Robert Stock Recommended For Thoracic Outlet Syndrome Surgery
Mets right-hander Robert Stock has been recommended for surgery to correct thoracic outlet syndrome, Stock told reporters (including Jon Heyman of the New York Post) this morning. Heyman adds that Stock indicated he’s suffering from the arterial TOS, and that he could potentially pitch before the end of the year. Stock was in camp with the Mets on a non-roster invite but is now facing a lengthy absence.
Stock, 36, has appeared in parts of five MLB seasons to this point in his career. A second-round pick by the Cardinals back in 2009, he made a strong impression with the Padres in 2018, his first season as a big leaguer. He posted a 2.50 ERA in 39 2/3 innings of work that year, but unfortunately he’s struggled at the big league level since then. In just 35 2/3 major league frames since, Stock sports a 7.57 ERA with nearly as many walks (31) as strikeouts (39). Stock did not appear in the majors from 2022-2024, instead bouncing between the KBO, the minor leagues, and independent leagues in both the United States and Mexico. In 2025, he returned to affiliated ball with the Red Sox. While he made just two abbreviated appearance in the majors, he pitched decently at Triple-A Worcester with a 3.92 ERA in 85 innings as a swing man.
That led Stock to sign a minor league deal with the Mets headed into 2026, and he figured to be a versatile depth option for the club’s pitching staff headed into the year. He’s pitched well so far this spring, including a strong three-inning appearance against the Marlins while preparing to pitch for Team Israel in the World Baseball Classic. Unfortunately, that outing ended with him reporting discomfort in his shoulder. That led to the MRI which ultimately revealed he was suffering from TOS. The specific kind of TOS Stock is suffering from is arterial TOS, the rarest form of the disorder. While baseball fans have become increasingly familiar with TOS in recent years, they’re likely to be more familiar with neurogenic TOS (the form of the disorder that players such as Stephen Strasburg and Chris Archer suffered from) and venous TOS, which Phillies star Zack Wheeler is currently working his way back from after being sidelined late last year by the disorder.
Arterial TOS is far less common than the other two versions, and its impacts on baseball players are far less widely understood; a 2024 study published in the American journal of sports medicine (link via NIH.gov) that looked at all 52 players who underwent surgical treatment for TOS between 2010 and 2017 notes that just one of those 52 players was suffering from arterial TOS. An article from Anthony Castrovince of MLB.com last month notes that arterial TOS can cause a feeling of coldness in the hand or even finger gangrene. Castrovince’s article notes that a return to play timeline of between nine and ten months is typical for pitchers who undergo surgery to correct TOS, though that can depend on the severity and form of TOS the player is facing. Stock’s hopes for his timeline are significantly more optimistic than that, as even a September return would be a turnaround of just six months.
Whether Stock is able to make it back to the mound this year or not, the Mets are fairly well equipped to handle losing him as a depth piece. Justin Hagenman, Christian Scott, and Jonathan Pintaro are all depth options for the rotation already on the 40-man roster, and that’s before considering top prospect Jonah Tong. As for the bullpen, the Mets have a deep group of non-roster invitees headlined by Craig Kimbrel, Adbert Alzolay, and Kevin Herget among others.
Mets Notes: Baty, Lindor, Scott, Minter, Stock
The Mets’ offseason signing of Bo Bichette displaced third baseman Brett Baty, and he’ll now take on a super utility role in Queens, MLB.com’s Anthony DiComo reports. Baty is seeing work in the outfield and at first base this spring. His experience at the hot corner and at second base makes him a viable option at both those positions, too, should Bichette or Marcus Semien need a breather or a trip to the injured list at any point.
“It’s a valuable role,” manager Carlos Mendoza tells DiComo. “We’ve been pretty honest with him. He is on board. There are going to be at-bats for him in a lot of different positions. He could play third, second and first, and now the outfield is in play.”
While Baty might not have a set position, his 2025 breakout should put him in good position to be in the lineup more often than not. The former first-round pick and top prospect shook off a terrible start to last season and finished out the year with a solid .254/.313/.435 batting line (111 wRC+) and 18 home runs. From mid-May through season’s end — a span of 370 plate appearances — Baty delivered a .266/.327/.454 batting line with 17 of his 18 long balls.
