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Chris Clegg's top 10 Boston Red Sox prospects for 2025. The top Red Sox fantasy baseball prospects for dynasty leagues with detailed scouting reports.
The Boston Red Sox farm system overhaul over the last few years has been impressive to watch. Showing the elite ability to find studs in the draft via scouting, but also knowing how to develop each player has paid off in a big way. Even after the Garrett Crochet trade, the Red Sox still have one of the better farm systems in the game.
Today, we will cover the Boston Red Sox top prospects heading into the 2025 season as part of the MLB Prospect Rankings for Each Team series. There is a ton of talent to know here for dynasty leagues. RotoBaller readers can see reports on the top ten Red Sox fantasy baseball prospects below and can see the full 30 by heading to the Dynasty Dugout!
So who is on the way to Boston, and what to do those players bring to the table for fantasy baseball dynasty leagues? Let's dive in to the Boston Red Sox top 10 prospects for 2025.
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#1 Red Sox Prospect - Roman Anthony, OF
Age 20, 6’2”/200, AAA
Anthony followed an impressive 2023 season up with an even better one in 2024, pushing himself to the top of prospect rankings. In 119 games between Double-A and Triple-A, Anthony slashed .291/.396/.498 with 18 home runs and 54 extra-base hits. The combination of contact, plate discipline, power, speed, and defense make him a true five-category asset.
Starting with his contact and approach at the plate, Anthony starts with his hands and a slightly open stance. He uses a leg kick to create quite a wide stance, but helps create good hand-to-hip separation. Leading with his body, Anthony creates good lag with the bat thanks to his strong hands and electric bat speed. His bat speed ranks at the very top of all hitters in baseball.
Given the bat speed, the power metrics are off the charts, though, as Anthony has a 90th percentile exit velocity near 109 mph. Topping out north of 116 mph and showing solid average exit velocities, Anthony easily shows plus or better power. The biggest flaw with the power is a ground ball rate just shy of 48 percent which is something to watch.
The plate discipline skills are impressive, and Anthony knows the strike zone as well as anyone. He chased just 21 percent of pitches out of the zone. The contact skills follow along right with the discipline, as Anthony posted a 75 percent overall contact rate with an 83 percent in-zone mark.
Anthony is an above-average runner at present and stole 21 bases on 28 attempts last season. He is likely to slow down with age and as he continues to fill out his frame. Anthony is a plus glove as well with an above-average arm. He likely fits into right field in Fenway Park which plays to his strenghts.
If you want to poke a hole in Anthony’s game, it is the amount of ground balls he hits. But considering how hard Anthony hits the ball, he is actually able to run higher BABIPs. With a slight tweak in the swing path, Anthony could unlock 30 home runs in the majors. The skills are there, and Anthony is going to be an awesome player for a long time.
#2 Red Sox Prospect - Kristian Campbell, MI/OF
Age 22, 6’3”/191, AAA
Campbell had an extraordinary year, and there is a clear reason why he was named Minor League Player of the Year by multiple big outlets. Ascending from High-A to Triple-A by season end, Campbell slashed .330/.439/.558 in 517 plate appearances. Campbell blasted 20 home runs and had 32 doubles and three triples to have an impressive 55 extra-base hits.
Early in the year, it seemed Campbell was trading his strong contact skills for power. In the first two months of the season, Campbell had a contact rate below 73 percent, which was a massive outlier from what he had been throughout his playing career. Month by month, Campbell found a way to blend his strong contact skills with impressive power gains.
From June forward, his overall contact rate was north of 82 percent, with an in-zone mark near 90 percent. He finished the season with a 78 percent overall mark and an 83 percent in-zone contact rate. The plate discipline was evident as well by a 21 percent chase rate.
The power gains were also real this year, as Campbell posted a 90th-percentile exit velocity of around 106 mph. He hit home runs as far as 450 feet with exit velocities north of 113 mph. He learned to elevate the ball more this year, thanks to an offseason swing change and the home runs showed up as Campbell hit 20 in 2024.
