Red Sox Non-Roster Invitees: Breaking Down Every Player Invited To Spring Training

[Nick John]

Spring training is officially here as pitchers and catchers have reported to Fort Myers. Along with those on the 40-man roster, the Red Sox have invited quite a few players to their spring training camp as non-roster invites. Every season, teams manage to find key contributors through this process, as many veterans try to catch on with a team by signing a minor-league deal with an invitation to spring training. Along with veterans, teams tend to bring prospects into big league camp in similar fashion.

Last season the Red Sox saw contributions from a handful of non-roster invitees in the form of Nate Eaton, Abraham Toro, and Sean Newcomb. This season, the team has currently invited 24 players to spring training, though that number could increase in the days leading up to the first days of practice.

Here is an overview of the players invited to camp:

Red Sox Non-Roster Invitees: Pitchers

RHP Osvaldo Berrios

Berrios signed with the Red Sox on a minor-league deal back on November 18 while the team was making several trades prior to the Rule 5 protection deadline. Berrios, who was drafted in 2017 by the Athletics had previously been acquired by the St. Louis Cardinals in June of 2024 after playing in the Independent Frontier League.

Berrios split the 2025 season between Double-A Springfield and Triple-A Memphis where he appeared in a total of 40 games, going 4-4 with a 5.12 ERA in 58 innings. He struck out 62 batters and walked 24. In seven minor league seasons, Berrios has appeared in 155 games with 56 of them being starts. Overall, he’s gone 23-34 with 16 saves and a career 5.44 ERA in 420 1/3 innings pitched.

In 2025, the 26-year-old struck out 9.62 batters per nine innings and throws four pitches: a fastball that tops out at 94 mph, a 78 mph curveball, a low to mid-80s changeup and a mid-80s slider.

LHP Alec Gamboa

Gamboa is a former ninth-round pick by the Los Angeles Dodgers who played in their organization until getting released in early 2025. The left-handed pitcher mainly appeared out of the bullpen during his time with the Dodgers, making his way up to Triple-A by 2023 and spending parts of three seasons there before finishing 2025 in the Korean Baseball Organization with the Lotte Giants.

During his time in Korea, Gamboa moved to the rotation where he pitched rather well in 19 starts. Going 7-8, he tossed 108 innings with a 3.58 ERA and struck out 117 batters. With the Dodgers’ organization, Gamboa appeared in 131 games and made 41 starts going 28-22 with a 4.23 ERA in 359 2/3 innings with 315 strikeouts.

Gamboa’s biggest weakness is subpar control which limits his swing-and-miss potential, though he's good at keeping the ball on the ground.

RHP Tayron Guerrero

Guerrero is one of the older players coming into camp with the Red Sox as a non-roster invitee at the age of 35 years old. The reliever has had some experience in the majors though not with the best results. He made his debut in 2016, pitching one game with the San Diego Padres before being traded to the Miami Marlins near the trade deadline.

Guerrero would see himself appear in 112 games between 2018 and 2019 with Miami to less-than-stellar results. During his time with the Marlins, the right-hander tossed 104 innings and struck out 111 batters while walking 67. He finished his time in Miami with a 5.80 ERA before being selected off waivers by the Chicago White Sox following the 2019 season.

He would not play in the 2020 COVID shortened season and would then spend 2021 at the White Sox’s Triple-A team before heading overseas to play for the Chiba Lotte Marines in 2022. Guerrero would return state side in 2023 where he pitched for the Cincinnati Reds’ Triple-A team before finishing the season pitching in the Mexican League. 2024 was more of the same this time with the Los Angeles Angels’ Triple-A team before returning to Japan for the 2025 season where he rejoined the Chiba Lotte Marines.

Overall, he pitched in 39 games with the Marines' main team and their farm team tossing 39 2/3 innings and striking out 37 batters.

RHP Hobie Harris

Harris spent the 2025 season in the Red Sox organization after being selected in the Triple-A portion of the Rule 5 Draft. The 32-year-old made 31 appearances with Triple-A Worcester, and one rehab start in the Florida Complex League despite not being active from the injured list until mid-June. In those 32 appearances, he went 1-3 with a 4.05 ERA across 40 innings where he struck out 45 batters.