Elsewhere in Mets camp, the team is still holding out hope that star shortstop Francisco Lindor, who suffered a left hamate fracture early in camp, won’t miss much time — if he misses any at all. Lindor took batting practice yesterday for the first time since his injury, and he felt well enough after the fact to tell Jon Heyman of the New York Post he’s confident in his chances of being on the Opening Day roster.
“One hundred percent, I think I can make it for Opening Day,” said Lindor. “…We’re checking the boxes along the way.”
Lindor’s injury first came to light on Feb. 10. A day later, the Mets confirmed that he’d undergo surgery to address the issue. The team originally projected a six-week recovery, and Lindor’s surgery came 43 days prior to Opening Day. In addition to batting practice, Lindor also began playing catch this week and has yet to show any ill effects.
The recovery period on hamate fractures tends to range from four weeks on the short end to eight weeks on the longer end. Based on how things are progressing, it seems there’s reason for cautious optimism among Mets fans that the five-time All-Star and 2024 National League MVP runner-up will be in the lineup when new ace Freddy Peralta and the Mets host the Pirates and presumptive Opening Day starter Paul Skenes on March 26.
The Mets’ pitching staff is also navigating some injuries. Former top prospect Christian Scott, now 17 months removed from the 2024 Tommy John surgery that wiped out his 2025 season, hit 96 mph and tossed 48 pitches through 2 2/3 frames in an exhibition against Israel’s WBC team this week. Mendoza told the Post’s Dan Martin that the outing was “impressive, specifically touting the righty’s command in a walk-free return to the mound.
Scott, now 26 years old, made his big league debut in 2024 and posted a 4.56 ERA with 19.8% strikeout rate and 6.1% walk rate in his first taste of major league action. He’d previously tossed 42 1/3 innings with a 2.76 ERA, 33.5% strikeout rate and 7.3% walk rate at the Triple-A level. There’s no opening in the Mets’ rotation for him with Peralta, Nolan McLean, David Peterson, Clay Holmes, Kodai Senga and Sean Manaea all in the fold, but Scott will be a pivotal depth arm and one of the first names called if the Mets run into health troubles on their big league staff.
Left-handed reliever A.J. Minter, whose 2025 season ended in May due to lat surgery, pitched in a minor league game on a back field this week, Martin adds. It’s Minter’s first time back in a game setting since last year’s surgery. Previous indications have been that Minter could return at some point in May, but Mendoza indicated to Martin that late April is on the table for a possible return.
Minter signed a two-year, $22MM deal with the Mets last winter and got out to a terrific start for them. In 11 innings, he held opponents to two runs (1.64 ERA) on six hits and five walks with 14 punchouts. The 32-year-old southpaw has had his injury troubles over the years, but from 2020-25 he’s notched a sharp 2.80 earned run average with a 30% strikeout rate and 8% walk rate in 254 innings between the Braves and Mets.
In one other note related to the Mets, Tim Britton of The Athletic provides an update on non-roster invitee Robert Stock. The righty was recently with Team Israel for the World Baseball Classic but suffered some shoulder discomfort. He is out of the WBC and will be going for an MRI.
Mets Sign Robert Stock, Nick Burdi To Minor League Deals
The Mets have agreed to minor league contracts with pitchers Robert Stock, Nick Burdi and Anderson Severino and with outfielder Jose Ramos, according to SNY. Mike Rodriguez reported the Severino agreement a couple weeks ago, while Burdi’s deal first appeared on the MLB.com transaction log. Stock has confirmed his signing on social media. All four players receive invitations to big league camp.
Burdi and Stock each spent the 2025 season in the Red Sox organization. They both got brief looks in Alex Cora’s bullpen. Burdi tossed 5 1/3 scoreless innings with five strikeouts and a pair of walks over four appearances. The 32-year-old has good stuff but has never been able to stay healthy. He missed a couple months with a foot injury this year and has previously had thoracic outlet syndrome, two Tommy John surgeries, appendicitis, and hip issues. Burdi has a career 3.05 ERA with a 31.3% strikeout rate in 76 2/3 Triple-A innings. He has pitched in parts of six MLB campaigns but has yet to reach even 10 big league innings in a season because of the injuries.