Built like an NFL wide receiver, Campbell is an incredible athlete and leader on and off the field. He is the clubhouse presence that teams want, and given his performance in 2024, he checks nearly every box. His versatility on the field should allow him to find a spot in the Red Sox lineup as soon as opening day 2025, where he should impact the game with power and speed.
#3 Red Sox Prospect - Marcelo Mayer, SS
Age 22, 6’3”/188, AAA
After a shoulder injury derailed Mayer’s 2023 season, a hip injury and a lumbar strain limited him to just 77 games in 2024 and kept him from playing after his promotion to Triple-A. Selected fourth overall in the 2021 draft, many saw Mayer as the top prospect in that year’s draft, but he fell in the Red Sox lap at fourth overall. We have not seen Mayer actualize his potential, strictly due to not being on the field consistently. Over the last three years, Mayer has averaged just 82 games played per year.
Mayer has a strong frame for a shortstop with smooth actions in the field. At the plate, he shows a simple setup and a direct path to the ball with a solid feel for the barrel. His quick hands help generate plenty of bat speed, which took a step forward in 2024. The swing plane can be steep sometimes, leading to a high ground ball rate, which sat at 48 percent in 2024.
For a third straight season, his power progressed. Mayer’s 90th percentile exit velocity jumped to 106.5 mph, and he maxed out at 115. Despite the exit velocity jump, Mayer hit just eight home runs in 335 plate appearances due to his batted ball distribution. The ground ball rate spiked, and Mayer also saw his line drive rate take a healthy jump to 26 percent, but the fly ball rate fell to just 27 percent.
The contact skills are interesting, though. Mayer has always been billed as a plus hitter, but the contact rates have not reflected that. Mayer made contact on 72.5 percent of swings in 2024, with an in-zone mark around 80 percent. He handled fastballs exceptionally well, posting a contact rate in the upper 80 percent range on those pitch types. But if Mayer gets a breaking ball down in the zone, there will be issues. He posted a whiff rate on breaking balls near 50 percent in 2024, which is a significant concern.
While he is a below-average runner, Mayer makes plays that you might not think he would. His instincts are good, and he has a strong arm. He may slide over to third base, but that is far from a guarantee.
The injury history is concerning, but if Mayer can put those behind him in 2025, he should be set up for a nice season and an MLB debut.
#4 Red Sox Prospect - Franklin Arias, SS
Age 19, 5’11”/170, A
Arias showed all the traits you wanted to see from a potential breakout during Spring Training, which is precisely what happened during the 2024 regular season. After dominating the complex, Arias held his own in Single-A and, between both levels, posted a combined .309/.409/.487 slash in 372 trips to the plate. He hit nine home runs and had 36 extra-base hits.
Considering his age, the exit velocity data is strong, with Arias's average exit velocity around 90 mph and a 90th percentile near 102 mph. The hard-hit rate north of 40 percent was also impressive.
The contact skills were impressive as Arias made contact on 78 percent of swings with an in-zone rate north of 82 percent. He does not expand the zone often either, having a chase rate near 25 percent on the year.
While he did steal 35 bases in 2024, Arias is presently a below-average runner. He gets good reads on the base paths and makes good plays in the field due to his instincts. But long term, I would not expect Arias to be a great source of stolen bases.
Considering that he just turned 19 and the depth the Red Sox have in the infield, Arias will likely start 2025 back in Single-A, but he has the chance to spend half of the season in Greenville.
#5 Red Sox Prospect - Luis Perales, RHP
Age 21, 6’1”/160, AA
Perales has always been known as a solid pitching prospect, but he took a major step forward in 2024 before an arm injury ended his year with Tommy John. In 33.2 innings between High-A and Double-A, Perales posted a 2.94 ERA with 56 strikeouts to 12 walks.
The fastball averaged near 97 mph this year and touched 100 mph while showing elite IVB of 20 inches. Perales cuts the pitch, but it plays exceptionally well with the velocity and release point at which Perales throws it. You could argue a 70-grade fastball here.
Perales’s 88-91 mph cutter sets him up nicely to get weak contact. It gets a shorter horizontal break and was a pitch that made significant strides in 2024 before his injury.
