Okay, so there's a good number of places out there that have released some prospect rankings.
John Sickels Minor League Ball
Kiley McDaniels Fangraphs
MLB Prospect Rankings
Baseball America
Baseball Prospectus
I don't have a BA or BP subscription, but I wouldn't mind doing a month subscription if it would help. I do have a Scout subscription. Obviously I can't share any info behind the pay wall but the info there is good and is certainly playing a role in my rankings here.
So without further ado, here are my preliminary rankings (only possible A/B for now) for OSFM. Hopefully we can all have some good discussion and adjust as necessary.
SP Luis Severino (A-/B+)
(89)
I know Law doesn't like his stride but a number of other sources disagree. Obviously he isn't a finished product, but the stuff is there and so far the production is as well.
OF Aaron Judge (B+)
(88)
One of the higher ceiling prospects in the system, he’s looking to be more of a hitter than “just” a slugger. The tools are there, he’s reaching the upper minors, and if he can keep progressing he looks like a possible All-Star RF with 30+ HR potential.
1B Greg Bird (B+/B)
(86)
Limited athletically/defensively, he’s a polished hitter with patience and power. So far it looks like his advanced approach and above average power will carry him to the majors (at least if he can stay healthy).
RP Jacob Lindgren (B+/B)
(87)
The recent draftee soared quickly through the system and has closer upside. The potential rating for OSFM doesn’t need any sort of positional adjustment like other rankings, so I could see him being a high B.
2B Rob Refsnyder (B)
(83)
The bat has played, no doubt about it. He’s put up good numbers at the highest level of the minors and (offensively at least) looks like he could compete for a spot this spring. The big question is the defense. Reportedly he’s making strides, he just needs to keep improving so he’s at least average at 2B.
C Gary Sanchez (B)
(82)
Some are souring on Sanchez, but he did just put up a .270/.338/.406 line with 13 HRs while catching as a 21 year old in AA. He’s got the arm to stay at catcher and more athleticism than Montero, but there are a number of question marks. The potential is still there, it just depends what he makes of it.
SS Jorge Mateo (B/B-)
(82)
He certainly has a high ceiling, but he’s pretty far away and hasn’t started playing in full season leagues yet. May want to go with a B- due to the uncertainty.
C Luis Torrens (B-)
(80)
Much more advanced defensively, he has a solid offensive ceiling as well. Maybe a safer bet to stay at C than Sanchez, but certainly doesn’t have the same power potential.
SP Ian Clarkin (B-/C+)
(80)
A polished lefty with three solid pitchers, he could end up being a really decent mid-rotation starter.
3B Eric Jagielo (B-/C+)
(78)
Injuries and defensive questions have lowered his stock a bit, but he has nice power from the left side and is supposed to be fairly polished offensively.
3B Miguel Andujar (B-/C+)
(77)
Another younger guy, he supposedly profiles better at 3B defensively than Jagielo. He finished last year strong offensively, could be a good overall third baseman.
OF Tyler Austin (B-/C+)
(78)
He hit very well in the second half of last year as he moved farther away from his wrist injury. If he can keep that going he probably goes back to one of the better prospects in the system and could even compete for a position in the majors next year.