Stock, 36, made two appearances for the Sox this year. He walked four batters and gave up three runs over 2 2/3 innings. Stock has worked as a reliever in MLB but started 15 of 19 outings at Triple-A Worcester. He tossed 85 innings with a 3.92 ERA while punching out an above-average 26.2% of batters faced. Stock hasn’t found much MLB success since turning in a 2.50 ERA over 32 appearances as a rookie with the 2018 Padres. He still sits in the mid-90s with his fastball and has intrigued various teams as a depth signing. Stock previously spent time in the Mets’ system, starting four Triple-A games for the organization in 2021.
Severino is a 31-year-old lefty reliever who pitched six times for the White Sox in 2022. He has spent the past two seasons pitching in the Mexican League. Severino has tossed eight innings of two-run ball with 11 punchouts in the Dominican Winter League to get back to affiliated ball. Ramos, 25 in January, has never played in the majors. He spent seven seasons in the Dodgers’ system and combined for a .251/.326/.456 batting line between their top two minor league affiliates in 2025. The right-handed hitter changes organizations for the first time as a minor league free agent.
Red Sox Outright Robert Stock
The Red Sox announced today that right-hander Robert Stock cleared waivers and has been outrighted to Triple-A. He was designated for assignment by the club earlier this week.
It’s the second time the 35-year-old has been outrighted to the minors by Boston this year. He previously threw two innings for the club in an appearance earlier this year and was outrighted off the 40-man roster shortly thereafter. It was a similar story this time around, as he spent just two days on the roster and made a single appearance before being cut from the club’s roster.
Drafted by the Cardinals in the second round of the 2009 draft, Stock didn’t make his big league debut until he was with San Diego in 2018. Stock was nothing short of excellent in his first taste of the majors with a 2.50 ERA and 2.71 FIP across 39 2/3 frames. Unfortunately, he’s never come close to that in the majors in the years since. While pitching for the Padres, Red Sox, Cubs, and Mets from 2019 to 2021, he surrendered a 7.36 ERA and 5.50 FIP in 33 innings of work. Following the 2021 season, Stock departed affiliated ball to pitch as a starter for the KBO League’s Doosan Bears throughout the 2022 campaign.
That stop in South Korea went fairly well for Stock, as he posted a 3.60 ERA in 165 innings of work. Even that solid figure pales in comparison to the top imported arms in the KBO league, though, so it wasn’t exactly a shock when he didn’t return to the Bears for 2023. Instead, he wound up pitching for the Atlantic League’s Long Island Ducks and the Mexican League’s Tecolotes de los Dos Laredos (along with a brief stint in the Brewers’ minor league system) in 2023 and ’24 before he settled back in with the Red Sox at Triple-A Worcester this year. He’s posted a 3.09 ERA for the WooSox in 55 1/3 innings of work across 12 appearances last year, nine of which have been starts.
Those strong results at Triple-A obviously haven’t translated to results at the big league level, where Stock has surrendered three runs in 2 2/3 innings of work this year while walking four batters and striking out just one. Lackluster as Stock’s results have been at the big league level, however, there’s always a place for a versatile veteran capable of eating innings out of either the rotation or bullpen as necessary on a club’s minor league depth chart. Given that, it’s hardly shocking that the Red Sox decided to outright the right-hander to the minors and keep him in the fold as an emergency depth option who they can call back up to the majors when they need an extra arm to provide some length out of the bullpen or an emergency starter. Until that happens or the 2025 campaign comes to a close, Stock figures to remain a member of the Triple-A pitching staff who provides non-roster depth for Boston going forward.
Red Sox Designate Robert Stock For Assignment, Select Brian Van Belle
The Red Sox announced that they have selected the contract of right-hander Brian Van Belle. He will take the roster spot of fellow righty Robert Stock, who has been designated for assignment.
Stock, 35, was just added to the roster a couple of days ago. Facing the Yankees on Friday, starter Walker Buehler only lasted two innings, in a game that finished in a 9-6 loss. Zack Kelly and Brennan Bernardino came in after Buehler before Cooper Criswell mopped up the final three frames.
Criswell likely wasn’t going to be available for a few days, so the Sox optioned him down and brought up Stock to give the bullpen a fresh arm. In last night’s 11-7 victory over the Yanks, the Sox used eight pitchers to get the necessary 27 outs, leaving them in a somewhat taxed position going into tonight’s contest against the Rays.