The right-hander was drafted back in the 31st round of the 2015 draft by the New York Yankees and pitched in their organization through the 2019 season. Starting in 2021, Harris bounced around pitching for the Triple-A teams of Toronto, Milwaukee, Washington and Minnesota before signing with the New York Mets. He never pitched a game for them as the Red Sox took him in the Rule 5 Draft as previously mentioned.

Harris has made 16 appearances in the majors, all with the Nationals back in 2023. In those appearances, he tossed 19 1/3 innings and struck out nine.

RHP Kyle Keller

Keller was one of Boston’s later invites, signing with the team on February 3. The 32-year-old was drafted in the 18th round of the 2015 draft by the Miami Marlins and would make his debut with them in 2019. He would be traded after the season to the Los Angeles Angels though he would only pitch in two games before being purchased by the Pittsburgh Pirates in 2021.

For his career, Keller has pitched in 44 games and tossed 46 1/3 innings with a career 5.83 ERA. He also struck out 48 batters while walking 32.

Since the end of the 2021 season, Keller has pitched in the Nippon Professional Baseball league for the Hanshin Tigers and Yomiuri Giants, where he revitalized his career and generated interest by the Red Sox. In those four seasons, Keller was a key bullpen arm as he appeared in 186 games between the farm teams and parent organizations. In that span, he threw 179 1/3 innings with a 2.21 ERA while striking out 206 batters in the pitcher-friendly league.

RHP Seth Martinez

Martinez may be the pitcher with the best major league track record on the list, as he was once a key arm in Houston’s bullpen. Drafted by the Astros in the Rule 5 Draft back in 2020, Martinez appeared in just three games in 2021 before pitching in 108 games over the next three seasons. For his career with the Astros, he threw 137 1/3 innings with a 3.93 ERA and 122 strikeouts to 54 walks.

Following the 2024 season, Martinez bounced around on waivers, being claimed by the Diamondbacks, then the Marlins, Mariners and Marlins once more before the start of the 2025 season. The right-hander spent most of 2025 with Triple-A Jacksonville where he appeared in 41 games and tossed 43 2/3 innings with a 3.71 ERA. He would also make six appearances with the Marlins where he struck out four in 6 2/3 innings.

RHP Vinny Nittoli

A 35-year-old pitcher who has made a total of 15 appearances across four seasons, Nittoli hasn’t pitched in the majors since 2024 and split the 2025 season between the Triple-A teams of Baltimore and Milwaukee. The Red Sox are now the 12th organization he’s been a part of in his career.

In 37 games, Nittoli tossed 39 1/3 innings with a 4.58 ERA. He also struck out 46 batters while walking just 15. In his major league career, he’s tossed 18 2/3 innings with a 2.41 ERA and 13 strikeouts.

Nittoli is an addition that continues Craig Breslow’s interest in big extension, as the right-hander’s extension last season was 7-foot-2 and also saw an increase after joining Milwaukee’s organization. The main difference being more usage for his cutter which went from a 35% usage rate all the way up to 53% upon joining Milwaukee. Across the entire 2025 season, the cutter generated a .172 expected batting average and had a 31% whiff rate.

RHP Wyatt Olds

Olds was drafted by the Red Sox in the seventh round of the 2021 draft and has split the past two seasons between Portland and Worcester, though he spent the majority of 2025 at Triple-A. The 25-year-old dominated in eight appearances early on with Portland, going 4-2 with a 2.50 ERA across 18 innings out of the bullpen.

His promotion to Worcester saw some growing pains, as he appeared in 34 games and had an ERA of 5.91 across 53 1/3 innings. Currently, Olds is viewed as organizational depth due to his need to work on his command and control, though his fastball and slider look promising.

Olds throws three pitches, the previously mentioned fastball (that tops out at 98 mph), the slider and a changeup that can touch 90 mph.

LHP T.J. Sikkema 

Sikkema, who was a former New York Yankees draft pick, was traded by the team to the Kansas City Royals for Andrew Benintendi back in 2022 before being taken by the Cincinnati Reds in the Rule 5 Draft in 2023.

