Boston Red Sox Top 15 Prospects

The Boston Red Sox boast one of baseball’s best farm systems, both from a talent and depth perspective. Of course, it always helps when you have three top 40 prospects in Roman Anthony, Marcelo Mayer and Kristian Campbell, but it seems like each time you check in on a Red Sox prospect, whether it be an arm or a bat, they are progressing well. 

The system is a fun combination of the remnants of Chaim Bloom’s strong drafting and the impact of Craig Breslow and company’s pitching expertise and well-documented bat speed program. The most tangible shift has been the leap so many Red Sox prospect arms have made, whether it be an uptick in stuff or overhauled arsenal entirely.

Leaps from guys like Connelly Early, Brandon Clarke, Hunter Dobbins and Jedixson Perez make it hard not to buy into what the organization is doing on the pitching development front. Even after the Red Sox graduate their “Big Three”, the organization is poised to be a talent factory for some time. 

1. Connelly Early – LHP – (MLB)

Height/Weight: 6’3″, 200 | Bat/Throw: L/L | 5th Round (151), 2023 (BOS) | ETA: 2025

An athletic lefty, Early has saw his velocity tick up since being drafted while benefitting from some tweaks to his arsenal, ultimately leading to a 2025 breakout that saw him not only finding big league success, but pitching in the postseason for the Sox. He now looks the part of a middle-rotation arm.

Arsenal

Early utilizes a deep bag of offerings that work well off of each other from a low-three quarters release that can create a slight cross-fire feel for hitters. His plus extension allows his stuff to play up, which paired with the uptick in velocity he has seen has resulted in plenty of whiff.

His fastball has climbed from the low 90s at UVA to 92-94 MPH in his first pro season to 93-95 MPH in the early going of 2025. His below average release height and aforementioned release qualities result in above average zone whiff on the four seam along with a sinker that can really run in on the hands of lefties.

Early’s changeup has long been his best offering and has only played up more as he has gained velocity. It is a ground ball machine that picks up plenty of chase below the zone and off the plate away from righties.

The breaking balls took a huge leap forward for Early in 2025, gaining plenty of confidence in his low 80s curveball. The two-plane action particularly stifled right-handed hitters, but he will mix it in effectively to lefties.

Early developed a sweeper that he started to throw more in the big leagues as a left on left equalizer with plenty of success from a command and whiff perspective, overtaking his fringy gyro slider.

Outlook

Early was tabbed as a breakout candidate heading into 2025 and he did that plus more ripping through Double-A and Triple-A before validating his massive gains with MLB success. His release characteristics and the way that the arsenal works off of itself really shined through as his command and execution continued to come along, showcasing athleticism on the mound. Between the uptick in velocity and improved/added secondaries, Early easily looks the part of a middle-rotation starter, but his ability to continuously improve cannot be ignored.

2. Peyton Tolle – LHP – (MLB)

Height/Weight: 6’6″, 250 | Bat/Throw: L/L | 2nd Round (50), 2024 (BOS) | ETA: 2025

A big southpaw with a very unique delivery, Tolle started to dominate on the mound upon transferring from Wichita St.–where he was a two-way player–to TCU and focusing on solely pitching. Tolle’s deception and improved stuff has helped him make a smooth transition into pro ball, where he has dominated.

Arsenal

Tolle works down the mound impressively for a 6-foot-6 southpaw, getting 7.7 feet of extension, which would be tops in all of MLB. Pair that with a mid 90s fastball that gets decent carry, and you have an overwhelming heater that gets on hitters very quickly. As a result, Tolle has generated elite whiff rates on his fastball while holding opponents to a batting average around .180 against it.

The secondaries were a work in progress for Tolle as he entered pro ball and still have some room to improve. His gyro slider is ahead of his inconsistent changeup, filling up the zone with the pitch and tunneling well off of his fastball. Tolle’s changeup flashes average and could play up off of his fastball with better execution, but his iffy feel for it has it playing more like a fringy pitch at this point.

Tolle will also mix in a taste-breaking curve that is an effective pitch in the low 80s. He has started to bump the usage up as the season has progressed with the chance to overtake his changeup as his preferred offering against righties.

Outlook

The dominance of Tolle’s fastball and slider gave him a high-leverage relief floor, but now that his command and overall arsenal has come along further in his first pro season, the southpaw looks the part of a potential middle-rotation arm. He will need one of his changeup or curveball to separate as a reliable third pitch, though his 70 grade fastball hedges that prerequisite some.

Big and powerful at 6-foot-7, 250 pounds, Tolle is athletic for his size without much effort in his delivery, providing optimism that he can handle larger workloads too. All of a sudden, Tolle is one of the most exciting LHP prospects in the game.

3. Franklin Arias – SS – (Double-A)

3. Height/Weight: 5’11″, 170 | Bat/Throw: R/R | IFA: $525,000, 2023 (BOS) | ETA: 2027

Signed as a glove-first shortstop in 2023, Arias has developed impressively in the batter’s box, tapping into more impact while maintaining good contact and chase rates. Arias is a strong candidate to be the Red Sox next top overall prospect after Roman Anthony and Marcelo Mayer graduate given his relative polish and upside.

Hitting

Arias showcases impressive balance and lower half control in the box, gathering into his back side with a slow, hovering leg kick. There’s a chance sharper secondaries at more challenging levels could pull him onto his front side more often, but his strong ability to recognize spin and repeat his moves has helped at Low-A. If his ground ball rate remains elevated, an adjustment to keep his weight back longer should not be too difficult for him given the feel for his lower half that he already has.

He boasts a great feel for the barrel, spoiling tough pitches and posting plus contact rates within the zone. After being promoted to High-A, Arias maintained his ability to recognize spin, but became more swing-happy against fastballs, cutting into his walk rate, but he maintained his overall contact rate of nearly 90%.

Arias flashes average power to the pull side with respectable exit velocities for his age, though at this stage, his flatter swing path is more likely to result in line drives and doubles rather than high home run totals.

There’s still more room for Arias to add strength and as he develops he could make adjustments to elevate the ball more consistently, but for now, he skews slightly towards hit-over-power with strong on base skills and still enough impact to hit around 15 homers.

Defense/Speed

Though he is just an average runner, Arias gets the most out of his speed thanks to his solid first step and impressive instincts. Good hands and footwork help Arias attack the baseball on the dirt with confidence and is capable of getting the ball out quick. He puts himself in position to make more difficult plays look routine with the ability to make the difficult plays thanks to his above average arm. Arias is unlikely to be more than an opportunistic base stealer.

Outlook

Solid tools across the board with the instincts and baseball IQ to squeeze the most out of his ability, Arias has the upside to be an above average regular at shortstop, but is at least a high probability big league piece with his defensive value and elite bat to ball skills. With the huge leap Arias made from his age 18 to 19 season and seamless transition to Low-A, the Red Sox are understandably optimistic on his chances of becoming an everyday shortstop moving him somewhat aggressively. He made his Double-A debut still at 19 years old at the end of the 2025 season and should play the majority of the 2026 season in Portland as well

4. Juan Valera – RHP – (Doubl

5. Kyson Witherspoon – RHP – (CPX)

6. Justin Gonzalez –