Stock was one of those eight pitchers and he wasn’t terribly efficient. He was put into the game in the bottom of the ninth with an 11-5 lead. He faced six batters, only retiring two of them, while throwing 30 pitches. Closer Aroldis Chapman had to come in and get the final out.
That’ll get Stock bumped off the roster for the second time this year. He signed a minor league deal with the Sox in the winter and was also called up in April, under somewhat similar circumstances. Boston had just played a doubleheader and wanted a fresh arm. Stock made one appearance and was designated for assignment right after. He cleared waivers and stuck with the club, which allowed him to come back up in recent days. It’s possible that the same sequence of events plays out in the coming days. Stock has a 10.13 earned run average in those two big league outings this year but a solid 3.09 ERA in Triple-A.
Van Belle, 28, has never been a huge name among prospect evaluators but is having a good season. An undrafted free agent in 2020, he has climbed the minor league ladder and been in Triple-A since 2023. This year, he has logged 51 innings over eight starts and four relief appearances with a 2.29 ERA. His 20% strikeout rate isn’t strong but his 3.4% walk rate is tiny and he’s been getting ground balls on 51.7% of balls in play.
As mentioned, the pitching staff got a lot of work yesterday. Van Belle will replace Stock and give the club a fresh arm capable of tossing multiple innings. He’ll be making his major league debut as soon as he gets into a game.
Photo courtesy of David Butler II, Imagn Images
Red Sox Select Robert Stock, Place Josh Winckowski On 60-Day IL
The Red Sox announced this afternoon that they’ve selected the contract of Robert Stock. Right-hander Cooper Criswell was optioned to the minors to make room on the active roster, as was previously reported by Ian Browne of MLB.com. Making room for Stock on the 40-man roster is right-hander Josh Winckowski, who was recalled to the majors and placed on the 60-day injured list with a flexor strain in his right elbow.
Stock, 35, joins the Red Sox bullpen for the second time this year. He previously threw two innings for the club in an appearance earlier this year but was outrighted off the 40-man roster shortly thereafter. A second-round pick by the Cardinals all the way back in 2009, Stock didn’t debut in the majors until 2018 as a member of the Padres. He turned in a dominant showing during his first year in the majors, with a 2.50 ERA and 2.71 FIP across 39 2/3 innings of work, but has never reached those heights since. He bounced between San Diego, Boston, Chicago, and Queens over the next three seasons but didn’t get much in the way of results with a 7.36 ERA (5.50 FIP) in 33 frames between 2019 and 2021.
Following the 2021 season, Stock departed affiliated ball to pitch as a starter for the KBO League’s Doosan Bears in 2022. He posted a 3.60 ERA in 165 innings of work but did not remain in Asia beyond that season, instead returning to North America to pitch for the Atlantic League’s Long Island Ducks and the Mexican League’s Tecolotes de los Dos Laredos. Stock finally returned to affiliated ball with the Red Sox on a minor league deal this year, where he’s pitched to a 3.09 ERA in 55 1/3 innings of work at Triple-A in addition to his brief stint in the majors. Now he’ll once again be tasked with helping fill the gaps in the Red Sox pitching staff, and perhaps can provide some length for the club out of the bullpen.
Making room for Stock on the active roster is Criswell, a right-hander with a similar ability to pitch in a variety of roles. After spending parts of three seasons with the Angels and Rays early in his career, Stock arrived in Boston last year settled into a swing role with the big league club that saw him pitch to a solid 4.08 ERA (104 ERA+) with a 4.15 FIP in 99 1/3 innings last year. Those frames were split between the bullpen and rotation, with 18 of his 26 MLB appearances last year being starts. Things haven’t gone as well for Criswell this year, however as he’s struggled badly in six innings with eight runs (five earned) allowed and as many walks (two) as he has strikeouts. He’ll head to Triple-A where the Red Sox will try to help him get right so he can contribute to the pitching staff later in the season.
