- The Mariners’ offense has been one of the best in baseball since Edgar Martinez assumed hitting coach duties on August 23, yet it isn’t clear if Martinez will be back in the job next season. The Seattle Times’ Adam Jude writes that the club has already started looking for a new hitting coach, though the M’s would seemingly love having Martinez return, if he is willing to take on the daily grind of a coaching role over a full season. The possibility exists that the Mariners could both hire a new top hitting coach and still retain Martinez, as Jude suggests that Martinez could stay on as a coach for just home games, in order to cut down on the travel.
Mariners Rumors
Gregory Santos Possibly Nearing Return To Mariners
- Gregory Santos could be activated off the Mariners’ 15-day injured list within the next couple of days, the Seattle Times’ Adam Jude reports (via X). Between a season-opening lat strain and then a bout of biceps inflammation that has kept him sidelined since July 31, Santos has appeared in only six games for Seattle this year, delivering a 6.75 ERA in 5 1/3 innings of work. Santos has also tossed 5 1/3 innings during his six Triple-A rehab outings, with a 1.69 ERA but also with more walks (seven) than strikeouts (six). Acquired from the White Sox in a notable February trade, Santos hasn’t done much in his first season with the Mariners, but there’s a chance for some late heroics if he can return in time to help the M’s sneak into a playoff berth.
Mariners Outright Seby Zavala
The Mariners sent catcher Seby Zavala outright to Triple-A Tacoma. Seattle designated him for assignment on Friday when they promoted Emerson Hancock to take Luis Castillo’s spot in the rotation.
That was a predictable transaction. The M’s had only promoted Zavala a few days earlier when Castillo hit the injured list. Seattle didn’t need a fifth starter for a few days between Castillo’s IL placement and the Hancock recall. They briefly added to their depth behind the plate by calling Zavala to serve as the #3 catcher behind Cal Raleigh and Mitch Garver. Zavala didn’t get into a game before being DFA for the third time of the season.
Zavala was presumably aware that this stay on the roster could be brief. He at least picked up a few days of major league pay. Acquired from Arizona in the Eugenio Suárez deal, Zavala has hit .154 in 18 games for Seattle this season. He’s hitting .188/.325/.376 across 33 contests with Tacoma. The 31-year-old defensive specialist has a .205/.268/.345 slash over parts of five seasons in the majors.
As was the case when Zavala cleared waivers for the first two times this season, he has the right to elect free agency. It’s likelier he’ll accept the assignment and stick around as injury insurance for Raleigh and Garver. Zavala would become a minor league free agent at the start of the offseason unless the M’s call him back up.
Nori Aoki To Retire At NPB Season’s End
Former big league outfielder and current member of Nippon Professional Baseball’s Yakult Swallows Nori Aoki is set to retire following the 2024 campaign, per an announcement from the Swallows yesterday (hat tip to The Yomiuri Shimbun). Aoki, 42, spent parts of six seasons in the majors in addition to a lengthy career in Japan.
Aoki’s career first began with the Swallows back in 2004 when he debuted at the age of 22. He made it into just ten games with Yakult that year, going 3-for-15 at the plate with a walk, a stolen base, and six strikeouts. That tiny sample size did nothing to suggest what Aoki would go on to do in his first full season with the club, however, as he slashed an excellent .344/.387/.417 in 144 games during the 2005 season, becoming just the second player in NPB history (after Ichiro Suzuki) to collect 200 hits in a single season.
He improved to even greater heights throughout his mid-20s, slashing 15-to-20 homer power to go along with fantastic contact and baserunning skills. As his plate discpline developed, he even began to walk more than he struck out, leading to a dominant stretch of seasons from 2007 to 2010 where he walked at a 10.6% clip against a minuscule 9.8% strikeout rate in addition to his aforementioned solid power and impressive base-stealing abilities, and even crossed the 200-hit barrier for a second time in 2010 to become the only NPB player in history to achieve the feat twice.
