Mariners Acquire Cooper Criswell
The Mariners announced that they have acquired right-hander Cooper Criswell from the Mets in exchange for cash considerations. He was designated for assignment this week when New York acquired Freddy Peralta and Tobias Myers from the Brewers. Left-hander Jhonathan Díaz has been designated for assignment by Seattle as a corresponding move for Criswell. Jorge Castillo of ESPN first reported that the Mariners would be acquiring Criswell. Ryan Divish of The Seattle Times reported the cash going the other way.
Criswell, 29, has the reputation of a serviceable swingman or back-end starter. His most extensive big league look came in 2024 with the Red Sox. He tossed 99 1/3 innings for Boston that year over 18 starts and eight relief appearances, allowing 4.08 earned runs per nine. His 17.2% strikeout rate wasn’t especially high but he limited walks to a 7.2% pace and induced grounders on 50.3% of balls in play.
Despite that solid season, he got pushed down the depth chart in 2025. The Sox acquired Garrett Crochet, signed Walker Buehler and got Lucas Giolito back from his injury absence. Criswell only made seven big league appearances last year. He spent most of the year in Triple-A, where he tossed 65 2/3 innings with a 3.70 ERA, 24.5% strikeout rate, 10.1% walk rate and 49.4% ground ball rate.
He exhausted his final option in 2025, pushing him to a fringe roster position. He and the Sox agreed to a deal in November, guaranteeing him $800K in 2026, even though he had not yet qualified for arbitration. That salary is only marginally above the $780K minimum in 2026.
The hope with a deal like that it would disincentivize other clubs from claiming him via waivers. It would also make Criswell less likely to elect free agency after clearing. He has a previous career outright and therefore has the right to reject further outright assignments in favor of the open market. But since he has less than five years of big league service time, he would have to walk away from the money in exercising that right.
That hasn’t gone as planned. The Sox designated Criswell for assignment in December but the Mets claimed him off waivers. As mentioned, the Mets bumped him off the roster this week. If they had any hope of passing him through waivers, the Mariners presumably called and told them it wouldn’t happen.
Seattle has a strong rotation but the depth isn’t amazing. The front five of Logan Gilbert, George Kirby, Bryan Woo, Bryce Miller and Luis Castillo is one of the best in the game. But beyond that group are guys like Logan Evans, Emerson Hancock and Blas Castano who haven’t yet proven themselves to be effective big leaguers. Switch-pitching prospect Jurrangelo Cijntje is on the way but he has only seven Double-A starts under his belt and hasn’t reached Triple-A yet.
Criswell gives the M’s a useful guy to add to the mix, though the roster fit is a bit tight at the moment. As mentioned, the club already has five good starters. Criswell could be in the bullpen as a long reliever but the relief group is also crowded. The Mariners currently project for an eight-man bullpen consisting of Andrés Muñoz, Matt Brash, Jose A. Ferrer, Eduard Bazardo, Gabe Speier, Carlos Vargas, Casey Legumina and Jackson Kowar. No one in that group can be optioned to the minors except for Brash or Ferrer and they’re too good to be sent down. Perhaps the M’s will try to pass Criswell, or someone else in that group, through waivers at some point for extra flexibility.
As for Díaz, the 29-year-old began today in the rotation depth group alongside Evans, Hancock and Castano but the Mariners evidently prefer Criswell to Díaz in that mix. Some websites list Díaz as still having a minor league option but he was optioned for extended stretches throughout the 2022, 2024 and 2025 seasons. Teams are sometimes granted a fourth option on a player but only if they don’t have five “full” professional seasons, where a “full” season is defined as 90 active days. Díaz first reached full season ball way back in 2017 and has been fairly active since then, so he shouldn’t qualify for a fourth option.
