MLB Pipeline is going through their top 30 prospects lists for each MLB team.
They're about halfway through releasing them all.
Here's how some of the former frogs are ranked.
(They have ETA's for Feltman, Ferrell and Howard for this season.)
http://m.mlb.com/prospects/2019?list=bos
Durbin Feltman | Rank: 12 (Preseason: 12)
Team: Salem Red Sox (A Adv)
ETA: 2019 Position: RHP Age: 21 DOB: 04/18/1997 Bats: R Throws: R Height: 6' 0" Weight: 205 lb. Drafted: 2018, 3rd (100) - BOS
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Scouting grades: Fastball: 70 | Slider: 60 | Changeup: 45 | Control: 55 | Overall: 45
Feltman didn't become a full-time pitcher until his senior season as a Texas high schooler, attracting little attention from scouts but earning a scholarship from Texas Christian. He became the Horned Frogs' closer as a freshman, set a program record with 17 saves as a sophomore and posted a 0.74 ERA and tied another school mark with his 32nd career save last spring. Signed for $559,600 as a third-round pick, he reached Class A Advanced in his debut and is a leading candidate to become the first 2018 draftee to reach the big leagues.
Feltman has a devastating pair of pitches that could make him a closer in the Majors. His fastball combines velocity (95-97 mph to 99) with running action and deception. Batters also have difficulty picking up his mid-80s slider, which has depth and is a wipeout pitch at its best.
In addition to blowing hitters away, Feltman also can throw them off balance with a decent changeup. Though he has three pitches, he's definitely a reliever because he's relatively small and there's effort in his delivery. He's wiry, strong and durable, however, and does a nice job of locating his pitches where he wants.