Meanwhile, Stock will take the 40-man roster spot of Winckowski. The right-hander debuted with the Red Sox back in 2022 as a back-end starter but since then has been a very effective multi-inning reliever, with a 3.51 ERA and 4.10 FIP in 172 innings since the start of the 2023 campaign. That includes a 3.86 ERA in six outings for the big league club earlier this year, but he’s been at Triple-A for over a month now. Winckowski last appeared in a Triple-A game on May 11 and had been on the shelf in the minors with elbow inflammation, but the club clearly does not expect him back any time soon as he’ll now not be eligible to return from the shelf until early August.
Red Sox Outright Robert Stock
Right-hander Robert Stock has been outrighted to Triple-A Worcester, according to his transactions tracker at MLB.com. That indicates he cleared waivers after being designated for assignment earlier this week.
Players have the right to reject an outright assignment and elect free agency if they have at least three years of major league service time or a previous career outright. Stock meets the latter criterion but it’s not clear if he will exercise his right. He could return to the open market or stick with the Sox as non-roster depth.
He just had a very brief stay on Boston’s roster, his first time in the big leagues in years. He wasn’t in the majors at any point during the 2022-2024 seasons but he put up some good numbers in Mexico last year. That led the Sox to give him a minor league deal. They played a doubleheader on Sunday with one game going to extra innings.
They added Stock on Monday to give the bullpen a fresh arm. That night, the Sox found themselves losing 5-1 to the Blue Jays after seven innings, so Stock was sent in to mop up the final two frames. He gave up three hits and issued one walk, leading to one run as the Sox lost 6-2. He was designated for assignment the next day.
The Sox ended up going to extras on Wednesday and Thursday as well. They don’t have another off-day until the 17th and then play another ten straight after that. Perhaps they may need a fresh arm in the bullpen again soon but they also might be able to strengthen the staff with Lucas Giolito and Brayan Bello, who are both currently on rehab assignments and almost ready to rejoin the big league club. That could push Richard Fitts or Sean Newcomb from the rotation into a long relief role.
Stock now has 74 2/3 innings in the majors, most of that coming from 2018 to 2021. Overall, he has a 4.70 earned run average, 22.5% strikeout rate, 12.1% walk rate and 49.3% ground ball rate. He pitched in Korea in 2022 then split 2023 between the minors and Indy Ball. Last year, he had a 3.38 ERA over 19 starts for Tecos de los Dos Laredos in the Mexican League. He then remained in Mexico for the winter ball season to put up a 1.60 ERA for Naranjeros de Hermosillo, which led to a minor league deal with the Red Sox.
Photo courtesy of David Butler II, Imagn Images
Red Sox Designate Robert Stock For Assignment
The Red Sox announced a series of roster moves today. Catcher Connor Wong was placed on the injured list with Blake Sabol recalled, a pair of moves that were reported last night. They also made a move on the pitching side, recalling right-hander Josh Winckowski with fellow righty Robert Stock designated for assignment.
Stock, 35, was just added to Boston’s roster yesterday. The club had played a doubleheader on Sunday, with one of the two games going to extra innings. With the pitching staff fairly taxed, Stock was brought up to give them a fresh arm in case they needed someone to cover multiple relief innings.
That’s exactly what ended up happening, as the Sox were down 5-1 to the Blue Jays after seven innings last night. Stock mopped up the final two frames, allowing one earned run on a walk and three hits, with the Sox eventually losing 6-2. Perhaps Stock was not going to be available for tonight or tomorrow, so the Sox have bumped him off the roster and replaced him with Winckowski.
They will now have a maximum of one week of DFA limbo to see what’s next for Stock. The waiver process takes 48 hours, so Boston could potentially take five days to assess any trade interest. Last night’s performance was his first big league action since 2021. He spent 2022 pitching in Korea, 2023 in the minors and Indy Ball, then spent 2024 in Mexico.
Including last night’s game, he now has a 4.70 earned run average in 74 2/3 major league innings. For what it’s worth, he was quite good in Mexico over the past year. He posted a 3.38 ERA in 98 2/3 innings over 19 starts for Tecos de los Dos Laredos last year. He then stayed in Mexico for some winter ball, logging 84 1/3 innings over 14 starts for Naranjeros de Hermosillo with a 1.60 ERA. That led to a minor league deal with the Red Sox and yesterday’s return to the majors after a long absence.
