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Mariners Rumors

Mariners Place Logan Gilbert On 15-Day IL, Plan To Select Logan Evans; Casey Lawrence DFA’d

By Leo Morgenstern | April 27, 2025 at 11:58am CDT

TODAY: Evans has officially been selected to the roster ahead of his start today. Saucedo was optioned to Triple-A in the corresponding move.

April 26: The Mariners placed right-hander Logan Gilbert on the 15-day injured list today with a flexor strain in his pitching elbow. Additionally, Seattle designated right-hander Casey Lawrence for assignment and recalled right-hander Troy Taylor and left-hander Tayler Saucedo from Triple-A.

Losing Gilbert for any period of time is a tough blow for the Mariners. Thankfully, however, he seems to have avoided the worst. He exited his most recent start with the always ominous-sounding “forearm tightness,” and the M’s anxiously awaited the results of his MRI. Yet, his injury has been diagnosed as a Grade 1 (a.k.a. mild) strain. According to Daniel Kramer of MLB.com, the righty will be shut down for two weeks before being re-evaluated. While there is no timeline for his return, Gilbert seems optimistic. He told reporters (including Kramer) that the injury wasn’t “really bad” and said he feels “better today already than I did yesterday.”

Gilbert has been one of the most durable and productive starters in the American League since his debut in May 2021. In that time, he has a 3.55 ERA, a 3.56 SIERA, a 4.84 strikeout-to-walk ratio, and he is tied for first among AL pitchers in starts. After making his first All-Star appearance and earning some Cy Young votes last season, he has looked better than ever in 2025, with a 2.37 ERA through six starts. His 1.87 SIERA and 37.6% strikeout rate both rank first among qualified pitchers.

Taylor and Saucedo are relievers, so neither is a replacement for Gilbert. Having the two of them on the active roster will simply offer manager Dan Wilson some additional bullpen depth tonight against the Marlins. Instead, the Mariners will replace one Logan with another, as Adam Jude of The Seattle Times reports that pitching prospect Logan Evans will make his major league debut tomorrow. Gilbert’s turn in the rotation wouldn’t have come again until Friday against the Rangers, and thanks to off days coming up on Monday and Thursday, Seattle theoretically could have survived with a four-man rotation until May 6. Instead, however, they will give the ball to Evans tomorrow afternoon.

The Mariners selected Evans late in the 2023 draft, but the young righty put up strong numbers as he pitched his way through the minor league system. Entering the season, Baseball America ranked him as Seattle’s eighth-best prospect, describing him as a “safe No. 3 or 4 starter who should be able to post strong innings totals every season.” Keith Law of The Athletic had a similar evaluation, ranking Evans tenth in the organization and writing, “He’s at least a No. 4, though, and I’ll bet on any pitcher who’s already shown this kind of capacity to make adjustments.” His stuff isn’t overpowering, but his arsenal is deep, and his above-average abilities to throw strikes and induce grounders should help him pitch deep into games. Through five starts at Triple-A in 2025, he has a 3.86 ERA and 2.90 FIP in 25 2/3 innings of work.

Lawrence has already been DFA’d by the Mariners twice this year. After first pitching for the Mariners from 2017-18, he returned in 2024 and spent the season at Triple-A Tacoma. He re-upped with the club on another minor league pact this offseason and has so far pitched 10 innings over two separate stints in the majors, giving up 11 runs, but only four earned runs, in that time. He took over for Gilbert on Friday after he exited early and ate five innings for the Mariners in an 8-4 loss. That surely explains why he was DFA’d; he won’t be able to pitch for several days, and the Mariners’ bullpen would have been thin had they kept him around. Considering he has already cleared waivers, elected free agency, and re-signed with Seattle twice this season, there’s a good chance that’s exactly what will happen again.