A left-hander, Sikkema made it to Triple-A for the first time last season after 18 appearances at Double-A Chattanooga. Overall the left-hander went 8-4 in 23 appearances, 15 starts as he tossed a career high 86 2/3 innings. For his career, he’s made 100 appearances in the minors and thrown 311 innings with a 4.57 ERA.

He doesn’t throw hard, his fastball averaging 88 to 91 mph but can hit mid-90s but not consistently. Along with that, he also throws a slider that is in the low to mid-80s and an average changeup.

RHP Noah Song

Song has been someone the Red Sox have liked for a long time, but various events have kept him from being able to reach his full potential. Drafted in the fourth round of the 2019 draft, Song showcased a strong start to his professional career by tossing 17 innings with a 1.06 ERA in 2019 before losing the 2020 season due to it being cancelled from COVID. That was followed by missing both the 2021 and 2022 seasons due to his petition to delay his active service with the Navy being denied.

Following the 2022 season, Song was drafted in the Rule 5 Draft by the Philadelphia Phillies and the man who drafted him originally, Dave Dombrowski. He was granted his request to delay his active service time in February 2023 and finally reported to spring training with the Phillies. Back tightness sent him to the injured list in spring training before he made his first appearance in four years on June 28 with Single-A Clearwater.

Song was eventually returned to the Red Sox after being designated for assignment and clearing waivers where he would finish the season with Greenville. He would go on to miss the 2024 season due to Tommy John surgery.

2025 saw him pitch in all five minor league levels (Complex League, Single-A, High-A, Double-A, Triple-A) with his longest stay being 23 appearances with Portland where he tossed 43 innings with a 4.19 ERA and struck out 44 batters.

RHP Devin Sweet

Sweet has been in professional baseball since 2018 as part of the Seattle Mariners’ organization. The right-hander pitched his way up to majors with Seattle in 2023, making two appearances with them before the Athletics selected him off waivers and he made five more appearances with them. Overall, he pitched in seven games with a 10.38 ERA and struck out six batters in 8 2/3 innings.

Since then, Sweet spent the 2024 season with Detroit’s Triple-A team and the 2025 season with Philadelphia’s Triple-A team. Last year, he pitched in 46 games and tossed 51 1/3 innings with a 5.08 ERA. He also struck out 49 batters and walked 27.

Sweet throws three pitches: a four-seam fastball, a slider and a changeup.

RHP Jacob Webb

Webb was drafted by the Red Sox in the 14th round of the 2021 draft. Last season, Webb split the year between Greenville, Portland and Worcester, making a total of 25 appearances. He would end up tossing 40 1/3 innings with a 3.57 ERA (though it was 6.35 in 11 1/3 innings with Worcester) and struck out 46 batters.

This is the second consecutive spring training that Webb received an invitation to spring training from the Red Sox, having been invited in 2025 as well. He has a low release point and a high induced vertical break on his fastball.

Webb tosses four pitches: a fastball that tops out at 96 mph, a slider that can vary in shape and velocity, a sweeper and a changeup that can touch 90 mph.

LHP Jeremy Wu-Yelland

Wu-Yelland was drafted back in the fourth round of the 2020 draft by Boston and has had a tough time staying on the field after his debut season in 2021. After making 23 starts between Salem and Greenville, Wu-Yelland would miss 2022 due to needing Tommy John surgery. Upon his return in 2023, he would only make three appearances in the Florida Complex League before another injury would shut him down for the rest of the season.

2024 saw a move to the bullpen for the left-hander but he still opened the season on the injured list due to stiffness. He would make 23 appearances out of the bullpen with a 5.67 ERA in 33 1/3 innings for Greenville.

2025 saw Wu-Yelland miss just under a month with lower back stiffness, but he still made 25 appearances between Greenville and Portland where he threw 45 2/3 innings with a 3.15 ERA and struck out 71 batters.

Wu-Yelland throws four pitches: a fastball that tops out at 97 mph, a cutter which is his most thrown pitch, a sweeper that has a very high spin rate and a changeup that sits in the low-80s.

Red Sox Non-Roster Invitees: Catchers

Nate Baez

Acquired from the Minnesota Twins for Tristan Gray, Baez split the 2025 season between High-A and Double-A where it was two different stories offensively for the catcher. Overall, he would play in 96 games and hit a combined .278/.371/.423 with 17 doubles, four triples, eight home runs, and 54 RBIs. Though, in Double-A his numbers were .237/.297/.400 with eight doubles, four triples, five home runs, and 31 RBIs.

