	4.9
35	Aaron Holbert	7.37	3	0.0
38	Jose Peraza*	7.69	5	0.1
41	Tyler Pastornicky*	7.81	268	0.0
42	Jose Morban	7.88	77	0.0

*Hitters who have yet to play their age-28 seasons.

It’s not at all surprising to see Billy Hamilton’s name near the top. Hamilton grabbed all of our attentions in 2011, when he cleared the 100-steal mark in Low-A. Everth Cabrera, Mateo’s top comp, also performed similarly back in 2008, the season before the Padres snagged him in the Rule 5 draft.

Cabrera’s and Hamilton’s seasons were the most similar to Mateo’s, but that’s not to say they’re all cut from the same cloth. In fact, there’s reason to think Mateo will hit for significantly more power than either Cabrera or Hamilton — and possibly anyone else listed above outside of Carlos Gomez. For one, Mateo hit for a tad more power in Low-A than the majority of his Mahalanobis comps, including nine of the top 12.

But perhaps more importantly, Mateo has a decent amount of power that hasn’t yet shown up in games. Although his numbers may suggest it, Mateo isn’t nearly the punchless hitter that Hamilton is. Kiley McDaniel gave Mateo’s game power a future grade of 45+ in his preseason write-up, which blows away Hamilton’s 30 pop. Mateo’s not a power hitter by any means, but unlike many of his statistical comps, he should have no trouble clearing the Rexrode Threshold.

On the defensive side of things, many think he’ll be able to stick at shortstop, which would obviously help his value. Kiley thinks he has the arm, range and hands to stick at the position, and just needs to refine his footwork and instincts. For what it’s worth, Baseball Prospectus’ minor league FRAA has him as roughly a scratch defender at shortstop this year.

Mateo can do some pretty impressive things on a baseball diamond. But as with most speed-first hitters in the low minors, it’s a matter of whether he’ll hit enough to be worthy of a lineup spot. To Mateo’s credit, he’s more than held his own so far, but one could have said the same about the dozens of flops listed in the table above. Merely good hitters in the low minors don’t always make for productive big leaguers, even when their foot speed is off the charts.

Still, while he’s a few years away from the show, Mateo’s upside is clear, which is why the Yankees were so hesitant to move him at the trade deadline. It’s still too soon to say with any certainty whether Mateo’s bat — particularly his power — will develop the way scouts expect it will. But if it does, and if he also manages to stick in the middle of the diamond on defense, he should make for a very valuable player.