His major league track record is still fairly short. He has appeared in five big league seasons but with just 46 1/3 total innings pitched across those. He has a 4.66 ERA, 15.1% strikeout rate, 12.3% walk rate and 45.2% ground ball rate. He only made one big league appearance last year, spending the rest of the season on optional assignment with Triple-A Tacoma in the hitter-friendly Pacific Coast League. He gave that club 138 2/3 innings with a 4.15 ERA, 19.8% strikeout rate, 4.1% walk rate and 46.9% ground ball rate.
The lefty will be in DFA limbo for a week at most. The waiver process takes 48 hours, so the Mariners could field trade interest for as long as five days. He has a previous career outright and would therefore have the right to elect free agency if he were to clear waivers.
Photo courtesy of Eric Canha, Imagn Images
Mets Designate Cooper Criswell For Assignment
The Mets announced they’ve designated right-hander Cooper Criswell for assignment. They needed to clear a spot on the 40-man roster after tonight’s two-for-two trade because Jett Williams had not been on the roster.
Criswell has been a DFA casualty following a big trade twice this offseason. The Red Sox squeezed him out after the Jhostynxon Garcia/Johan Oviedo deal. The Mets grabbed him off waivers a day later but will now need to trade or waive him themselves. Criswell and the Red Sox had worked out an $800K contract early in the offseason.
While the righty locked in a fully guaranteed salary a little above the MLB minimum, that also pointed to a likely offseason DFA. It has become increasingly common for teams to work out slightly above minimum deals with players whom they’re considering dropping from the 40-man roster. The salary could serve as a minor deterrent for another team to place a waiver claim.
Perhaps more importantly, it gives the player incentive to accept a minor league assignment if they clear. The 29-year-old Criswell was outrighted by the Rays during the 2022 season. That gives him the right to decline future outrights in his career. It’s less likely that he’d walk away from guaranteed money, so the Mets could stash him in Triple-A if no other team places a claim.
Criswell had a decent season in a swing role in 2024. He logged a career-high 99 1/3 innings with a 4.08 earned run average. He doesn’t have huge velocity or swing-and-miss potential, but he threw strikes and got a decent number of ground-balls. He didn’t get nearly as much big league work last season. Criswell logged 17 2/3 frames with a 3.57 ERA over seven appearances. He spent the rest of the season at Triple-A Worcester, pitching to a 3.70 ERA with an above-average 24.5% strikeout rate across 65 2/3 frames.
Mets Claim Cooper Criswell
The Mets have claimed righty Cooper Criswell off waivers from the Red Sox, reports ESPN’s Jorge Castillo. Boston designated him for assignment just yesterday as a corresponding move after acquiring Johan Oviedo from the Pirates. (Boston needed 40-man spots for both Oviedo and minor league lefty Tyler Samaniego.) The Mets have not yet announced the claim, but they currently have a pair of 40-man vacancies, so they won’t need to make a corresponding move.
Though Criswell isn’t yet eligible for arbitration, the Sox had signed the right-hander to a fully guaranteed $800K deal for the upcoming season. As noted here at the time he signed, Boston’s hope in doing so was likely that Criswell’s lack of minor league options and a slightly higher-than-usual salary for a pre-arbitration player would help him pass through waivers so they could keep him as non-roster depth.
That didn’t work out for the Red Sox, but we’ve increasingly seen clubs take this tactic with fringe 40-man players who lack minor league options as a means of attempting to bolster their stash of experienced players in the upper minors. The Mets themselves could very well try the same with Criswell later in the offseason as their 40-man roster fills up.
The 29-year-old Criswell appeared in seven games for the Sox in 2025, logging 17 2/3 innings of 3.57 ERA ball but with only an 11.3% strikeout rate. He’s totaled 154 2/3 innings across parts of five major league seasons and carries a career 4.48 ERA, 16.7% strikeout rate and 7.1% walk rate between the Angels, Rays and Red Sox. He also tossed 65 2/3 innings of 3.70 ERA ball for the Sox’ Triple-A affiliate in Worcester this past season, working primarily as a starter.