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Seattle Mariners Transactions Casey Lawrence Logan Evans Logan Gilbert

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Logan Gilbert Likely Headed For MRI With Forearm Tightness

By Anthony Franco | April 25, 2025 at 11:26pm CDT

11:26pm: Gilbert told reporters (including Adam Jude of The Seattle Times) that he expects to go for an MRI tomorrow.

9:59pm: The Mariners announced that Logan Gilbert exited tonight’s start against the Marlins with forearm tightness. Gilbert had fired three perfect innings with a trio of strikeouts. He was lifted for Casey Lawrence to begin the fourth.

Gilbert’s fastball was in the 94-95 MPH range throughout the night. His final heater checked in at 95.4 MPH, right in line with his 95.6 MPH season average. The stuff still seemed sharp, but the M’s are obviously going to be extremely cautious with any kind of forearm discomfort. Gilbert entered play tonight with a 2.63 earned run average and 41 strikeouts through his first 27 1/3 innings. It was an even more impressive start than last year, when he landed sixth in AL Cy Young balloting after posting a 3.23 ERA over an MLB-high 208 2/3 frames.

Skipper Dan Wilson will presumably provide more information postgame. It’s impossible to know the severity this soon, but it’s a concerning development anytime a top pitcher experiences forearm discomfort. It wouldn’t be a surprise if the Mariners send Gilbert for imaging over the weekend.

Seattle opened the season without star righty George Kirby, who battled shoulder inflammation early in Spring Training. Kirby progressed to throwing a bullpen session before tonight’s game, his first mound work after a six-week shutdown (link via Daniel Kramer of MLB.com). He’s expected to throw live batting practice next week. Kirby appears to be progressing nicely, but he’s certainly still weeks away from a return to major league action.

Luis Castillo, Bryan Woo and Bryce Miller have filled their customary mid-rotation spots behind Gilbert. The final rotation spot has been a struggle in Kirby’s absence. Luis F. Castillo allowed seven runs in as many innings over two starts. Emerson Hancock has given up 10 runs across 11 2/3 frames in three outings.

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Seattle Mariners George Kirby Logan Gilbert

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Gregory Santos To Undergo Cleanup Knee Surgery

By Anthony Franco | April 25, 2025 at 8:54pm CDT

The Mariners placed Gregory Santos on the 15-day injured list this afternoon. Seattle announced that the reliever is dealing with right knee inflammation. Adam Jude of The Seattle Times relays that Santos will undergo a cleanup surgery to repair cartilage next week.

Seattle announced last week that Santos would be optioned to Triple-A. It seems they subsequently learned of his knee discomfort. Santos didn’t make an appearance in the minors. Players who were injured while in the majors cannot be optioned, so the option was rescinded and he lands on the MLB injured list instead.

The return timeline isn’t clear, though GM Justin Hollander said the team expects he’ll make it back before the end of the season (video provided by Marine Layer Podcast). It wouldn’t be all that surprising if he winds up on the 60-day injured list when the team needs a 40-man roster spot, though.

The M’s acquired Santos from the White Sox over the 2023-24 offseason. He’d posted a 3.39 ERA over 60 appearances in his lone season in Chicago. His tenure in the Pacific Northwest has been marred by injury. Santos suffered a lat strain midway through his first Spring Training. That shelved him into July. He went back on the injured list a few weeks later with biceps inflammation and finished the year with all of eight appearances.

Santos has made eight appearances this year as well. He’s allowed six runs (four earned) on eight hits and eight walks. He hasn’t recorded a single strikeout among 36 batters faced. The Mariners will hope for something more closely resembling his 2023 form after the knee surgery. Santos figures to eclipse three years of major league service during the season and will qualify for arbitration next winter.

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Seattle Mariners Gregory Santos

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Mariners Select Casey Lawrence

By Darragh McDonald | April 23, 2025 at 2:40pm CDT

The Mariners announced that they have selected the contract of right-hander Casey Lawrence. Fellow righty Sauryn Lao was optioned to Triple-A Tacoma in a corresponding active roster move. To get Lawrence onto the 40-man, outfielder Víctor Robles was transferred to the 60-day injured list. Robles suffered a left shoulder dislocation a couple of weeks ago and isn’t expected back for several months.