Given the excellence he had demonstrated throughout his time with the Swallows, it was hardly a surprise when he was quickly snapped up by the Brewers on a two-year deal after being posted for major league clubs prior to the 2012 season. In Milwaukee, Aoki was a slightly above average hitter with a solid .287/.355/.399 slash line. While he only hit a combined 18 home runs over his two seasons with the Brewers, he swiped 50 bags while hitting 57 doubles and 7 triples in that same period. That was a strong enough performance for Milwaukee brass to pick up Aoki’s club option for the 2014 season, but he did not last the offseason with the club and was swapped to the Royals in a deal that brought lefty Will Smith to the Brewers.
After departing the Brewers, Aoki wouldn’t stick around with an MLB club for more than a season at the time for the rest of his time in stateside ball. After acting as the regular right fielder in Kansas City for the club’s AL pennant-winning 2014 season, Aoki departed in free agency to sign with the Giants but was limited to just 93 games when he suffered a broken leg and a concussion in two separate hit-by-pitch incidents. Aoki then signed a one-year deal with the Mariners in 2016 but began to show some signs of decline, notably stealing only seven bases in sixteen attempts with the worst strikeout and walk numbers of his MLB career, though he did display his best power numbers since his rookie 2012 campaign with the Brewers.
Aoki’s final season in the big leagues came back in 2017 and saw him change uniforms several times. The veteran outfielder was claimed off waivers from the Mariners by the Astros during the 2016-17 offseason. Aoki struggled somewhat through 70 games with Houston, however, and ended up traded to the Blue Jays at the deadline that year alongside Teoscar Hernandez in a deal that brought Francisco Liriano to Houston. Aoki managed to catch fire down the stretch, however, and while his playing time was further split between the Blue Jays and Mets over the final two months of the season he slashed .281/.294/.594 for Toronto in August before slashing .284/.371/.373 in Queens that September.
Following the end of his MLB career, Aoki returned home to the Swallows and has played for the club in each of the past seven seasons. Now 42, the veteran is the league’s oldest active player and has collected more than 7,000 plate appearances with a .313/.392/.445 slash line in 1,713 NPB games. Between NPB and MLB play, Aoki has stepped up to the plate more than 10,000 times with 2,765 hits, 470 doubles, 51 triples, 179 homers and 279 stolen bases. We at MLBTR congratulate Aoki on a fine career and wish him all the best in his post-playing pursuits.
Mariners Recall Emerson Hancock, DFA Seby Zavala
The Mariners have promoted right-handed pitcher Emerson Hancock from Triple-A, the team announced this afternoon. To make room on the active roster, Seattle designated catcher Seby Zavala for assignment.
Hancock will take the ball this evening against the Rangers, filling in for an injured Luis Castillo. Castillo landed on the 15-day IL with a Grade 2 left hamstring strain following his start last Sunday. After officially placing Castillo on the IL on Tuesday, the Mariners did not need to add another starting pitcher to the active roster until today, so they selected Zavala’s contract instead. He did not appear in a game. Presuming Zavala passes through waivers, he will most likely accept an outright assignment to Triple-A Tacoma, considering the Mariners have already outrighted him twice this season. Indeed, this is the second time Seattle has DFA’d Zavala to make room for Hancock on the major league roster.
The 25-year-old Hancock is back for his fourth stint with the big league club this season. Over nine starts, he has pitched to a disappointing 4.76 ERA and 5.14 SIERA in 45 1/3 innings pitched. Unfortunately, the young right-hander hasn’t looked much better at Triple-A. He has a 4.66 ERA and 5.78 FIP in 10 starts (56 IP) since his most recent demotion. As was his biggest problem last year, he has had tremendous difficulty earning strikeouts against Triple-A and MLB competition, and he isn’t limiting walks or hard contact as much as needs to if he’s going to survive with such a low strikeout rate.
Hancock still has all the potential that made him one of the Mariners’ top pitching prospects from the moment he was selected with the sixth overall pick in 2020 to his graduation from prospect status this season. However, he has yet to turn that potential into results. Presumably, he’ll get a couple more chances to prove himself in the majors this season while Castillo is on the IL.
Zavala, 31, came to the Mariners last November as part of the trade that sent Eugenio Suárez to the Diamondbacks. He is a strong defensive catcher thanks to above-average framing and blocking skills, but his career .205/.271/.342 slash line is precisely why he has been unable to hold down a job in the majors this season. It hasn’t helped that he is 19-for-101 (.188) with a 79 wRC+ at Triple-A this year. Presumably, he will finish the season at Triple-A Tacoma, sticking around as additional catching depth in case one of Cal Raleigh or Mitch Garver suffers a late-season injury.