If Criswell survives the offseason and spring training on the 40-man roster, he’d likely be looking at a swingman role if the Mets consider carrying him on the Opening Day squad. New York currently has Nolan McLean, David Peterson, Clay Holmes, Kodai Senga, Sean Manaea, Jonah Tong, Brandon Sproat and Christian Scott ahead of Criswell on the rotation depth chart. The Mets are also likely to further add to that group via free agency and/or trade, though it’s also possible that some of those names could be subtracted via trade. Senga, in particular, has seen his name pop up in recent rumors.
Red Sox Designate Cooper Criswell For Assignment
The Red Sox designated right-hander Cooper Criswell for assignment. They needed to open a spot on the 40-man roster to finalize this evening’s five-player trade with Pittsburgh.
Criswell and the Sox worked out an $800K contract last month. While the righty locked in a fully guaranteed salary a little above the MLB minimum, that also pointed to a likely offseason DFA. It has become increasingly common for teams to work out slightly above minimum deals with players whom they’re considering dropping from the 40-man roster. The salary could serve as a minor deterrent for another team to place a waiver claim. Perhaps more importantly, it gives the player incentive to accept a minor league assignment if they clear.
The 29-year-old Criswell was outrighted by the Rays during the 2022 season. That gives him the right to decline future outrights in his career. Criswell might have elected free agency had the Sox ran him through waivers earlier in the winter. It’s less likely that he’d walk away from guaranteed money, so the Sox could stash him in Triple-A if no other team places a claim.
Criswell had a decent season in a swing role in 2024. He logged a career-high 99 1/3 innings with a 4.08 earned run average. He doesn’t have huge velocity or swing-and-miss potential, but he threw strikes and got a decent number of ground-balls. He didn’t get nearly as much big league work this past season. Criswell logged 17 2/3 frames with a 3.57 ERA over seven appearances. He spent the rest of the season at Triple-A Worcester, pitching to a 3.70 ERA with an above-average 24.5% strikeout rate across 65 2/3 frames.
Alex Speier of The Boston Globe reported the move before the club announcement.
Red Sox, Cooper Criswell Agree To Deal For 2026
The Red Sox and righty Cooper Criswell have agreed to terms on a contract for the 2026 season, reports FanSided’s Robert Murray. Criswell, a client of Republik Sports, was already on the 40-man roster but wasn’t necessarily a lock to stick all offseason. He’s now agreed to a fully guaranteed $800K, per Murray, which greatly enhances his chances of staying in place.
Boston could still pass Criswell through waivers at some point this winter. He’s out of minor league options and would thus need to break camp with the club or else be designated for assignment. The fully guaranteed $800K, while only a bit north of the league minimum salary, makes it less likely that he’d be claimed by another club and also ensures that Criswell would accept an outright to the minors. He’d have the right to reject a minor league assignment upon clearing waivers by virtue of the fact that he’s been outrighted in the past, but he doesn’t have the service time necessary to reject and retain the remainder of that guarantee.
The 29-year-old Criswell appeared in seven games for the Sox this year, logging 17 2/3 innings of 3.57 ERA ball but with only an 11.3% strikeout rate. He’s totaled 154 2/3 innings across parts of five major league seasons and carries a career 4.48 ERA, 16.7% strikeout rate and 7.1% walk rate between the Angels, Rays and Red Sox. He also tossed 65 2/3 innings of 3.70 ERA ball for the Sox’ Triple-A affiliate in Worcester this season, working primarily as a starter.
While Criswell isn’t going to be penciled into next year’s rotation, he’ll be a depth option and could compete for a swing role in camp. Rotation help will be a focus for Red Sox chief baseball officer Craig Breslow this winter. Ace Garrett Crochet will again lead the rotation. He’ll be followed by Brayan Bello, but the rest of the group is more in flux. Kutter Crawford missed the entire season due to oblique and wrist injuries — the latter requiring surgery in July. Tanner Houck had Tommy John surgery this summer. Hunter Dobbins‘ season ended with an ACL tear. Lucas Giolito is a free agent.
