With Miguel Cabrera heading back across the diamond to first base, Nick Castellanos is returning from the outfield to his natural position at the hot corner. When the Tigers brought in Prince Fielder, it appeared that Castellanos was completely blocked at the major-league level, so the Tigers tried to transition the 21-year-old to the outfield. With Fielder gone, that problem is a thing of the past.

There’s plenty to like about Castellanos, the top prospect in Detroit’s organization. His bat is very quick through the zone, and there’s never been much of a question among scouts about the quality of his hit tool. His power stroke is showing signs of life, as he has increased his home run total in each of his three full minor-league seasons; he hit seven homers in A-ball in 2011, 11 across three levels in 2012 and 18 in Triple-A last year. Another big positive for Castellanos is the improvement in his contact rate. He struck out in 23.1% of his plate appearances in 2011, followed by 20.2% in 2012 and 16.8% last year.

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I’ve seen Andrew Heaney pitch several times, but the most memorable occasion was at the 2012 Big XII Baseball Tournament. Oklahoma State and Oklahoma were facing off at 9:00 am on a Wednesday. Bleary-eyed and still trying to wake up, I snagged a coffee and a breakfast burrito (not my usual ballpark fare) from the concession stands and headed down to take my seat behind home plate. Clearly, my expectations for this game were pretty low; after all, this was possibly the earliest start time many of the players had ever experienced.

I may have been a bit low on energy, but Heaney was ready to roll. The lanky lefty took the hill like it was 7:00 pm on a Friday and proceeded to systematically dismantle a very good Oklahoma team that would go on to the super-regionals. Through the first eight innings, Heaney allowed only two soft singles, with one walk and eight strikeouts, on just 86 pitches. His fastball was a tick below his usual velocity, as he was maxing out at 92 mph instead of 94, but his three-pitch mix still had opponents flailing wildly. His mid-80s slider was maybe even better that morning than I’d previously seen, and he was consistently hitting the strike zone with his low-80s change-up as well.

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It seems like every time I bring up how excited I am about Jonathan Gray as a fantasy prospect, the first thing I hear in response is some variation of, “Yeah, but what about Coors Field?” It’s a fair question, to be certain. While the Coors Field effect has been lessened since the installation of the humidor, it is still a very hitter-friendly park. Part of the explanation for this is that the thin air in Denver decreases the spin on breaking balls, thus making them easier to square up as a hitter.

But let’s back up a bit and talk about Jonathan Gray first, shall we? I live in Oklahoma, and was lucky enough to see the No. 3-overall pick pitch more times than I could count when he was in college at the University of Oklahoma. First and foremost, Gray has one of the absolute best fastballs in the minors right now. He has huge velocity, sitting comfortably in the 95-97 mph range and dialing up triple-digits when he reaches back for a little more. The pitch has explosive late arm-side movement as well, making it incredibly difficult to barrel up for right-handed hitters. I have seen him crank it up all the way to 101 mph, and it isn’t unusual at all to see him unleash one in the upper-90s in the 9th inning. When scouts talk about an 80-grade pitch, this is what they’re talking about.

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Coming into the 2013 season, Aaron Hicks looked like he might have finally put it all together. The former first-round draft pick was coming off a highly productive season in Double-A, where he hit .285/.382/.459 with 13 homers and 32 stolen bases. Then came Spring Training, where Hicks looked like a man amongst boys, hitting an absurd .370/.407/.644 with four dingers and three steals while playing excellent defense in center field. The five-tool player that the Twins had spent so long cultivating was finally bearing fruit. Minnesota handed Hicks the starting job in center field over Darin Mastroianni and set him free to light the world on fire.

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The last two weeks, I have discussed two precocious prospects–Mets shortstop Amed Rosario and Rays righthander German Marquez–who were born in 1995. The idea of professional baseball players born in the middle of the 1990s probably still takes some getting used to for many casual observers, but indeed, we may be less than three years from seeing the first pro baseball player born in the 2000s.

Players like Rosario and Marquez hold a lot of intrigue, but they also are buried in short-season leagues, far from the majors, and thus also below the general prospect mainstream. This week, however, I’m going to examine a player born in 1995 who already has broken through into the mainstream consciousness: Royals shortstop prospect Raul Mondesi.

