MLB Prospect Debuts: Fantasy Baseball Waiver Wire Pickups and Rookie Stashes (Week 5)

April 29, 2026

Marty's fantasy baseball prospect stashes, sleepers, and rookie waiver wire pickups for Week 5 of 2026 -- recent MLB prospect debuts and potential call-ups to monitor.

As May approaches, sample sizes are becoming large enough to start making roster moves without being overly reactionary. This week, we highlight two hitters and two pitchers who are expected to make an impact at some point this season in redraft leagues. Over the last few weeks, this article has anticipated the call-ups of Payton Tolle (BOS), Travis Bazzana (CLE), Didier Fuentes (ATL), and JR Ritchie (ATL). Hopefully, this column can continue the hot streak.

As a rule of thumb, as you comb through prospect rankings and statistics, be sure to take into account how each MLB team is performing, as well as any relevant injuries. For obvious reasons, a team may be more inclined to rush a prospect up because the team is playing poorly. However, keep in mind that just because a player gets called up from the minors, that does not mean he is going to stay up.

Last week, we saw pitcher Kendry Rojas (MIN) get called up to the majors, only to be sent back down shortly afterward. So, in other words, make sure you are studying the team's major league roster before you pick up or stash a prospect. Each player featured here is rostered in fewer than 60% of Yahoo! leagues. If you have any questions or comments, feel free to reach out on X @Marty_Tallman. Now, let’s dive into this week’s promising prospects!

Fantasy Baseball Hitter Prospects To Target

Emmanuel Rodriguez, OF, Minnesota Twins (1% rostered)

Level: Triple-A

2026 Stats: 93 PA, .239/.409/.451, 12R, 4 HR, 14 RBI, 3 SB, 20.4 BB%, 30.1 K%, 131 wRC+

This week, we begin in St. Paul, Minnesota, home of the Twins’ Triple-A affiliate, the St. Paul Saints. Outfielder EmManuel Rodriguez has a very fantasy-friendly profile because he blends on-base ability, power, and speed. However, much like his teammate and fellow top prospect Walker Jenkins, staying on the field has been a consistent challenge. The 23-year-old left-handed hitter from the Dominican Republic has appeared in just 112 games over the past two seasons due to thumb, hip, and oblique injuries.

For fantasy, he projects to be a 25-home-run, 10-stolen-base outfielder with a high on-base percentage. Last season, Rodriguez walked 20.6% of the time, helping to balance out his 31.8% strikeout rate. He also slashed .269/.431/.409 with six home runs and 10 stolen bases across 267 plate appearances. So far this season, he has been able to stay healthy, and it's showing in his hard-hit metrics.

Earlier this month, he crushed a ball 117.1 mph, which would rank as the third hardest hit ball in MLB, sandwiched between Yordan Alvarez (117.8 mph) and Junior Caminero (116.9 mph).

117.1 mph
426 feet 🚀

MLB's No. 66 overall prospect EmManuel Rodriguez (@Twins) obliterates his fourth homer of the season for the Triple-A @StPaulSaints. pic.twitter.com/0EBDrmE12O

— MLB Pipeline (@MLBPipeline) April 18, 2026

In the Twins’ outfield, Minnesota currently features Trevor Larnach, Matt Wallner, and Byron Buxton, with Austin Martin as a short-side platoon option against lefties. Buxton will play as much as his health allows, but that is far from a guarantee. Meanwhile, left-handed slugger Wallner is currently struggling, slashing .186/.278/.314 with a 38.1% strikeout rate and a 68 wRC+ across 97 plate appearances.

While Wallner likely has a long leash due to his one remaining minor league option, his inability to make consistent contact could lead to an eventual demotion or reduced role. With that said, the Twins could opt to call up fellow outfielder Jenkins instead, but he’s currently struggling in Triple-A, posting a 75 wRC+ across 84 plate appearances. Historically, the Twins have been cautious with promoting corner outfield prospects, though Rodriguez could still earn a call-up by June if he stays healthy and continues to produce.