Top prospects Payton Tolle and Connelly Early debuted late in the season and impressed to varying extents, but neither will simply be handed a rotation spot. Veteran Patrick Sandoval should be healthy after spending 2025 rehabbing from UCL surgery. Former top prospect Kyle Harrison, acquired in the Rafael Devers trade, will be in the mix — as will righty Richard Fitts. There are plenty of in-house options, but some of those names could move to the bullpen and others may need more time in Triple-A. Adding a playoff-caliber arm to the rotation mix seems likely, whether that addition comes via free agency or trade.
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 Select Nick Burdi
The Red Sox announced that they have selected the contract of right-hander Nick Burdi. Fellow righty Cooper Criswell has been optioned as the corresponding active roster move. To open a 40-man spot, righty Kutter Crawford has been transferred to the 60-day injured list.
Burdi, 32, signed a minor league deal with the Sox in the offseason. He has since been putting up some good numbers for Triple-A Worcester. Through 16 2/3 innings, he has only allowed one earned run, leading to a 0.54 ERA. He has struck out 38.5% of opponents while only giving out walks 7.7% of the time.
Throughout his career, the question has been more about health than talent. A former second-round pick of the Twins, he has twice had Tommy John surgery, once in 2017 and the second time in 2020. He also had a thoracic outlet syndrome surgery in between those two, in 2018.
He understandably didn’t pitch much from 2016 to 2022 but has been able to log some innings more recently. In 2023, he only pitched three big league frames but also got to 21 innings on the farm, with a 3.86 ERA and 35% strikeout rate. He also walked 15% of opponents that year, perhaps understandably rusty after so much missed time.
Last year, he pitched 9 2/3 major league innings for the Yankees with a 1.86 ERA as well as 17 Triple-A innings with a 2.65 ERA. At both levels, he had high strikeout totals but also a lot of walks. He missed time with a hip injury and was outrighted off the roster late in the season, which allowed the Red Sox to sign him.
It’s a small sample but Burdi’s start this year still features the same strikeout stuff but seemingly with better control. He’s averaging 96 miles per hour on his fastball while also throwing a slider and changeup. The Sox will add him as a fresh arm, at least for a few days. They only have a four-man rotation right now with Walker Buehler expected to be reinstated from the IL in the coming days, perhaps on Tuesday. Burdi has options, so it’s possible he’ll be sent down when Buehler is ready, depending on how things go between now and then. If he manages to stay healthy and post some big numbers in the majors, he can be retained beyond this season via arbitration if still on the 40-man roster.
As for Crawford, this doesn’t change anything with him. The 60-day count is retroactive to his initial placement on the 15-day IL. He landed there to start the campaign due to right patellar tendinopathy. He will be eligible for reinstatement in late May, but that doesn’t seem likely anyhow. He has been throwing lately but hasn’t yet begun a rehab assignment. Even if cleared to start that assignment soon, he would surely need a few weeks to ramp up as a sort of delayed spring training.
Photo courtesy of Brad Penner, 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 Place Liam Hendriks On 15-Day IL
March 28: Despite the season-opening IL placement, Hendriks is not facing a severe injury, Jen McCaffrey of The Athletic writes. He’s already been examined by Dr. Keith Meister, who performed his Tommy John surgery, and received a cortisone injection to help alleviate some inflammation and discomfort stemming from a compressed nerve. There’s no structural damage in Hendriks’ elbow. He’ll be shut down from throwing for three to five days but expects to resume throwing during next week’s series against the Orioles.
March 27: The Red Sox announced a slate of transactions to finalize their Opening Day roster, including a surprise placement of righty Liam Hendriks on the 15-day injured list due to elbow inflammation. Fellow right-hander Cooper Criswell, who had appeared ticketed for Triple-A Worcester, will instead break camp with the big league club.