Despite that, Baez showed an ability to put the ball in play last season, striking out just 65 times in 338 at-bats and walking 45 times as well.

Defensively, he split time between catcher, first base and designated hitter. While with Double-A, he threw out 23% of potential base stealers while allowing just two passed balls.

Jason Delay

Signed by Boston to be catching depth, Delay is a former fourth-round pick in 2017 by the Pittsburgh Pirates. Delay would go on to make his major league debut in 2022 and would play in the majors with the Pirates from 2022 until a short stint in 2024.

In total he played 134 games, hitting .231/.295/.315 with 20 doubles, one triple, two home runs, and 35 RBIs. Offensively, there isn’t much power to his game, and he has a tendency to strike out (94 strikeouts in 337 at-bats) while not walking enough to offset it (26 career walks).

2025 saw Delay split the season between Atlanta’s Double-A and Triple-A teams where he hit a combined .200/.261/.257 in 68 games. He also had 10 doubles, one home run, and 14 RBIs.

Ronald Rosario

Rosario was signed as an international free agent by the Red Sox in July of 2019 as a 16-year-old, though he missed the 2020 season due to the minor league season being cancelled. The young catcher spent 2021 and 2022 in the Dominican Summer League and Florida Complex League respectively before playing for Salem and Greenville in 2023. 2024 saw Rosario begin the year with Greenville, playing 99 games before a promotion to Portland where he was placed on the development list.

2025 saw Rosario play 98 games with Portland where he hit .201/.278/.321 with 10 doubles, 11 home runs, and 56 RBIs. Offensively, he is viewed as having an average hit tool with average power but mostly as a doubles hitter.

Defensively, he could be an average catcher depending on how he develops. He doesn’t have soft hands and in 2025 he made six errors and allowed 10 passed balls. Though, he has good, fluid motions and threw out 24% of potential base stealers and was part of seven double plays.

Max Stassi

Stassi has the most MLB experience out of the listed catchers, having been drafted way back in the fourth round of the 2009 draft by the Athletics. Stassi made it to the majors with the Astros in 2013 and played with them until being traded to the Angels in 2019. Stassi would remain with the Angels until the end of 2022.

After not playing in 2023, Stassi has spent the last two seasons in Triple-A with the White Sox organization in 2024 and the Giants organization in 2025.

For his career, Stassi played in 403 games at the major league level and hit .212/.295/.361 with 42 doubles, two triples, 41 home runs and 128 RBIs.

For his career, he’s thrown out around 20% of potential base stealers and has allowed 31 passed balls.

Red Sox Non-Roster Invitees: Infielders

Nathan Hickey

Originally drafted as a catcher in the 2021 draft, Hickey has primarily played first base or DH since mid-2024 and only appeared in four games as a catcher in 2025 after getting a non-roster invitation to spring training that year.

Defensively, he struggled at catcher and was viewed as being below average when it came to receiving while also having trouble with blocking pitches in the dirt. He has looked better at first base than he did behind the plate, having made just four errors in 610 defensive chances.

Offensively, Hickey is coming off of a decent season with Worcester, having appeared in 128 games where he hit .234/.325/.408 with 23 doubles, two triples, 17 home runs and 75 RBIs. He does strike out a lot as shown by his 141 punchouts last season. He also knows the strike zone well but often whiffs on pitches in the zone and struggles against left-handed pitching.

Vinny Capra

Capra is a four-year veteran who made his debut in 2022 after getting drafted by the Toronto Blue Jays back in 2018. Prior to 2025, he appeared in just 20 MLB games. Last year, he split the season between Milwaukee and the Chicago White Sox, appearing in a career high 47 games and struggling at the plate. He ended up hitting a combined .125/.157/.177 with two doubles, one home run, and six RBIs.

Defensively, Capra has mainly played second base, shortstop and third base during his time in the majors but also has limited experience playing left field in the minors.

In the minors, he’s hit well enough to keep getting chances, having played in 511 career minor league games and hitting .270/.355/.397 with 111 doubles, 10 triples, 33 home runs, and 240 RBIs.

