After taking the college bat that many predicted they were after, North Carolina infielder Colin Moran, the Marlins used their next pick in the Competitive Balance Round A to take prep lefty Matt Krook from St. Ignatius High in California.
Krook is a 6-foot-2, 190 lbs. southpaw who features a good fastball that sits in the low-90s and a hard, biting curveball. His changeup remains a work in progress, so it's going to be his breaking ball that will be the key to his success early on.
There isn't all that much video available of Krook pitching on the Internet, but from what I've seen so far it looks like there is room to make some mechanical adjustments due to a high-effort delivery.
The great Chris Crawford of MLB Draft Insider had this to say about Krook in his annual Draftbook:
Krook was one of the bigger "pop-ups" of the draft, and at one point looked like he was heading towards being picked in the first dozen selections. Since then the results have been inconsistent, but a team looking for a southpaw with a potential plus fastball and plus-plus curveball should look no further than him. Expect to see Krook taken sometime in the first 50 selections, maybe even the first round.
Krook is currently committed to play at the University of Oregon but my guess is that the Marlins wouldn't have taken him at this spot if they didn't think they would be able to sign him.
If Krook is added to the fold, the Marlins would boast a trio of solid left-handed pitching prospects in Krook, Justin Nicolino, and last year's first round pick, Andrew Heaney. Left-handed starting pitching is always a nice commodity to have, especially if you're trying to rebuild your major league team.
Krook is still raw so if he signs, the organization is going to take things slow, and not try to rush his development. If he's able to make the necessary mechanical adjustments and develop a good feel for his changeup and command, Krook could soon become the club's best pitching prospect.
Here's the best video I've found of Krook that gives you a good idea of what his delivery looks like.
Matt Krook - LHP #13 St Ignatius HS -San Francisco, CA - Warm Up between Innings (via oldschoolbaseball16)