The splitter is nasty and one that Perales snaps off exceptionally well. Sitting in the 85-88 mph range, the pitch misses many bats thanks to its late fade and dropping action. While it was primarily used against lefties, Perales also showed the ability to drop it in on righties.
Perales rounds out his arsenal with an 84 mph slider that plays more like a curveball. Given his release point, it is tough to spin a slider, and this pitch plays with an 11-5 shape. It is a solid bat-missing pitch that he is comfortable throwing at the top or bottom of the zone.
The arsenal is impressive, grades out exceptionally well on stuff plus models, and the strike-throwing has improved significantly this year. While home runs ate Perales alive in Greenville last year, mainly due to fastball location, it improved a ton in 2024. Perales’ ability to live in the zone more while still missing bats led to significant progress. If it were not for Perales going down with Tommy John Surgery, he was trending toward being a top pitching prospect in baseball.
What Perales looks like upon his return from Tommy John is still a significant question. He should return at some point late in the 2025 season.
#6 Red Sox Prospect - Yoeilin Cespedes, SS
Age 19, 5’8”/181, A
Cespedes was the big-name signing for the Red Sox in the 2023 international signing period, landing a $1.4 million bonus. Despite having a shorter frame, Cespedes hits the ball hard and generates effortless power, thanks to his high-end bat speed. While he may be shorter, listed at 5’8”, Cespedes is strong and built like a bowling ball. It is not often you see players with as strong of wrists and forearms as he has at this age.
After dominating against complex-level pitching, Cespedes was promoted to Single-A Salem. Unfortunately, he did not debut due to a hamate injury that required surgery. In his 105 complex-level plate appearances, Cespedes slashed a robust .319/.400/.615 with five home runs, ten doubles, and a triple.
Cespedes made contact on nearly 80 percent of his swings and produced some significant exit velocities, maxing out north of 110 mph, a three mph jump from his age 17 season. While Cespedes is an aggressive hitter, he did show improvements in his chase rate and walk rate from 2023 to 2024.
While taking some big swings, Cespedes does damage. He rarely puts the ball on the ground, having an air percentage of 64 percent, and he pulled the ball 53 percent of the time in 2024. He does a great job of making quality contact in all parts of the zone, even on pitches out of the zone. However, Cespedes will likely be challenged more against better pitching as he moves up and must be more selective.
Cespedes is a bat-first prospect who will likely move off shortstop sooner rather than later. He could play third base, but second is still on the table. Regardless of where he moves, the bat is going to play.
#7 Red Sox Prospect - Miguel Bleis, OF
Age 21, 6’0”/170, A+
After starting the year strong in Single-A, Bleis struggled in his half-season in High-A Greenville. His High-A slash line of .191/.265/.319 is rough, leading to a season-long line of .221/.303/.354. Bleis hit 11 home runs and stole 38 bases on the year, but the surface numbers do not paint a great picture of his year. The BABIP is quite telling, as Bleis ran a .219 mark in High-A after sitting north of .300 for most of his career.
Bleis has run contact rates that are slightly above average and has consistently hit the ball hard, registering a batted ball of 113 mph this year. He pulls the ball consistently and gets plenty of lift. He did run very high infield fly ball rates, which was a significant reason Bleis ran a lower BABIP.
He finished the year with a contact rate near 73 percent and an in-zone mark near 82 percent. He is aggressive, running a chase rate north of 30 percent. The quality of the athlete with the tools he brings to the table is that of a top prospect in this system.
Given the combination of his glove and range in the outfield, paired with the power and speed elements of his game, Bleis still has plenty of tools to dream of. Still, they will need to be actualized into game production soon. It is too soon to write off Bleis, but 2025 will be a telling season in his development.
#8 Red Sox Prospect - David Sandlin, RHP
Age 24, 6’4”/215, AA
If you look at the surface ERA, you might not see the second-best pitching prospect in the Red Sox system. The good news is that Sandlin is so much more than the 5.34 ERA he posted this year in 57.1 innings between High-A and Double-A. Injuries have been a concern as he missed time this year with a forearm injury and an oblique injury in 2023, but the pure stuff is incredible.