Lawrence and the Mariners seem to have an arrangement that is working for both of them. The season is only a few weeks old but this is already the third time he has been selected to the roster. He signed a minor league deal with the M’s in the winter and was called up to the majors on April 9th. A few days later, he was designated for assignment, cleared waivers and elected free agency. He returned on a fresh minor league deal and was back on the roster by April 18th. Once again, he was quickly DFA’d and cleared waivers but is now back on the roster a third time.

Around those transactions, he has served as a multi-inning reliever for the club. He has logged five innings across three appearances thus far, having allowed two earned runs. By continually shuffling him on and off the roster, the Mariners can keep fresh arms moving in and out of the bullpen.

Lawrence is out of options, which necessitates him continually being removed from the 40-man. He has the right to elect free agency as a player with a previous career outright but seems content to circling back to the Mariners each time. From his perspective, he gets to add a bit of major league pay and service time, not a bad outcome for a 37-year-old journeyman.

Emerson Hancock, the least established member of the Seattle rotation, takes the ball tonight for the M’s at Fenway Park. If he gets into trouble, Lawrence will likely be called upon to sop up some innings and save the rest of the bullpen before tomorrow’s day game.

Photo courtesy of Stephen Brashear, Imagn Images

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Seattle Mariners Transactions Casey Lawrence Sauryn Lao Victor Robles

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Casey Lawrence Elects Free Agency

By Nick Deeds | April 22, 2025 at 9:49pm CDT

April 22: Seattle announced on Tuesday that Lawrence cleared waivers and was outrighted back to Triple-A Tacoma. According to the MiLB.com transaction log, he elected free agency. There’s a decent chance he’ll re-sign with the Mariners on another minor league deal, as he did after electing free agency last week.

April 20: The Mariners announced this morning that they’ve designated right-hander Casey Lawrence for assignment. Right-hander Sauryn Lao was selected to the roster to replace Lawrence on the 40-man and active rosters.

Lawrence, 37, is a journeyman who has pitched in parts of five MLB seasons. After signing with the Blue Jays as an undrafted free agent back in 2010, the right-hander spent years climbing up the minor league ladder before finally reaching the majors during the 2017 season. He struggled to a 6.64 ERA with a 5.08 FIP in 78 2/3 innings of work for the Jays and Mariners over the next two years before heading overseas to pitch for Nippon Professional Baseball’s Hiroshima Carp in 2019. Lawrence posted a 4.80 ERA in 110 2/3 innings of work for the Carp and did not pitch professionally during the 2020 season.

He resurfaced in Toronto during the 2021 season and has oscillated between the majors and Triple-A in the years since then, with a 6.62 ERA and 6.12 FIP across 50 1/3 innings between the Blue Jays, Cardinals, and Mariners. His most recent stint in Seattle has seen the right-hander post five innings of three-run (two earned) ball, though he’s failed to strike out any of the 20 batters he’s faced. The Mariners will have one week to work out a trade involving Lawrence or pass him through waivers, and if he goes unclaimed he’ll have the option to either accept and outright assignment back to the minor leagues or elect free agency in search of a better deal elsewhere.

Lawrence’s departure makes room for Lao on the active and 40-man rosters. Signed by the Dodgers out of the Dominican Republic back in 2016, Lao was initially signed as a corner infielder but converted to pitching after struggling to hit at the High-A level. He made his first pitching appearances in 2023 and looked good enough to reach the Double-A level, and last year dominated Double-A to the tune of a 1.90 ERA in 20 relief appearances before getting promoted to Triple-A. The inflated offensive environment of the Pacific Coast League was not kind to Lao, as he surrendered a 5.22 ERA in 29 1/3 innings of work. That was his last work in a Dodgers uniform, as he elected minor league free agency and signed with Seattle.

