Fish On First is publishing weekly Miami Marlins minor league summaries throughout the 2025 season, covering the progress of FOF Top 30 prospects and lesser-known players in the organization who are worth monitoring. Each full-season MiLB affiliate has its own section below.
Player stats are up to date entering May 29.
Triple-A Jacksonville
The Jumbo Shrimp came out victorious just twice in five games last week against the Memphis Redbirds, but seem to be back on a winning track after taking both games in Wednesday’s doubleheader against the Gwinnett Stripers.
Game one of the twin bill featured Eury Pérez making his seventh rehab start and second in Triple-A. To put it bluntly, Pérez dominated.
The 22-year-old cruised through five innings, striking out four on 72 pitches. The only blemishes on Pérez’s line were a lone hit and walk. It’s safe to assume that Pérez, a little over a year removed from Tommy John surgery, will make at least one more start in Jacksonville. If Miami’s front office decides that their prized arm is good to go, Pérez could debut some time during the next road trip, either in Tampa or Pittsburgh.
Other Marlins big leaguers Dane Myers, Xavier Edwards and Declan Cronin are rehabbing alongside Pérez in Jacksonville as well. Edwards is serving as the designated hitter on Thursday, but he is in the midst of transitioning from shortstop back to second base.
Looking back to last week, Shrimp bats struggled, only averaging three runs a game. Jack Winkler and Heriberto Hernández were responsible for six hits—half of which left the yard—and an additional double each. While they are on the older side, they are comfortably above average offensively by International League standards, both with an OPS north of .760.
Double-A Pensacola
Saying Pensacola slumped over the past week and a half would be a disservice. The Wahoos dropped all six of their games against Birmingham and continued their streak in games one and two in Montgomery, falling 8-1 and 3-1, respectively.
A pivotal force behind their struggles has been offensive production. Among all seven qualified hitters, not one OPS’d higher than even .560, with Kemp Alderman getting the closest with a .554 mark.
Notably, Jared Serna continued his near season-long slump, recording just three hits in 26 at-bats. Serna’s BB/K ratio hasn’t seen any drastic changes from a season ago—24/29 in ‘25 compared to 56/101 in 2024—but the highly regarded prospect from the Jazz Chisholm Jr. trade has simply been unable to hit for any power at a consistent rate. The 5’7″ 22-year-old has just four extra-base hits in nearly two months of action. Again, looking back to a season ago, Serna recorded five of those within his first five games in the Marlins organization.
The lone bright spot from northwest Florida during this lull has been on the mound in Robby Snelling.
Fish On First’s #6 prospect earned Southern League Pitcher of the Week honors, as Snelling authored a six-inning, two-hit performance. Snelling didn’t stop there, riding the momentum into his next outing against the Biscuits on Wednesday, tossing a career-high seven innings. The premier prospect in last July’s Tanner Scott deal punched out six and displayed incredible command, throwing 60 strikes on 89 pitches.
Following both gems, Snelling’s season ERA sits at an even 4.00. A promotion a couple hours east to Jacksonville has seemed overdue for a little while now.
High-A Beloit
It was a long week for the Sky Carp who endured a rain delay, a doubleheader, and overall a series loss to the Quad Cities River Bandits.
One highlight in the series was lefty Emmett Olson who pitched in the completion of the first game of the series, a game that was suspended on April 20. Entering in the fifth inning, Beloit was down 3-2. Olson restarted the game for the Carp and turned in five innings of one run ball on five hits and just one earned run. He struck out a career-high 10 batters.
The 6’4”, 230 Olson is a master at changing eye levels with a 12-6 curveball and a rising fastball. Most encouraging about this outing was how Olson used his slider specifically throwing it away from same-side hitters and for punchouts. His MO has been to use the breaking stuff early and the fastball late. Showing new ways to mix his stuff is a great development.
Payton Green continues to succeed in the middle of the Sky Carp order. After a strong series against Wisconsin, he went 7-for-10 in his first three games in this series to accomplish an 11-for-20 stretch. He’s hitting .346/.402/.531 this month, his first month at the High-A level.
Coming out of the draft, one of the biggest knocks on Green was his ability to stay consistent with the bat. Streaks like this at the highest level of baseball he’s ever appeared at will work to his advantage. Most evaluators think that he will also eventually move off of shortstop to third base where a good arm and just average range will serve him better, but he’s looked the part so far at short where he’s spent the entire season. He’s contributed to 14 double plays and committed just a single error. If he continues to perform, this is a prospect that will start to get the attention he hasn’t gotten much of thus far.