Rodriguez is worth monitoring in 15-team, five-outfielder leagues. If he is called up, he should be added immediately. In shallower leagues, however, you can take a wait-and-see approach to make sure he is worth the roster spot.

Kaelen Culpepper, SS, Minnesota Twins (1% rostered)

Level: Triple-A

2026 Stats: 107 PA, .234/.327/.372, 16 R, 3 HR, 13 RBI, 5 SB, 11.2 BB%, 21.5 K%, 85 wRC+

The Twins’ No. 4-ranked prospect, Kaelen Culpepper, is one of the most well-rounded infielders in the system, and no, he is not related to former Minnesota Vikings quarterback Daunte Culpepper. He does, however, feature an advanced hit tool and has produced at every level of the minors. Offensively, the 23-year-old out of Kansas State brings a polished approach and strong bat-to-ball skills, allowing him to make consistent contact while limiting strikeouts.

Across High-A and Double-A last season, Culpepper slashed .289/.375/.469 with 20 home runs, 16 doubles, and 25 stolen bases, while posting a 17.4% strikeout rate and a 9.7% walk rate, good for a 138 wRC+. Although he hasn’t fully broken out in Triple-A this season, he appears to be heating up after snapping out of a slump with a two-homer game.

Two-homer game for Kaelen Culpepper, and it's only the 4th 😲

Watch the @Twins prospect in the Free Game of the Day with the @StPaulSaints.

LIVE: https://t.co/jN1BtVkGl5 pic.twitter.com/djLSFijy2R

— Minor League Baseball (@MiLB) April 28, 2026

Here’s a breakdown of his Triple-A season so far from a Statcast perspective. Notice the consistent red throughout his hard-hit metrics and speed.

Defensively, Culpepper offers quick feet, a strong arm, and solid instincts. Although scouts have debated whether he will remain at shortstop or eventually move to second or third base, he projects as an above-average everyday infielder either way. At the big-league level, the Twins’ infield features Brooks Lee, Luke Keaschall, Royce Lewis, and utility option Tristan Gray. Lee, Lewis, and Gray have been above-average hitters so far, while Keaschall has struggled with a 44 wRC+.

Lewis, despite his production, has also dealt with recurring injuries and remains just one soft-tissue issue away from another IL stint. If Keaschall continues to struggle, he could be optioned, given his remaining three minor league options. Meanwhile, although Gray has been productive in a limited role, posting a 115 wRC+ over 50 plate appearances, he is still a 30-year-old former 13th-round pick with a career 30.3% strikeout rate across 172 MLB appearances, making it unlikely he would keep Culpepper down.

In shallower leagues, Culpepper may not move the needle immediately, but in 15-team formats, he is worth monitoring closely. He profiles as a solid middle-infield option once called up. Keep a close eye on Keaschall’s performance and Lewis’ health, as any instability could open the door for Culpepper as early as late May or June.

Fantasy Baseball Pitcher Prospects To Target

Robby Snelling, SP, Miami Marlins (9% rostered)

Level: Triple-A

2026 Stats: 24 IP, 2.25 ERA, 1.04 WHIP, 37.2 K%, 14.9 BB%, 3.32 FIP

Left-hander Robby Snelling is arguably the most popular “must-stash” pitching prospect in fantasy baseball, and for good reason. Across Double-A and Triple-A last season, Snelling posted a 2.72 xFIP with an impressive 30.3% strikeout rate, a solid 7.1% walk rate, and a 50.8% ground-ball rate over 136 innings. The 22-year-old ranks as the No. 2 overall prospect in the Marlins’ farm system, just behind fellow southpaw Thomas White.

At 6’3”, 210 pounds, Snelling has the build of a middle linebacker, giving him an imposing presence on the mound. This year, he’s been even better in Triple-A, posting a 2.88 xFIP alongside an 37.2% strikeout rate. While his 14.9% walk rate is certainly concerning, his elite ability to miss bats combined with a 55.6% ground-ball rate helps offset some of that risk. Simply put, there’s very little left for him to prove in the minor leagues, and much of that success comes from his deep and versatile arsenal.

