3 Impact Fantasy Baseball Prospects To Stash - Robby Snelling, Miguel Ullola, Joshua Baez

April 30, 2026

Three top fantasy baseball prospects - Robby Snelling, Miguel Ullola, Joshua Baez - that can make big impacts. These MLB prospects are waiver wire pickups or stashes.

Every season, managers see high-impact prospects not only earn the call to the major league,s but also provide immediate fantasy upside. Through the pening month of the 2026 season, players like Payton Tolle, Noah Schultz, and Parker Messick are among the top rookie performers.

In this piece, we will look at three prospects who are showing high upside at the Triple-A level and could be nearing their MLB debuts.

Should fantasy managers stash these high-end prospects? Let's dive in!

Robby Snelling, SP, Miami Marlins

Current Level: AAA
Availability: 10% rostered
2026 AAA Stats: 24 IP, 2.25 ERA, 1.04 WHIP, 35 SO, 14 BB

Snelling has been nothing short of incredible since making his Triple-A debut last summer and has continued to pitch at an elite level in 2026.

Through his first four starts of the Jacksonville season, Snelling has tossed 19 innings with a 1.89 ERA and a 0.95 WHIP. The southpaw has struck out 31 hitters and allowed just nine free passes. While he has gone five innings or more in only two starts, both have been his most recent outings, which is an excellent sign.

Last summer, Snelling looked just as comfortable during his first stint with Triple-A, holding a 1.27 ERA with a 0.98 WHIP over 63 2/3 innings. During this stint, he showed impressive strikeout upside, totaling 81 while walking just 17 hitters. Early in the season, he actually had less success against Double-A hitters, posting a 3.61 ERA over 72 1/3 innings.

While Garrett projects to be the "next man up" in Miami, Snelling should be right behind him. His strikeout upside is elite and could provide the highest upside on a per-start basis among any of the pitchers on this list. Given his current trajectory, he could debut before the end of May. While the Marlins rotation is filled at the moment, any sudden injury could easily pave the way for both Garrett and Snelling to have a look.

Robby Snelling elevates with a 97 mph fastball for his ninth strikeout tonight.

He’s gone six shutout innings on two hits and one walk. Eleven straight scoreless innings and counting.#Marlins pic.twitter.com/KhKSUFTo9t

— Fish On First Prospects (@FOFProspects) April 18, 2026

-Written by Andy Smith

Miguel Ullola, SP, Houston Astros

Current Level: AAA
Availability: 5% rostered
2026 AAA Stats: 19 IP, 5.68 ERA, 1.42 WHIP, 28 SO, 13 BB

With several of our repeating names now graduated from the stash list, we had to dig a bit deeper in this edition. One name to keep an eye on is Houston's Miguel Ullola. The Houston rotation is decimated with injuries right now as Hunter Brown, Cristian Javier, and Tatsuya Imai are all on the injured list, leaving Mike Burrows, Spencer Arrighetti, and Lance McCullers Jr. as the only "proven" options in the current staff.

As a result, any pitching prospect in their system who is nearing their MLB debut is worth paying attention to. While their system is not known for its pitching depth, Ullola is taking some strides at Triple-A Sugar Land and could emerge as a top reinforcement.

Last summer, Ullola (the No. 11-ranked prospect in the system) spent all of his time in Triple-A and posted a 3.88 ERA and 1.35 WHIP over 113 2/3 innings. While he managed to strike out 131 hitters, he walked 78 of them.

Miguel Ullola (@ProspectsLive No. 8 Astros prospect) turned in the best start of his Triple-A career tonight. He was 92-95 with the fastball with life at the top and the curveball was his best secondary pitch in the low to mid 80s. Generated 10 whiffs in total. Really impressive… pic.twitter.com/bo7YAi041U

— Will Thompson (@will_thompson33) May 2, 2025

Fortunately, Ullola has improved his command in 2026, which is a great sign for his impending promotion. Through four starts with Sugar Land this season, Ullola has walked two or fewer batters in two of them and has never walked more than three in a single game. During these four outings (16 1/3 innings), he has held a 3.31 ERA while posting an elite 13.2 K/9.

The strikeout potential is there; he just needs to continue to strengthen his command. Once this is improved, Ullola could be on the way to Houston much sooner than expected.

- Written by Andy Smith

Joshua Baez, OF, St. Louis Cardinals

Current Level: AAA 
Availability: 5% rostered
2026 AAA Stats: 23 G, .236/.333/.506, 4 2B, 6 HR, 5 SB

108.5 mph | 435 ft. on this tank from MLB's No. 76 prospect Joshua Báez!

The @Cardinals 22-year-old has homered in back-to-back games for the Triple-A @memphisredbirds twice in the span of two weeks: pic.twitter.com/WpRKpgdbzk

— MLB Pipeline (@MLBPipeline) April 23, 2026

Unlike Made, Baez is much closer to the big leagues, currently in his age-22 season. The Cardinals outfielder is currently slashing .230/.345/.486 with five home runs and five stolen bases in 87 plate appearances at Triple-A.

While you don't like the 29.9% strikeout rate, it's nice to see the 10.3% walk rate. But the main here is the power and speed combo, as Baez can play at a 20+ HR, 40+ SB pace whenever he gets the call to the big leagues.

The Cardinals are in rebuilding mode, so eventually they're going to want to see what they have in Baez. This team has Nathan Church in left field and Victor Scott II in center, while Lars Nootbaar remains on the injured list. In other words, there aren't too many entrenched players blocking Baez from getting playing time.

This is exactly the type of profile and situation that you want to target as a stash. There's a wide-open opportunity for a fantasy-friendly profile. Once Baez gets called up, he'll become a priority pickup in all formats. I'd say that he's up around June 1, so make sure to add him to your watch list.

- Written by Frank Ammirante

2026 Prospect Fantasy Baseball Redraft Stash Rankings

Who are the top fantasy baseball prospects to know? Check out our latest 2026 prospect fantasy baseball rankings which are updated regularly by Eric Cross:

Promoted Last Week: Payton Tolle (BOS)

Promoted This Week: Trey Yesavage (TOR), Travis Bazzana (CLE), Elmer Rodriguez (NYY)

Honorable Mentions (Hitters): Lazaro Montes (SEA), Harry Ford (WAS), Ryan Clifford (NYM), Kemp Alderman (MIA), Esmerlyn Valdez (PIT), Gabriel Gonzalez (MIN), Zac Veen (COL), Deyvison De Los Santos (MIA), Hector Rodriguez (CIN), Michael Arroyo (SEA), Jonathon Long (CHC), Blaze Jordan (STL), Jacob Melton (TBR)

Honorable Mentions (Pitchers): Gage Jump (ATH), Carlos Lagrange (NYY), Hagen Smith (CHW), Jaxon Wiggins (CHC), Trey Gibson (BAL), Brody Hopkins (TBR),  Kendry Rojas (MIN), River Ryan (LAD)

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2026 Player Decisions. Looking to pick up someone else instead? Today's focus is on specific players like Max Clark, Robby Snelling, Joshua Baez, Bryan Rocchio, Josh Jung, James Tibbs III. These are some common searches for 2026 fantasy baseball waiver wire pickups.

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Looking to pick up someone else instead? Below are some popular searches and comparisons from our Who To Pickup tool for 2026 for players like Max Clark, Robby Snelling, Joshua Baez, Bryan Rocchio, Josh Jung, James Tibbs III:

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