Karson Milbrandt continues to perform week over week. After going 3.2 IP in his last start, Milbrandt completed four innings in this series while striking out six. He allowed three hits and a single walk. Milbrandt continues to be built back up after injury early this season. His ability to recover quickly and improved command with an increase in fastball velo has been a huge catalyst for early success. After he struck out his six in that start on May 23, the Sky Carp bullpen struck out an additional 11.
Top prospect Thomas White was once again absent from a scheduled start in this series, his second straight missed outing. Our Isaac Azout cleared up that conundrum: White is dealing with a minor finger injury. While the timeline for his return is unknown, White is on a throwing program.
Low-A Jupiter
It was an up-and-down series for Jupiter against St Lucie this past week. Though they were well outscored 30-17, they managed to split a six-game series.
Overall, it’s been a rough start for Andrés Valor, but he started to show some consistency in this series in terms of contact rates. He went 5-for-21 including his second home run of the season and his fourth double. At the time of publication midway through Thursday’s contest, Valor has just reached another Low-A milestone by recording multiple extra-base hits in the same game.
Though he still needs to get his swing decisions in check overall, seeing Valor show the ability to start to do so is encouraging. With improved patience and barrel control, Valor—still 19—has standout physical projection and athleticism. Whether or not he maintains this recent consistency will be something to watch as we go through the rest of the Hammerheads’ schedule.
2024 draftee Cam Clayton got his call to the Hammerheads at the back end of last series and started three games against St. Lucie. He made a pretty good first impression with Jupiter, homering in his second game and tripling in his fourth.
Impact with the bat as he rounded out his collegiate career was the question for Clayton. Initial exports with Jupiter are good, but we will have to see how that matriculates as he gets more familiar with the league.
A defensive star at the University of Washington, Clayton was drafted as a shortstop and did play one game of this series there with Jupiter, but he’s also spent time at 1B, 2B and DH. The Marlins’ development team appears to be trying to take some pressure off of Clayton’s bat by moving him around to less demanding positions. Even with Starlyn Caba still sidelined due to injury, the Hammerheads have a glut of SS options, including Andrew Salas and Carter Johnson.
Already 22, Clayton could be pushed quickly. Look at him right now as a defensive-first asset with some holes to fill in his swing, particularly related to length and timing.
FCL Marlins
It’s been a rough go lately for the FCL squad which has lost five straight games. That said, they still remain one of the most base stealing savvy teams on the circuit—they are second in the FCL with 48 bags.
The team’s top offensive performer to this point in the season has been 2024 ninth-round draftee Dub Gleed. Slashing .250/.467/.365, Gleed is boasting good plate vision. In 11 games, he has eight hits: four singles and four doubles.
Coming out of the draft, Gleed was lauded for his ability to work counts and show good patience while needing to translate raw power to game power. He will also need to find a permanent defensive home. Miami is hoping he works out at 3B (he’s spent all his time there so far as a pro).
While this initial small sample is solid, Gleed is 22, so we will need to see how his offensive skill set persists against more age-appropriate competition. He was promoted to Jupiter on Thursday.
Another 2024 draftee showing solid initial results as a pro is 18th-round pick Nate Payne. A lefty, Payne has held down a sub-3 (2.53) ERA in his first 10 ⅔ innings. The 19-year-old Pennsylvanian is much closer to the average age of his FCL peers.
Payne averages middling velocity, but he makes up for it with good movement on his heater and a pretty deep arsenal, especially for his age. He’s already throwing four pitches: fastball, changeup, curveball, and slider. His best offering is likely his bender which shows nice velo separation and tight arc. It’s been a big catalyst for his success so far, per sources we’ve heard from out of the FCL. With limited size and still a bit to work out in terms of consistent command and control, Payne has reliever risk, but he’s off to a solid start in limited showings.
Next Up (May 29-June 1)
Triple-A Jacksonville at Gwinnett
Double-A Pensacola at Montgomery
High-A Beloit at Lansing
Low-A Jupiter vs. Daytona
Interested in learning more about the Miami Marlins’ top prospects? Check out our comprehensive top prospects list that includes up-to-date stats, articles and videos about every prospect, scouting reports, and more!