The arsenal and pitch sequencing improved all season, and Sandlin made notable improvements with slight grip tweaks to his pitches. He showed a true five-pitch mix with five separate velocity bands.
The fastball sits between 96-97 mph, but has topped out at 100. The pitch gets above-average IVB, and when he locates it up, he misses plenty of bats. The command of the pitch does need to improve as Sandlin did show to be home run prone at times, especially when he left the fastball over the middle.
Sandlin shows two variations of his slider, with a sweeper in the mid-80s and a gyro-shape near 90 mph. He also mixed a harder, shorter cutter at 89-90 mph. The gyro plays like a cutter at times, with some pitches having more carry and short horizontal movement. The sweeper regularly gets 15 inches of horizontal movement.
The splitter reaches 94 and sits between 90-92 depending on the outing. A 94 mph splitter that resembled a splitter/splinker of one of the best pitchers in all of baseball, Paul Skenes. Sandlin rounded out the arsenal with an 80 mph curve, which is used more as a pitch to change hitter’s eye levels and get them off the fastball.
Durability is still a major issue. The most innings he has thrown in a season is 97, which he did in 2022 while still at Oklahoma. Sandlin has a starter's frame with a big upper half and broad shoulders. His arsenal has the potential to be one of a high-end starting pitcher. He is very good; we just need to see consistency and the ability to throw innings in 2025.
#9 Red Sox Prospect - Jhostynxon Garcia, OF
Age 22, 6’0”/163, AA
The stretch of performance that Garcia has put up in High-A Greenville is absurd and one of the best performances I have seen in a long time. That includes a lot of really talented Red Sox prospects to come through the system. Jumping from Single-A up to Double-A by season’s end, Garcia hit 23 home runs, 16 of which came in 53 games in Greenville. He slashed a strong .286/.356/.536 with 52 extra-base hits and 17 stolen bases.
Garcia has effortless power and controls the barrel well. He lifts the ball with ease and rarely puts the ball on the ground, having an air percentage north of 65 percent. The contact rates are average, and he handles fastballs exceptionally well. Garcia does have an aggressive approach, chasing at a 33 percent clip in 2024, mostly against breaking balls.
The exit velocity data was strong and backed the home run breakout. His 90th percentile exit velocity sat around 106 mph, an impressive mark. Given the ability to lift his hardest-hit balls, Garcia runs high barrel rates.
Garcia is well filled out and much bigger than his listed 163 pounds. He runs well for his size but is likely an average runner long-term who is not a threat to steal bases. The Red Sox showed confidence in him by adding him to the 40-man roster. While he is unlikely to debut in 2025, Garcia will likely spend a decent portion of the year in Triple-A.
#10 Red Sox Prospect - Richard Fitts, RHP
Age 25, 6’3”/230, MLB
Fitts made his MLB debut in 2024 and looked relatively strong across 20.2 innings, even though he did not miss many bats. This came after 116.2 Triple-A innings in which Fitts posted a solid 4.17 ERA with a 22.6 percent strikeout rate to a 7.5 percent walk rate.
A hulking presence on the mound, taller than his listed 6’3”, Fitts leads with a fastball that sits near 94 mph. Throwing from a higher 6’2” release height, Fitts creates average ride and short horizontal movement.
From a secondary standpoint, Fitts throws two variations of his slider: an 87 mph gyro-slider and an 83 mph sweeper. His splitter sits in a similar velocity range to the gyro-slider, having eight to ten inches of fading action and some carry to it. It is one of his go-to weapons against left-handed batters.
Fitts is an above-average strike thrower, landing 67 percent of pitches for strikes in 2024. There is not any true bat-missing pitch in the profile, but Fitts does a good job landing pitches for called strikes. With his frame and ability to throw both innings and strikes, he profiles as a high-floor, backend starting pitcher.
For full reports on the Top 30 Prospects in the Boston Red Sox system and the Top 50 ranked, head to the Dynasty Dugout for more of Chris's work!
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