Miami Marlins Prospects To Know

You are reading the free version of the Miami Marlins Top Prospects. In this version, you will get the full writeups on the top prospect in the system, the biggest sleeper, and a player I could see breaking out in 2025.

In this edition, you will see what I offer in the full team reports. For every farm system, you will get my top 50 ranked players and detailed reports on the top 30. Each report includes advanced player data, traditional scouting thoughts from live and video looks, plus thoughts from scouts around the league.

Let’s dive in on what you get in the full report!

Glossary:

FFG = Future Fantasy Grade - essentially, what is the likely long-term outcome for the prospect? This is always going to be more conservative. Handing out ace tags is not something I like to do. So, this is a realistic outcome.

90th Peak = If the player hits their best-case outcome, what does it look like?

Variance = How risky is this player’s profile, and how likely are they to hit their likely outcome? Low variance is good; high means more risky.

Format for report: Name/Position/Age on 2025 Opening Day/Height/Weight/Highest Level

Miami Marlins Top Prospects to Know

Top Overall Prospect

1. Thomas White, LHP, 20, 6’5”/210, A+

After a rocky start to the season, White settled in nicely. His promotion to High-A saw him improve statistically but also refine his arsenal and improve as a pitcher. He finished his first full season with a 2.81 ERA, a 29.2 percent strikeout rate, and a 9.2 percent walk rate across 96 innings. After two of his first three starts being rather rough, White finished his final 85.1 innings with a 2.43 ERA.

White dominates with a big fastball from a low-effort delivery, currently sitting around 95, but has gotten up to 97, on occasion, playing better at the top of the zone with its ride. The pitch averaged nearly 17 inches of IVB from a sub-six-foot release height and high spin rates.

White already has an advanced changeup, which plays quite well with his fastball, having late dive-and-fade. Hawkeye has the pitch with as much as 30 inches of vertical drop and consistently 15 inches of fade, making it firmly a plus pitch, sitting around 86 mph.

The slider is his go-to swing-and-miss pitch, sitting between 78 and 83 mph with a ton of vertical movement plus sweeping action. It is an interesting pitch, showing the depth of a curveball, but the sweeping action resembles more of a slider. If he can differentiate the two pitches and develop a true four-pitch mix, he becomes a deadly arm.

Already armed with one of the best arsenals of any left-handed pitching prospect in the game, White is an above-average strike thrower, posting a mark near 64 percent this year and had a near 16 percent swinging strike rate.

FFG: SP2-3 Caliber Arm

90th Percentile Peak Outcome: 180 IP/3.30 ERA/220 K

Variance: Medium

Buy/Sell: Buy

Marlins Sleeper Prospect

14. Keyner Benitez, LHP, 18, 6’1”/165, A

Benitez began the season as a 17-year-old who was pitching at the complex. He jumped to Single-A just days after his 18th birthday and pitched extremely well. Pitching 69.2 innings, Benitez posted a 2.71 ERA with 77 strikeouts to 28 walks. Listed at 6’1”/165 lb, Benitez seems to have added some weight, having a strong lower half.

The lefty gets a ton of east-west movement on his pitches and has shown five pitches. The sinker and four-seam sit around 93 mph but have been as high as 95 mph. Both pitches get a similar amount of IVB, nearly 15 inches from a 5’8” release height. Benitez gets a big extension, nearly seven feet, which allows his entire arsenal to play up.

The changeup was Benitez’s most used secondary, sitting between 82 and 83 mph with heavy fading action. He sells it well, and it tunnels with the sinker before causing it to tumble and fade late. Single-A hitters posted a 53 percent whiff rate against that pitch.

The slider sits in the upper-70s with good sweeping action and depth, and Benitez occasionally mixes in a curveball that sits in the mid-70s with a nice two-plane break.

Right now, the questions surround strike-throwing ability. The strike rate sat slightly north of 60 percent this year, which is below average, but again, this is a young 18-year-old. He misses bats and has a deep arsenal. Benitez should be a major helium prospect in 2025.

FFG: Upside SP5

90th Percentile Peak Outcome: 150 IP/4.00 ERA/155 K

Variance: Very High

Buy/Sell: Buy

Miami Marlins Breakout Prospect for 2025

10. Luis Cova, OF, 18, 6’1”/180, DSL

Signing for $1.4 million in January of 2024, Cova brings good bat speed and contact to a very athletic frame. He looks bigger than his presently listed 6’1” frame and has plus or better speed. The contact skills are impressive and Cova has shown a good feel for recognizing spin.

The surface-level stats don’t inspire much confidence, as Cova slashed just .239/.376/.348 with three home runs. However, the positive takeaways were just a ten percent strikeout rate and 36 stolen bases.

Having grown into more power over the last year, Cova projects to be a solid power and speed play. Given the range and glove in centerfield, Cova could blossom in 2025. Use the pedestrian surface level numbers to buy low on Cova this offseason.

FFG: Power/Speed Threat

90th Percentile Peak Outcome: .255/345/18 HR/20 SB

Variance: Very High

Buy/Sell: Buy