He’s made three abbreviated starts for Seattle so far at Triple-A, and looked good in doing so with a 2.00 ERA and a 21.2% strikeout rate against a walk rate of just 3%. Lao figures to serve as a long man for the Seattle bullpen, offering bulk relief to the club now that Lawrence is off the roster and Emerson Hancock has taken up a rotation job. Lao figures to be especially important for the Mariners in the coming days after the club went 12 innings against the Blue Jays last night, only five of which were handled by starter Logan Gilbert.

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Seattle Mariners Transactions Casey Lawrence Sauryn Lao

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Cubs Acquire Drew Pomeranz From Mariners

By Anthony Franco | April 21, 2025 at 8:14pm CDT

8:14pm: While the team announced that Pomeranz would report to Triple-A Iowa, that’s evidently a temporary assignment. Patrick Mooney and Ken Rosenthal of The Athletic report that the Cubs are likely to call him up on Wednesday.

7:47pm: The Cubs officially announced to media (including Marquee’s Taylor McGregor) that they’ve acquired Pomeranz for cash considerations.

6:10pm: The Mariners are trading reliever Drew Pomeranz to the Cubs, reports Ken Rosenthal of The Athletic. The veteran southpaw had been pitching in Triple-A with Seattle. According to Rosenthal, Pomeranz’s deal contained an upward mobility clause that required the Mariners to either call him up or trade him if another team was willing to offer him a big league roster spot.

That suggests the Cubs will call Pomeranz up for what’d be his first major league appearance in four years (assuming he makes it into a game). He was very briefly in the big leagues last season, as he spent four days on the Giants’ roster last May. San Francisco skipper Bob Melvin didn’t get him into a game before he was designated for assignment and outrighted off the roster. Pomeranz elected free agency upon clearing waivers and sat out the remainder of the season.

The 36-year-old signed a minor league deal with Seattle in December. He was granted his release at the end of Spring Training but promptly returned on a new non-roster pact. He has allowed six runs, five of them earned, through 9 2/3 innings with their Tacoma affiliate. Pomeranz has given out eight free passes (six walks and two hit batters) but he’s punched out 14 of 43 opponents. He’s getting swinging strikes at a decent 11.8% clip while working with a 92 MPH fastball and a low-80s knuckle-curve.

Chicago was intrigued enough by the stuff to give Pomeranz a look despite the wobbly command. He has some familiarity with skipper Craig Counsell. Pomeranz had a breakout half-season in Milwaukee while Counsell was managing the Brewers in 2019. He recorded 45 strikeouts in 26 1/3 innings after a deadline trade with San Francisco. That led the Padres to sign him to a surprising four-year, $34MM free agent deal the following offseason. The investment didn’t work, as injuries and the shortened 2020 schedule limited him to 47 appearances over the life of that contract.

According to the MLB.com transaction log, the Cubs optioned Jordan Wicks to Triple-A Iowa. That’ll apparently be the corresponding active roster move. They’ll need to add Pomeranz to the 40-man roster as well, though they can move Justin Steele to the 60-day injured list to open that spot.

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Chicago Cubs Seattle Mariners Transactions Drew Pomeranz

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Looking Ahead To Club Options: AL West

By Anthony Franco | April 18, 2025 at 9:10pm CDT

Over the coming days, MLBTR will look at next offseason’s option class. Steve Adams highlighted the players who can opt out of their current deals, while we’ll take a division-by-division look at those whose contracts contain either team or mutual options. Virtually all of the mutual options will be bought out by one side. Generally, if the team is willing to retain the player at the option price, the player will decline his end in search of a better free agent deal.

We started with a look at the NL West yesterday. While every team in that division had at least one player whose deal contained a club or mutual option, its American League counterpart only has two teams that are slated to have any option decisions.

