Breaking Down the Miami Marlins' Top Prospects

The Miami Marlins are a team on the rise, and parts of their future are expected to debut in 2026.

As of last August, MLB.com had the Marlins' system ranked No. 13.

The full system rankings for 2026 aren't out yet, but Miami's top four prospects are clear.

Three of them are on the verge of making their debuts, and the other just entered the organization over the summer.

Here's a breakdown of Miami's top four prospects.

Marlins prospect ranking: No. 1

Overall ranking: No. 22

The big lefty (6-foot-5, 240 pounds) is Miami's top prospect. White, a 21-year-old who the Marlins drafted 35th overall in 2023, is expected to make his big-league debut in 2026, assuming all goes well in AAA Jacksonville. Considering White was lights-out in AA (1.59 ERA in 10 starts in 2025) and High A (2.83 ERA in nine starts), there's no reason to think he won't keep it up in Jacksonville, where he posted a 3.86 ERA in two starts last season.

Here are White's scouting grades, per MILB.com, with an 80 being the highest possible grade.

Fastball: 60 (Above average/plus) | Slider: 65 (Above average/plus) | Changeup: 55 (average major league) | Control: 45 (below average/marginal)| Overall: 55.

Marlins prospect ranking: No. 2

Overall ranking: No. 41

Marlins fans will have to wait a little longer to see Arquette, with his MLB ETA not expected until 2028. There's an easy explanation for this: Arquette has only been in professional baseball since last summer, when the Marlins drafted him seventh overall. Arquette's professional numbers? A 242/.350/.323 slash line, plus a homer and 10 RBI, aren't popping out just yet, but he's only played in 27 games, all with High-A Beloit.

Here's what MILB had to say about Arquette.

"The 6-foot-5, 220-pound Arquette is bigger than most shortstops and hits the ball much harder than most players at his position. He combines a quick right-handed swing and strength with the propensity to drive balls in the air, giving him 30-homer potential. He has a reasonably disciplined approach but misses more fastballs than he should, including heaters over the plate."

The report went on to read that Arquette "moves well for his size and is an above-average runner, but not much of a threat to steal."

"Primarily a second baseman at Washington, he looked surprisingly smooth for a 6-foot-5 shortstop this spring," the report read. "He features plus arm strength and the ability to make throws from a variety of angles, and he may be able to remain at short in pro ball."

Here are Arquette's scouting grades.

Hit: 50 | Power: 60 | Run: 50 | Arm: 60 | Field: 50 | Overall: 55

Marlins prospect ranking: No. 3

Overall ranking: No. 51

As with White, it should only be a matter of time before Snelling makes it to the majors. He already has dominated in 11 AAA starts, posting a 1.27 ERA. Not only should Snelling be called up at some point in 2026, but one could argue that he's already done enough in AAA and thus deserves to be on the Marlins' opening-day roster. The most realistic outcome seems to be Snelling starting the year in Jacksonville and working his way to Miami before too long.

Here's how Snelling grades out.

Fastball: 55 | Slider: 55 | Changeup: 50 | Control: 50 | Overall: 55

Marlins prospect ranking: No. 4

Overall ranking: No. 70

The 23-year-old Mack is a top-10 catching prospect, and like White and Snelling, he's expected to make his MLB debut this year.

Last season, he put up a .250/.320/.459 slash line with 18 homers and 53 RBI over 99 games.

Here's how MILB.com scouts him.

"Mack's quick left-handed swing and strength produce plus raw power that plays to all fields. He works deep counts and doesn't chase too often, but his approach got too passive at times in the past. He struggles to deal with breaking balls and changeups, so he has compensated by looking to do damage whenever he gets a fastball in the zone, and he did a better job of pulling and lifting pitches last year."

MILB also cited Mack's background in basketball and volleyball.

"Mack is agile behind the plate and pounces on grounders in front of him," the report reads. "He has soft hands and has developed into a solid receiver and framer as he has gained experience and improved his focus. He has a plus arm and gets rid of throws quickly, which helped him erase 34 percent of base stealers last season."

Here's how Mack grades out.

Hit: 45 | Power: 50 | Run: 40 | Arm: 60 | Field: 55 | Overall: 55