Boston also selected the contracts of lefty Sean Newcomb and top prospect Kristian Campbell. Both have formally made the Opening Day roster. Lefties Chris Murphy and Zach Penrod were placed on the 60-day injured list to open spots. Murphy is recovering from UCL surgery performed last spring. Penrod was diagnosed with a left elbow sprain earlier in camp.
Additionally, the Red Sox placed Masataka Yoshida on the 10-day IL as he continues building back up from offseason shoulder surgery. Righties Brayan Bello (shoulder strain), Kutter Crawford (patellar tendinopathy) and Lucas Giolito (hamstring strain) were all placed on the 15-day IL, as expected.
Hendriks, who turned 36 last month, is entering the second season of a two-year, $10MM deal. The Red Sox signed him knowing that he’d miss most of all of the 2024 season while recovering from Tommy John surgery. The expectation early in camp was that he and offseason signee Aroldis Chapman could compete for ninth-inning work. The tide changed quickly. Chapman fanned 14 of the 30 batters he faced and held opponents to two runs in 7 1/3 innings. Hendriks allowed seven runs on 14 hits in just 6 1/3 frames. He didn’t walk anyone but also only whiffed four of the 32 hitters he faced.
The Red Sox haven’t yet provided a timetable for when Hendriks might return to the mound. For now, there’s no indication that he’s dealing with a long-term injury. Presumably, manager Alex Cora will have more information regarding his potential timetable when he meets with the media later today.
Red Sox’ Cooper Criswell Eligible For Fourth Option Year
The Red Sox’ pitching depth has more flexibility than might’ve been otherwise apparent at first glance. Right-hander Cooper Criswell exhausted his third and typically final option year in 2024, but Christopher Smith of MassLive.com reports that the Red Sox will actually hold a fourth option year on Criswell.
It’s standard in Major League Baseball for players to have three “option” years where they can be freely sent down to a minor league affiliate without first clearing waivers. An “option year” is used when any player on the 40-man roster is optioned to the minors and spends at least 20 days there. This applies even to players who’ve yet to make their big league debut but are optioned to a minor league affiliate out of spring training. However, the league grants a fourth option year for players who exhaust their three original three option years in fewer than five professional seasons (defined as 90-plus days on a major league or minor league active roster/injured list).
In the case of Criswell, he’s a 2018 draftee of the Angels who’s appeared in exactly five full seasons: 2019 and 2021-24. (He wasn’t on the roster for the abbreviated 2020 campaign.) The Halos originally selected him to the 40-man roster in 2021, and he was optioned in each of the three subsequent seasons throughout the course of stints with the Halos, Rays and Red Sox.
For the Red Sox, it’s a nice boon. Criswell goes from a back-end starter/swingman who’d have to be rostered on Opening Day to a valuable fifth/sixth starter who can be shuttled between their Triple-A affiliate in nearby Worcester and the major league roster. Criswell, who signed a big league deal with the Sox after being non-tendered by the Rays last winter, clearly pitched his way into the club’s plans with 99 1/3 innings of 4.08 ERA ball between the rotation and bullpen. He fanned a below-average 17.2% of opponents against a strong 7.3% walk rate and impressive 50.3% ground-ball rate.
Right now, the locks in the Boston rotation are Tanner Houck, Kutter Crawford and Brayan Bello. Veteran Lucas Giolito, once healthy, will eventually join them. Criswell, Quinn Priester and Richard Fitts are among the other options near the back of the rotation.
The Sox figure to add at least one starting pitcher via free agency and/or trade. They’ve been linked to the top names on the market already and have at least signaled a willingness to act more aggressively than in recent offseasons. Criswell’s extra option year gives them some flexibility and will help the team preserve depth if and when additional rotation arms are added in the weeks and months ahead.