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Last week, I talked about the youngest regular position player in the Appalachian League: Mets shortstop Amed Rosario, who was named the circuit’s top prospect by Baseball America after the season. Sticking with the youth theme in the Appy, this week I’m going to focus on the league’s youngest regular starting pitcher, 18-year-old Rays righthander German Marquez. Marquez did not appear on BA’s top 20 postseason Appy prospects, but with solid performance (3.50 FIP), a nice arsenal, and plenty of time and room to develop further, I’d argue he deserves to be placed squarely among the circuit’s most intriguing players, and is definitely a player to watch.

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Down in Arizona to get one last fix of baseball before the lean winter months, I had the distinct pleasure of getting to watch Alex Meyer pitch three innings of shutout ball against the AFL East All-Star lineup — while sitting behind two excellent young fellows from Trackman baseball. There’s very little PITCHf/x in the minor leagues, and usually competitor Trackman’s data is proprietary and under lock and key. But in Arizona, the company enjoys its best chance to openly market their radar-based approach to pitch tracking, and the numbers their system provided were an interesting guide to a dominant outing by the Twins’ best pitching prospect.

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Analyzing prospects in short-season leagues can often be a confusing and fruitless endeavor. All three of pro baseball’s three large development hurdles–the jump to full-season ball, the jump to the upper minors, and the jump to the majors–remain in front of such players, and projecting how raw 17-21-year-olds are going to handle those difficult transitions years down the line cannot be done with much certainty. Still, there are plenty of relevant prospects in the short-season circuits, and today I’m going to discuss the first of a few that I personally viewed in the Rookie-Advanced Appalachian League in 2013: Mets shortstop prospect Amed Rosario.

Rosario had the distinction of being named the top prospect in the Appy by Baseball America, which immediately pegs him as someone to watch. So does his birth date: November 20, 1995. He was the youngest position player to open the year at the Rookie-Advanced level, which says a lot about how advanced he is for his age, even if the numbers he posted (.241/.279/.358 with a 43/11 K/BB, 3 HR, 2 SB, and a .941 fielding percentage in 58 games) veer closer to “problematic” than “exciting.”

But a player’s ranking on prospect lists and his raw numbers (particularly at such a low level at such a young age) do little to shed light on what sort of player he may become. For that, we have to turn to visual evidence.

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James Paxton, Enny Romero, Danny Duffy, Derek Holland, David Price, Chris Sale, Brad Hand, Martin Perez, Francisco Liriano, Jon Lester, Clayton Kershaw, Gio Gonzalez, Scott Kazmir, Matt Moore, Ross Detwiler, Patrick Corbin, Kris Johnson, Hector Santiago, Tony Cingrani, and Cole Hamels. A distinguished group of twenty, is it not?

The above list constitutes all lefthanded MLB starting pitchers who averaged 91.5 mph or more on their fastballs in 2013. As you can see, it consists largely of two groups: good, established MLB starters and unproven but exciting young guys who only got a few starts in the majors during the past season. Almost none of these guys have neither exciting presents nor exciting futures, and thus, anyone who projects to join this relatively selective club merits a closer look. One such pitcher is Pirates southpaw prospect Joely Rodriguez.

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The 2013 Hickory Crawdads were undoubtedly one of the most star-studded low-minors teams of the past decade. The Rangers’ Low-A affiliate, they had Joey Gallo, who became the first teenager in half a century to hit 40 homers in a season…and did it in just 113 games. For much of the season, though, Gallo trailed teammate Ryan Rua in the minor league home run chase (Rua finished with 32, 29 of them coming in 104 games with Hickory). They had Jorge Alfaro, who many consider one of baseball’s top catching prospects. They had Nomar Mazara, who holds the record for the highest signing bonus by a Latin American amateur, at $4.95 million. They had 2012 first-rounder Lewis Brinson, second Dominican bonus baby Ronald Guzman, and for much of the year, had pitcher C.J. Edwards, the headline prospect in July’s Matt Garza trade.

While all of those players (and relievers Alex Claudio and Jose Leclerc) hold considerable intrigue on their own, there was no 2013 Crawdad who left a stronger positive impression on me than outfielder Nick Williams.

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