Another gem for Robby Snelling 💎

The @Marlins' No. 2 prospect strikes out 9 over 6 scoreless innings, lowering his ERA to 1.89 and WHIP to 0.95 across four starts for the Triple-A @JaxShrimp. pic.twitter.com/8lIqfKZmyk

— MLB Pipeline (@MLBPipeline) April 18, 2026

Snelling features a four-pitch mix and displays above-average command for his age, highlighted by a plus curveball. On the downside, he lacks a true elite offering, and his fastball can be hittable at times. His changeup is serviceable but remains a work in progress. Ultimately, his long-term success will depend on maintaining consistent command, but he has already shown the ability to sequence his pitches effectively and keep hitters off balance.

Another feather in his cap is that LoanDepot Park is one of the friendlist pitchers parks in baseball. Over the past two seasons, the Marlins stadium has ranked as the sixth-most pitcher-friendly venue in baseball, with a Statcast Park Factor of 96 (where 100 is league average). Plus, the team is finally winning some games. As it stands, Miami sits at 13–14 with a 104 wRC+ offense. So, when should we expect Snelling in the majors?

While most of the rotation has performed well, veteran starter Chris Paddack currently owns a 7.33 ERA across 21 1/3 innings, making a promotion for Snelling a realistic possibility in the near future. Once he’s called up, Snelling should be rostered in all fantasy formats, and if you have the flexibility, he’s worth stashing now to prevent a leaguemate from capitalizing on his upside.

Kade Anderson, SP, Seattle Mariners (4% rostered)

Level: Triple-A

2026 Stats: 18.2 IP, 0.48 ERA, 0.70 WHIP, 44.1 K%, 5.9 BB%, 1.26 FIP

Kade Anderson is another top southpaw prospect who is quickly proving he does not belong in the minors. The Mariners’ No. 3-ranked prospect was selected with the No. 3 overall pick in the 2025 MLB Draft out of Louisiana State University, where he helped lead the team to a College World Series title. During the 2024–2025 college season, Anderson went 12–1 with a 3.18 ERA while leading the nation with 180 strikeouts in just 119 innings.

In Double-A this season, Anderson has carried that momentum forward and has been dominant, striking out 41.5% of the hitters he has faced while posting a 0.64 ERA, 0.86 WHIP, and a 55.6% ground-ball rate.

Another dominant start from Kade Anderson ✨

The @Mariners' top pitching prospect struck out 8 on Friday, lowering his ERA to 0.48 through 4 games for the Double-A @ARTravs: pic.twitter.com/HPl7uUo8no

— MLB Pipeline (@MLBPipeline) April 25, 2026

Anderson works with a four-pitch mix, plus command, and advanced pitchability. He consistently throws strikes and uses a deceptive delivery and arm slot to compensate for average raw velocity. His fastball sits 92–95 mph, while his best pitch is a sharp slider that generates frequent whiffs. His changeup fades just enough to keep right-handed hitters off balance, and he rounds out his arsenal with an average curveball that helps change eye levels.

His biggest limitation isn’t necessarily his ability, but rather the organization he plays for. The Mariners currently boast one of the best rotations in baseball, featuring Logan Gilbert, George Kirby, Bryan Woo, Emerson Hancock, and Luis Castillo, with Bryce Miller (oblique) expected to return from the injured list at some point. The rotation’s lone weak link has been veteran right-hander Castillo. Across 28 1/3 innings, he owns a 6.35 ERA, while his 11.2 K-BB% is by far the lowest of his career.

If that continues, Anderson could earn a call-up sooner rather than later, though that’s difficult to project at this stage. If you need immediate pitching help, consider options like Noah Schultz (42% rostered), Tolle (56% rostered), or Ritchie (26% rostered) instead. However, in deeper formats, Anderson should remain firmly on your radar, and once promoted, he should be rostered in all leagues given his strikeout upside.

More Fantasy Baseball Prospects and Rookies