Athletics

  • None

Houston Astros

  • None

Los Angeles Angels

  • Kevin Newman, SS ($2.5MM club option, $250K buyout)

The Angels brought in Newman on a $2.75MM contract early last offseason. The contact-hitting infielder was coming off a solid .278/.311/.375 slash over 111 games in a utility role in Arizona. He added necessary shortstop depth with Zach Neto opening the season on the injured list after last fall’s shoulder surgery. Newman had a rough Spring Training, though, and the Angels went with minor league signee Tim Anderson as their primary shortstop until Neto’s return tonight.

Newman’s cold spring has carried into his early regular season work. He has managed three hits, all singles, without taking a walk in 23 trips to the plate. Newman has never walked much or hit for any kind of power, but he generally puts the ball in play and can move around the infield. Neto’s return means he won’t get much playing time at shortstop, while Kyren Paris and Luis Rengifo are respectively getting the majority of work at second and third base.

Note: José Quijada and Evan White each have club options on their respective contracts. They’ve both been outrighted off the 40-man roster and are very likely to be bought out. If they’re added back to the 40-man, the Angels would control both players via arbitration even if they decline the options.

Seattle Mariners

  • Mitch Garver, DH ($12MM mutual option, $2MM buyout)

Garver’s two-year, $24MM contract remains the only multi-year deal that the Mariners have awarded to a free agent hitter under Jerry Dipoto’s leadership. It hasn’t gone well. While Garver’s injury history made that a somewhat risky investment, he looked like a good bet to hit whenever he was on the field. Garver was coming off a .270/.370/.500 showing for the Rangers during their World Series season, and he brought a career .252/.342/.483 batting line to T-Mobile Park.

The 34-year-old’s production tanked almost immediately. He managed a career-high 430 plate appearances last season, but it came with easily his worst rate stats in a full season. Garver hit .172/.286/.341 while striking out at a 31% rate. It wasn’t simply a product of Seattle’s pitcher-friendly park. His .186/.290/.324 line on the road wasn’t any better than his .153/.281/.363 showing at home. He doesn’t look to be on the verge of a rebound. Garver has begun this season with four singles, six walks, and zero extra-base hits across 34 trips to the plate.

  • Andrés Muñoz, RHP ($6MM club option)

The Mariners worked out an extension with the hard-throwing Muñoz during the 2021-22 offseason. He’d made all of one appearance in a Seattle uniform at the time. Muñoz had undergone Tommy John surgery while a member of the Padres in 2020. Seattle acquired him early in the rehab process. They believed he’d blossom into a late-game weapon. They were right.

Muñoz has rattled off three straight sub-3.00 ERA seasons since signing his extension. He has begun this year with 10 scoreless innings, recording 13 strikeouts with an AL-leading seven saves. He carries a 2.35 earned run average with a huge 34.7% strikeout rate over 184 frames in a Seattle uniform. This has quickly become one of the most team-friendly contracts in the game.

The option is essentially a lock unless he suffers a significant injury that’d cost him all of next season. The team has respective $8MM and $10MM options for 2027 and ’28, so they could keep him at below-market rates for three years. Next season’s option has a $6MM base value. It’d climb by $250K apiece if Muñoz finishes 20, 30, 40 and 45 games this year. He’s already at eight games finished and should get to 45 by season’s end. The option price will probably end up at $7MM, but it’s an easy call for the front office.

  • Jorge Polanco, 3B ($8MM mutual option, $750K buyout)

Polanco’s option begins as an $8MM mutual provision, but he can convert it to a player option if he hits a vesting threshold. If he reaches 450 plate appearances this season and avoids a lower half injury that’d require him to begin next season on the injured list — which is protection for the team given his recent knee concerns — it’d become a $6MM player option. Getting to 550 plate appearances this year would push the player option price to $8MM.

If Polanco does not hit the vesting threshold, it’d remain an $8MM mutual option with a $750K buyout. He has been dinged up by knee and side discomfort that has limited him but not prevented him from playing. The switch-hitting Polanco is currently unable to play the infield or hit right-handed in games. He’s a lefty-swinging designated hitter for now. Yet he’s been on such a tear that the Mariners will happily live with the limitations.

