Boston Red Sox 2026 Top Prospects Rankings: Marcus Phillips (No. 9)

[Nick John]

Talk Sox's top prospect rankings continue into the latter half, focusing on the Boston Red Sox's top 10 prospects. Be sure to check out our previous rankings here:

Part 1 (Nos. 16-20)
Part 2 (Nos. 11-15)
Part 3 (No. 10): Anthony Eyanson

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Boston Red Sox Top Prospects: No. 9 Marcus Phillips

The Red Sox had a plan in mind when they entered the 2025 draft, and that was showcased by taking three talented pitchers within their first four picks. Phillips, who was selected by the team with their Competitive Balance pick that was acquired in the Quinn Priester deal, follows the blueprint of pitchers that Craig Breslow is after. Thanks to his size, power and athleticism, along with an aptitude that allowed him to improve significantly in college, Phillips has a chance to be something special with help from the Red Sox pitching lab.

Standing 6-foot-4 and weighing 245 pounds, Marcus Phillips also has great extension, which currently reaches 6.43 feet. His delivery also ends in a very low release height that, when paired with his stuff and extension, should lead to positive results on the mound. The right-hander pitched his sophomore and junior seasons for Tennessee; in the latter year, he made 17 starts as the team’s Saturday starter. He finished the season going 4-5 with a 3.90 ERA in 83 innings along with 98 strikeouts and 34 walks.

Phillips works with three pitches: a fastball, slider and changeup. All three are rated positively by scouts, with most suggesting each should at least by average by the time he reaches the majors. The fastball averaged 96-99 mph in college and would occasionally reach 101 mph. Unfortunately, it plays below its velocity at times and his control is still a work in progress.

The slider averaged between 84-88 mph in college, having more horizontal shape with a high spin rate. It's perhaps his most consistent pitch in terms of missing bats. His changeup is his weakest pitch but will be necessary to develop if he hopes to remain in the rotation. The pitch was thrown in the low-90s in college and can generate the most whiffs, but also is the one he struggles to control the most.

Beyond that control, another area he may look to work on is adding a fourth pitch to his repertoire such as a cutter (a pitch the Red Sox have worked with many young pitchers on). Phillips could very well be a boom-or-bust prospect based on how his feel develops over the next few years. His delivery and inability to consistently throw strikes has made scouts wonder if the bullpen is where he is best suited, thanks to a fastball that could end up averaging 100 mph in shorter stints. Should Phillips reach his potential and improve upon his strike-throwing ability, he could end up as a middle-of-the-rotation arm.

Where Phillips opens the 2026 season is up in the air. While it’s likely he could begin the season with High-A Greenville, there’s also the possibility that the organization chooses to send him to Low-A Salem to work on a few things before getting a May promotion to the next level. Though, with his stuff, there’s a chance he finishes the season at Double-A regardless of where he opens the year.

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