We initially looked at the top fantasy baseball prospects by position, including starting pitchers and outfielders. Now we’ll examine the top prospects that you likely haven’t heard of that could impact major-league rosters this season.

Luis Severino, RHP, Yankees

At just 6’0” and 195 lbs, Severino is far from an imposing figure on the mound. However, with the recent success of Yordano Ventura and Marcus Stroman, the negative stigma around smaller pitchers is beginning to diminish.

The primary concerns with smaller pitchers are velocity, durability and the plane in which they are able to deliver a fastball. Last year, one of the primary criticisms put on Stroman was regarding his inability to elevate his fastball. This issue was a significant reason that scouts were not optimistic on him surviving as a starter, especially in the hitter-friendly confines of the Rogers Centre.

The same cannot be said for Severino. He does an excellent job of standing tall on the mound and generating solid downward plane on his fastball – enough so that pitching in homer-friendly Yankee Stadium is unlikely to be much of an issue. Also, his velocity is a nonissue – his fastball sits in the 93 to 95 mph range, and can touch 98.

The final concern is durability. Seeing as Severino is just entering the season at the age of 21, he has not yet had a chance to prove long-term durability. This will be something you’ll want to keep an eye on as the Yankees start to ease up his inning restrictions.

Now for the statistics…

In 113⅓ innings in 2014, Severino maintained a sparkly 2.46 ERA across three minor league levels. He was able to achieve such dominant results thanks to his elite 10.09 K/9 and 2.14 BB/9. Strikeout numbers that high with such advanced control are extremely rare for a pitcher as young as Severino. With the Yankees rotation shaping up to be questionable at best in 2015, you can expect to see Severino in pinstripes early this year.

Here’s a look at Severino. His slider is the third pitch of his repertoire, however it features tight, late break and can be lethal when he’s able to locate it effectively.

Dalton Pompey, CF, Blue Jays

Describing Pompey’s rise through the ranks as “meteoric” may be an understatement. After opening the 2014 season playing for the High-A Blue Jays, Pompey ended it by blasting a home run off Felix Hernandez in the big leagues.

Pompey’s best tool is undoubtedly his speed. He possesses outstanding instincts on the base paths and borderline 80-grade speed. Pompey also pairs an extremely advanced approach at the plate with impressive pitch recognition, allowing him to take a lot of walks. These are rare tools for a 22-year-old to possess. It speak volumes to his maturation since being signed when he was just 17 years old. Pompey is a switch-hitter whose swing appears a little more compact and prone to produce higher averages from the left side. He’s a bit longer with better use of the lower half from the right side, likely leading to increased power. Pompey profiles as a Starling Marte-type hitter. Interestingly enough, Marte was the only player in the bigs last year to bat over .290 with double-digit home runs and at least 30 stolen bases. To be clear, I am not predicting a similar season from Pompey this year. However, thanks to his advanced plate discipline and solid contact skills, he should be able to keep his strikeout rate palatable and maximize his on-base opportunities (which is where he will do the most damage).

As the potential leadoff hitter for the Blue Jays, Pompey is in an excellent spot to begin 2015. If he’s able to keep his average in the .250-.260 range (not unlikely), his walk rate should keep his OBP around .350. This would provide a fantastic atmosphere to steal bases and score runs with sluggers Jose Bautista, Edwin Encarnacion and Josh Donaldson hitting behind him.

Here’s a look at Pompey. He may have a short, compact stroke from the left side, but packs the power to drive the ball out in a hurry when he makes strong contact.

Aaron Nola, RHP, Phillies

The reason Nola is not a common household name in the prospect world has little to do with age or taking a few years to develop. Instead, it has to do with the fact that he was drafted just last June, and has pitched only 55⅓ professional innings.

When Nola did pitch, it was obvious that his command is well beyond his age. Throughout his brief 2014 professional season, Nola walked just 10 batters – good for a 1.63 BB/9. Nola’s strikeout levels aren’t elite (7.32 K/9 last year), but they’re unlikely to dip much below 7.00 at any level due to his excellent command and developed arsenal. Nola features a fastball that lives in the 91 to 94 mph range, a curveball that sits in the low 80s, and a changeup which comes in at 83-85 with tailing life. However, the effectiveness of his pitches go much beyond the velocity. His impeccable command allows him to get ahead in counts and generate weak contact. As Nola progresses, his slider could develop into his primary out pitch, as it already has been missing bats at an impressive clip.

After Cole Hamels and Cliff Lee, the Phillies’ projected rotation is full of nothing but question marks. With Philadelphia certainly not looking to contend this year, it would make sense to give Nola a taste of MLB action sooner than later. After all, they did promote Nola to Double-A after just 31⅓ innings pitched at the High-A level last year. You can expect to see Nola in a Phillies’ uniform by June at the latest, and he could make a real impact when he gets the call.

Here’s a look at Nola. His slider provides an out pitch against right-handed batters, and his ability to locate it makes it a viable option versus lefties as well.

Kyle Zimmer, RHP, Royals

Kyle Zimmer is a name that floated around prospect circles prior to the 2014 season. The substantial hype that was building around him has almost completely dissipated due to an injury plagued 2014. However, in dynasty formats Zimmer has just as much upside as nearly any other pitcher. The discounted price that he is currently available at represents great value, especially considering that a mid-season call up in 2015 isn’t completely out of the question.

Despite the injuries, Zimmer has one of the most electric arms in all of the minor leagues. His repertoire is absolutely lethal. Zimmer’s primary pitch is a fastball that regularly registers in triple digits and sits in the mid-to-upper 90’s. His secondary stuff consists of a plus-plus curveball, a plus changeup, and an average slider. His curveball features an 11-5 break, and comes in around 80 mph with excellent depth. The change up tails late and lives in the mid 80s. Finally, Zimmer brings in his slider around 85 mph with strong break, but he needs to locate it more effectively for it to become a viable MLB pitch.

With such high-powered stuff, Zimmer has made minor league hitters look silly on a regular basis. In his minor league career, he has struck out 199 while walking only 52 in 162⅓ innings. That resulted in an 11.03 K/9 and 2.88 BB/9. Pitchers who produce numbers like this don’t come around too often, and if he shows to have recovered from surgery adequately, I wouldn’t be shocked to see him sending big league batters back to the dugout in July.

Here’s a look at Zimmer. His 11-5 curveball has been effective against both right and left-handed hitters and has generated more strikeouts than any of his other off-speed offerings.

Read Part 2: Fantasy Baseball Prospect Sleepers

Bobby Jacowleff is a correspondent at FantasyPros. To read more from Bobby, check out his archive.