Polanco has connected on three homers and a pair of doubles through 13 games. He’s hitting .378. That not only leads the team but ranks sixth in the majors among hitters with at least 40 plate appearances. He’s obviously not going to keep up this pace, but Polanco was fairly consistently an above-average hitter during his run as Minnesota’s second baseman. The Mariners felt that last year’s career-worst production was attributable to the knee injury through which he played a good chunk of the season. Polanco has done his best to prove that right so far.

Texas Rangers

  • None
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Los Angeles Angels MLBTR Originals Seattle Mariners Andres Munoz Jorge Polanco Kevin Newman Mitch Garver

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Mariners Select Casey Lawrence

By Steve Adams | April 18, 2025 at 1:42pm CDT

The Mariners announced Friday that they’ve selected the contract of right-hander Casey Lawrence from Triple-A Tacoma. He’d cleared waivers after being designated for assignment a week ago, briefly elected free agency, and returned on another minor league deal. He’s now right back in the big leagues. Righty Troy Taylor was optioned to Tacoma in his place.

This marks the latest stop in a frequent matchup between Lawrence and the Mariners. Seattle originally claimed the righty off waivers back in 2017, and while he’s bounced around the league at times, he’s repeatedly made his way back to the M’s, signing a quartet of minor league deals and pitching for them in parts of three different seasons. Lawrence also spent the entire 2024 campaign in the Mariners organization, though he wasn’t brought up from Triple-A Tacoma at any point last season.

In 127 major league innings between the Blue Jays, Mariners and Cardinals, Lawrence has pitched to a 6.73 ERA with a 16.6% strikeout rate and an 8.5% walk rate. He’s also pitched in parts of 10 Triple-A seasons, working to a 4.32 ERA in 733 frames at the top minor league level.

It could very well be another short stint for Lawrence, who seems amenable to serving as a depth arm with the Mariners and riding the DFA carousel for the time being. He’ll give Seattle a fresh arm after a wild, back-and-forth extra-innings game saw the Mariners burn through seven relievers en route to a victory over the Reds yesterday. Each of Andres Munoz, Trent Thornton, Gabe Speier and Carlos Vargas has now pitched on back-to-back days, so Lawrence has a good chance at getting into tonight’s series opener in Toronto.

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Seattle Mariners Transactions Casey Lawrence

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Mariners, Zach Pop Agree To Minor League Deal

By Steve Adams | April 18, 2025 at 9:42am CDT

The Mariners and right-hander Zach Pop have agreed to a minor league contract, per the transaction log at MiLB.com. The Blue Jays designated Pop for assignment at the end of spring training when they needed a 40-man roster spot. The out-of-options righty was battling elbow inflammation at the time, and since injured players can’t be placed on outright waivers, the Jays instead had to place him on release waivers. He became a free agent a couple weeks ago and will now join the fifth organization of his professional career.

Pop, 28, was a seventh-round pick by the Dodgers back in 2017. Los Angeles traded him and four others to the Orioles in the 2018 Manny Machado blockbuster, and he’s since pitched with the Marlins and Blue Jays organizations. The 6’4″ righty has logged big league time in each of the past four seasons, working to a combined 4.45 ERA with a sub-par 18.4% strikeout rate, a solid 7.9% walk rate and an excellent 55% ground-ball rate.

The 2024 season was a struggle for Pop, who pitched to a grisly 5.59 ERA over the course of 48 1/3 innings. With his sinker being hit harder than usual in 2023-24, Pop began to incorporate a cutter a couple months into the season. The pitch showed some promise, generating plenty of pop-ups and whiffs when chased off the plate, but Pop also misfired with it too often and served up three of his nine homers on the new offering — despite only throwing it at a 12.3% clip.