Photo courtesy of David Butler II, Imagn Images
Red Sox Select Robert Stock
The Red Sox announced that they have selected the contract of right-hander Robert Stock. Fellow righty Cooper Criswell was optioned to Triple-A Worcester to open an active roster spot. The Sox had a 40-man vacancy after trading Quinn Priester to the Brewers earlier today.
If Stock gets into a game, it will be his first big league appearance in years. He pitched in the bigs from 2018 to 2021 but has been away from the show since then. During that previous stretch in the majors, he pitched for the Padres, Red Sox, Cubs and Mets. He tossed 72 2/3 innings, allowing 4.71 earned runs per nine. He struck out 23.1% of batters faced, gave out walks to 12.2% of opponents and got grounders on 49.8% of balls in play.
He has continued playing baseball since then, travelling the globe in the process. In 2022, he made 29 starts for the Doosan Bears in the KBO League in Korea, posting a 3.60 ERA. He was back in North America in 2023, having signed a minor league deal with the Brewers. But he got lit up in 23 innings, posting an 8.22 ERA, before getting released and landing in Indy Ball.
He pitched for Tecos de los Dos Laredos of the Mexican League last year, putting up a 3.38 ERA in 98 2/3 innings over 19 starts. He hung around in Mexico for winter ball, playing for Naranjeros de Hermosillo. He tossed 84 1/3 innings in 14 starts for that club with a 1.60 ERA, prompting the Red Sox to sign him to a minor league deal in January. He logged three spring innings for the Sox, allowing four earned runs. He then reported to Triple-A Worcester, tossing 8 1/3 scoreless innings over one start and one long relief appearance.
For the Sox, Saturday’s game against the Cardinals was postponed by the weather, forcing a Sunday doubleheader. The Sox won both games yesterday but one of them went to ten innings. They used nine pitchers on the day overall. Criswell threw the final three innings of the nightcap and likely wouldn’t have been available for the next few days.
With the group fairly taxed, Stock has been added to give the bullpen an extra guy capable of throwing multiple innings. If another fresh arm is needed in the coming days, Stock is out of options. That means he would have to be bumped off the 40-man in order to be removed from the active roster.
Photo courtesy of Rick Cinclair, Imagn Images.
Red Sox, Robert Stock Agree To Minor League Deal
The Red Sox and right-hander Robert Stock have agreed to a minor league deal with an invite to major league spring training, reports Chris Cotillo of MassLive. Naranjeros de Hermosillo, the Mexican winter ball team Stock had been playing for, had previously announced that Stock was leaving to conduct physical exams with the Sox.
Stock, 35, has a bit of major league experience. From 2018 to 2021, he tossed 72 2/3 innings over four seasons, suiting up for the Padres, Red Sox, Cubs and Mets. He allowed 4.71 earned runs per nine. His 23.1% strikeout rate was around average and his 49.8% ground ball rate was strong, but he also gave out walks at a high rate of 12.2%. His fastball averaged 96-98 miles per hour in that time.
He hasn’t been in the majors for a few years now but has performed well in other places. He spent 2022 in Korea, posting a 3.60 ERA over 29 starts for the Doosan Bears of the KBO League. That was enough to get him another shot in affiliated ball, as he signed a minor league deal with the Brewers for 2023. But he had an 8.22 ERA in 23 innings and was in Indy Ball by June.
For 2024, he signed with the Tecos de los Dos Laredos of the Mexican League. He made 19 starts and tossed 98 2/3 innings with a 3.38 ERA. As mentioned, he has been playing winter ball with the Naranjeros, posting great numbers there. He tossed 84 1/3 innings over 14 starts for them with a 1.60 ERA.
For the Sox, there’s no harm in bringing him aboard via a minor league deal to see how he looks in camp. He was a reliever for most of his career but has been starting in more recent years, so he should be able to provide the club with non-roster depth in both areas.
Boston projects to have a rotation of Garrett Crochet, Tanner Houck, Brayan Bello, Kutter Crawford and Walker Buehler, with Lucas Giolito returning from his elbow surgery at some point this year as well. There’s lots of talent in there but also plenty of question marks. In the bullpen, they lost Kenley Jansen and Chris Martin to free agency, though they have signed free agents Aroldis Chapman and Justin Wilson. They are also set to get Liam Hendriks and Garrett Whitlock back from extended absences due to elbow surgeries.