Max Ferguson

Acquired from San Diego as part of the Eric Hosmer trade, Ferguson quickly became organizational depth as he jumped from Greenville all the way to Worcester when the Triple-A team needed bodies at the end of the 2023 season. Since then, he’s been shuttled back and forth between Portland and Worcester the past two seasons depending on which team needed him more.

Offensively, there isn’t much to talk about. Little power and a high strikeout rate means Ferguson’s value will come from his glove. Though to at least partially make up for it, he tends to walk a decent amount. Last season, he played a career high 118 games between Portland and Worcester as he hit .205/.323/.313 with 13 doubles, one triple, nine home runs, and 42 RBIs.

In 2025 Ferguson, played every position besides catcher and pitcher at least once. The majority of his playing time came between second base and left field, however, moving between positions as needed.

Mikey Romero

A former first-round pick by the Red Sox in 2022, Romero dealt with injuries early on in his career before finally appearing fully healthy in 2025. Drafted as a shortstop, Romero has mostly played second base and third base since early 2025 and seems likely to have his best fit be at second base due to his arm.

Offensively, Romero has put together back-to-back decent seasons showcasing power in his game as he hit 16 home runs in 2024 and followed that up with 17 in 2025. Overall, he wound up hitting .245/.300/.452 in 111 games between Portland and Worcester in 2025. He also had 33 doubles, four triples, 17 home runs and 76 RBIs. Though, he does tend to strike out a lot as shown by 132 strikeouts.

Romero impressed during spring training in 2025 and now in 2026 has a chance to showcase his skills even further.

Tyler McDonough

Drafted in the third round of the 2021 draft, McDonough quickly made his way through the system, making it to Triple-A Worcester by the end of the 2023 season. Since then, he’s split time between Portland and Worcester, as he’s provided upper-minors depth for the organization while playing multiple positions.

Last year with Worcester, McDonough appeared in 79 games and hit .254/.328/.369 with 12 doubles, two triples, five home runs and 27 RBIs. He won’t hit for much power and is just average when it comes to zone contact and chasing but has good bat speed.

Defensively, the utility player saw time at second base, shortstop, right field, left field and appeared in one game in center field. He’s viewed as an above average, all-around fielder.

Red Sox Non-Roster Invitees: Outfielders

Allan Castro

Signed out of the Dominican Republic back in 2019, Castro was originally signed as an infielder before being moved to the outfield prior to his professional debut. Just 22 years old, Castro spent all of 2025 at Double-A where he played in 92 games and hit .268/.353/.400 with 20 doubles, two triples, seven home runs, and 37 RBIs.

Offensively, he improved from his 2024 numbers and showed growth as a hitter, though the switch hitter still has room to grow. While he doesn’t chase and has shown an ability to make contact on pitches in the zone, he still struggles against off-speed pitches and can get too aggressive.

Defensively, he split time between all three outfield positions, though the majority of his playing time came in center field where in 150 defensive chances he made just one error. With the Red Sox missing three outfielders due to the World Baseball Classic, Castro should see a lot of playing time early in camp.

Braiden Ward

Ward was acquired by the Red Sox in a Rule 5 Draft protection deadline trade, as they sent reliever Brennan Bernardino to the Rockies. Ward, who was drafted by the Rockies in 2021, split last season between Double-A and Triple-A where he appeared in 97 games. The utility player slashed .290/.395/.391 with 17 doubles, four triples, two home runs, 37 RBIs and he also stole 57 bases.

Offensively, Ward does not have much power as he’s hit just 14 home runs in 414 minor league games, but he puts the ball in play and has shown an ability to earn a walk. He’s at his best when taking advantage of his speed and using it to either stretch a hit or to steal a base.

Defensively, he mainly played center field and left field last year but got some action at both second and third base and will likely be used in a utility role. With Jarren Duran, Ceddanne Rafaela, and Wilyer Abreu all leaving camp to join the World Baseball Classic, Ward should see plenty of playing time.

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[mvp 78]

Some of these guys may contribute eventually, but I think none of them are on the BOS roster before Memorial Day. 

It would be really great if Romero cut down the k rate, but I think we're through the looking glass on that one.

Maybe one of Webb/Olds/Song can make a significant development leap this year.