Pittsburgh Pirates 2015 Top Prospects: #15 – Trey Supak

The Pirates Prospects 2015 Prospect Guide is now on sale. The book features prospect reports on everyone in the system, the 2015 top 50 prospects, and the most comprehensive coverage of the Pirates’ farm system that you can find.  While the top 50 prospects are exclusive to the book, we will be releasing the top 20 prospects over the next few weeks.  Be sure to purchase your copy of the book on the products page of the site.

To recap the countdown so far:

20. Luis Heredia, RHP
19. JaCoby Jones, SS
18. Willy Garcia, OF
17. Clay Holmes, RHP
16. Gage Hinsz, RHP

We continue the countdown with the number 15 prospect, Trey Supak.

15. Trey Supak, RHP

Trey Supak signed for $1 M.
Trey Supak signed for $1 M.

The Pirates took two over-slot prep pitchers in the second round, selecting Mitch Keller with their actual second round pick, and Trey Supak with their supplemental draft pick a few spots later. Both pitchers received a $1 M signing bonus, although there was a clear difference between the two.

Supak possesses a lot of the traits that make Keller a top prospect. He’s a tall, projectable right-hander who can already hit 94 MPH, with the potential for two average off-speed pitches. Supak has more projection in his frame than Keller, but falls behind Keller at the moment with his present velocity.

While Supak can hit 94 MPH, he mostly works in the 88-92 range. He sits 90-91 early in the game, but loses his velocity as the game goes on. As he fills out his frame and adds strength, he could maintain his velocity in the later innings. Until then, his upside is going to involve a bit more projection than Keller.

Supak’s fastball command was inconsistent in his pro debut, leading to poor results. He had issues leaving his fastball up in the zone at times, which led to him getting hit hard. He can locate the ball down in the zone at times, but needs to learn how to do that on a more consistent basis.

The off-speed stuff could also show improvements. His current projection limits his upside to a number three or four starter. If he can develop an above-average off-speed pitch, and fill out his frame to get more consistent velocity, then he could improve his upside, becoming a solid middle of the rotation starter or better.

The Pirates have sent their prep pitchers to Bristol or returned them to the GCL in the last few years, taking a more conservative approach than a few years ago when it would be automatic that their top prep pitchers would go to the New York-Penn League during their first full season. Supak’s bonus suggests that he could get that aggressive push to Morgantown, but his current stuff would probably be better off with a more conservative push to Bristol. That could change if he sees a lot of strong developments during extended Spring Training, especially with the quality of his changeup and the command of his fastball.

Click Here to Purchase the Pirates Prospects 2015 Prospect Guide

Tim started Pirates Prospects in 2009 from his home in Virginia, which was 40 minutes from where Pedro Alvarez made his pro debut in Lynchburg. That year, the Lynchburg Hillcats won the Carolina League championship, and Pirates Prospects was born from Tim's reporting along the way. The site has grown over the years to include many more writers, and Tim has gone on to become a credentialed MLB reporter, producing Pirates Prospects each year, and will publish his 11th Prospect Guide this offseason. He has also served as the Pittsburgh Pirates correspondent for Baseball America since 2019. Behind the scenes, Tim is an avid music lover, and most of the money he gets paid to run this site goes to vinyl records.

Support Pirates Prospects

Related articles

join the discussion

Oldest Most Voted
Inline Feedbacks
View all comments

John, would you say at 18 both of these guys are ahead of Heredia when he was 18?

John Dreker

I don’t think so. Heredia was impressing scouts at 18 in the NYPL and getting fantastic reports from the ones I talk to. He just hasn’t gone anywhere in the last two years

John Dreker

You can see a couple GCL videos of Supak(and Mitch Keller) here


John: Supak was a very young HS Senior. In fact, the Pirates seem to look at that as much as talent. Meadows and McGuire were young HS Seniors last year, and Tucker, Supak, Hinsz, and Keller were all young HS Seniors in their draft year. With parents starting to hold back their male children, we have seen a lot of HS Seniors that were already 19 before the draft. Means the Bucs get that extra year of professional development.

John Dreker

Nick Buckner was also young for his class last year, though Trae Arbet was old for his class and they seemed to miss on him. Arbet was drafted in 2013 and is already five months away from his 21st bday.


Arbet was one of those guys that when they get drafted they are already in their age 19 season. This is one of the guys I could not understand, along with Connor Joe in 2014, who although being drafted as a Junior out of college in 2014, will already be in his age 23 season in 2015, and he has not hit a lick since signing his name. I know he is listed as our #29 Prospect, and we gave him $1.25 mil to sign, but this kid has to be a starter on the MLB All-Phantom Team.


There it is! I missed this. Last week was a long week without the rankings. Also what’s the difference between Jamestown and Bristol as far as development?

John Dreker

Bristol is a level below Jamestown/Morgantown, younger, less experienced players. It’s an advanced rookie league. Average age in the NYPL was 21.3 in 2014, the Appalachian League was 20.4


Very detailed as always. Are the GC, Jamestown and Bristol are short seasons? Is there that big a difference in whether Supak for example goes to Jamestown over Bristol?

John Dreker

They are all short-season teams. If he went to Bristol, he would be seeing more 2nd year HS kids, lower talent college players and players in their 1-2 years out of the Dominican Summer League. In Morgantown(Pirates moved for 2015) he would be seeing better college players. It is definitely a step up in talent.


Thanks. I forgot about the move and got a little confused there.

Share article

Pirates Prospects Daily

Latest articles

Pirates Prospects Weekly

MONDAY: First Pitch

TUESDAY: Article Drop


THURSDAY: Roundtable

FRIDAY: Discussion

SATURDAY: Pirates Draft Report

SUNDAY: Pirates Business

Latest comments