If the Mariners can help Pop refine that cutter or perhaps implement a new third offering, he could yet emerge as a reliable bullpen arm. He sits 96 mph with his sinker, which is plenty in terms of velocity, and his slider has long graded as a quality offering. The pitch misses bats, and opponents have slugged only .328 against it when making contact. Add in his lofty ground-ball numbers and it’s easy enough to see why the Mariners feel they may be able to coax another level out of him, even if the results over the past couple seasons have been rough.

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Seattle Mariners Transactions Zach Pop

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Mariners Option Gregory Santos

By Steve Adams | April 16, 2025 at 5:00pm CDT

The Mariners have optioned right-hander Gregory Santos to Triple-A Tacoma and recalled fellow right-handed reliever Will Klein in his place, per a team announcement.

It’s the first time in nearly three years that Santos has been optioned to the minors. He was a notable trade acquisition in the 2023-24 offseason, with the Mariners sending prospects Prelander Berroa, Zach DeLoach and a Competitive Balance (Round B) draft selection to the White Sox in return.

At the time of the swap, Santos was fresh off an excellent breakout season in Chicago and had five years of club control remaining. His 2023 campaign with the South Siders featured 66 1/3 innings of 3.39 ERA ball. Santos had averaged 98.9 mph on his sinker while turning in strikeout, walk and ground-ball rates of 22.8%, 5.9% and 52.5%, respectively. He’d started that season in a low-leverage role but found himself pitching more meaningful innings as the year went on; he finished with five saves and six holds. It looked like the start of a lengthy run as a quality high-leverage reliever.

As we see all too often with pitchers, however, injuries intervened. Santos was diagnosed with a lat strain last spring and spent the first three-plus months of the season on the injured list as a result. He returned in early July but was back on the 15-day IL less than a month later, this time owing to biceps inflammation. He returned in the season’s final week and pitched a pair of scoreless innings.

Heading into 2025, Santos looked to be on track for a rebound. The lat strain was behind him, he’d finished the prior season healthy, and he posted a 1.59 ERA in six spring appearances (one run in 5 2/3 innings). That hasn’t played out whatsoever.

Santos’ once premium command has been nowhere to be found. He’s pitched seven innings and faced 36 batters. Eight of them have reached via base on balls (albeit, two of them being intentional). He’s also tossed a pair of wild pitches. Equally or more concerning is the fact that he hasn’t recorded a single strikeout yet. He’s still getting heaps of ground-balls (63%), but he’s missing badly and not inducing chases off the plate. His 11.5% opponents’ chase rate is the fourth-worst among all pitchers with at least five innings this year. His 4.6% swinging-strike rate is tied for ninth-worst.

There hasn’t been a major drop-off in Santos’ velocity. His sinker is down a bit, sitting at 98 mph, but that’s less than a one-mile gap from his 2023 peak. He’s had a bit more of a pronounced drop in his slider velo, but there’s no reason to believe he’s injured at the moment. (He is, after all, being optioned and not placed on the 15-day IL.) Santos has seen some changes in his release point from 2023 to 2025, but again, it’s not necessarily a drastic difference. For now, he’ll head to Triple-A Tacoma for a reset and look to get back on track.

It’s possible, though not yet certain, that today’s demotion could alter Santos’ path to arbitration and to free agency. He entered the season with two years and 55 days (2.055) of big league service, meaning he needed 117 days on the roster to reach three years and keep pace for arbitration eligibility this winter and free agency following the 2028 season. Of course, those factors will be rendered moot if he can’t get back on track and reestablish himself as a credible big league reliever.

Klein has actually had similar struggles to those of Santos down in Tacoma this year. He’s faced 36 batters and walked seven of them while plunking another and being charged with four wild pitches. He’s at least missing bats however and is doing so at an eye-popping rate; Klein has fanned 36.1% of his opponents and is sitting on a strong 13.8% swinging-strike rate. He’ll give Seattle a fresh arm one day after four relievers (Santos among them) needed to cover 3 2/3 innings following a rough start from Luis Castillo.

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Seattle Mariners Gregory Santos Will Klein

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