James Paxton Planning To Retire
Red Sox left-hander James Paxton plans to retire after this season, he tells Rob Bradford of WEEI. The 11-year big league veteran announced the news on Bradford’s Baseball Isn’t Boring podcast (X link).
“I’m hoping that we can squeak into the postseason and I get an opportunity to pitch again. But I think, after this season, I’m going to be retiring and moving on to the next chapter,” Paxton said. The 35-year-old called it a “tough” decision because he remains confident in his ability but indicated he feels it’s the right time to “settle in at home.” Paxton told Bradford he has already gotten to work on building a company focused on addressing athletes’ mental health.
While there’s a small chance he gets back on the mound this year, it’s likely his playing career is over. Paxton tore his right calf in mid-August and was placed on the 60-day injured list last month. He’s ineligible to return until the middle of October. The Sox would need to erase a four-game deficit in the Wild Card race and likely need to make a run into at least the ALCS for Paxton to be able to get on the mound.
Injuries were an unfortunately frequent occurrence. This season was only the fifth in which he reached 100 MLB innings. Paxton was a very productive pitcher when healthy, highlighted by a four-year peak with the Mariners and Yankees at the end of the 2010s.
The Blue Jays initially drafted Paxton, a British Columbia native who’d eventually earn the “Big Maple” nickname. Toronto selected him 37th overall in the 2009 draft. The sides couldn’t agree to contract terms, however, sending the 6’4″ southpaw back to the draft the following year. Seattle selected him in the fourth round, a move that would pay off a few seasons later.
Paxton was immediately one of the M’s top pitching prospects. He got to the big leagues as a September call-up in 2013, firing 24 innings of 1.50 ERA ball. Paxton battled shoulder and finger injuries, respectively, over the following two seasons. He was limited to 13 starts in each year but managed a sub-4.00 earned run average both times. Paxton topped 100 innings and reached 20 appearances for the first time in 2016, turning in a 3.79 ERA with nearly a strikeout per inning.
The following season saw Paxton emerge as an upper mid-rotation starter, at least on a rate basis. He fired 136 frames with a career-best 2.98 ERA while striking out more than 28% of opponents. Paxton continued to miss bats in bunches the following year, when he fanned 32.2% of batters faced with a 3.76 ERA across 160 1/3 innings. Among pitchers with 150+ innings, only Chris Sale, Justin Verlander, Max Scherzer and Gerrit Cole had a better strikeout rate that year.
That 2018 campaign saw Paxton log the highest workload of his career and included perhaps his two best performances. Paxton no-hit the Jays at the Rogers Centre in May 2018, becoming the second Canadian pitcher in MLB history to throw a no-hitter. That was one of two complete game victories he posted that month, though those arguably weren’t even his best outings. Paxton also struck out a personal-high 16 A’s hitters over seven scoreless innings in the start preceding his no-hitter. Overall, he struck out 51 hitters with a 1.67 ERA across 43 innings that month.
At the end of that season, the M’s traded Paxton’s final two seasons of arbitration eligibility to the Yankees for a three-player return. The headliner, Justus Sheffield, did not pan out. Erik Swanson, included as the secondary piece, developed into a productive reliever. Paxton had a strong first season in the Bronx, tossing 150 2/3 frames of 3.82 ERA ball while punching out nearly 30% of opposing hitters. He started a trio of postseason games for a Yankee team that lost to the Astros in the ALCS. Barring a surprise run from this year’s Sox, those were the only playoff appearances of his career. Paxton fanned 20 while allowing five runs in 13 innings (3.46 ERA).
That was Paxton’s final full season. He sustained a flexor strain during the shortened 2020 season, limiting him to five starts in his walk year. The Mariners brought him back during his first free agent trip on a buy-low $8.5MM deal. Paxton pitched once before his elbow blew out. He underwent Tommy John surgery and wouldn’t pitch again until 2023.
Paxton made 19 starts and logged 96 innings for the Red Sox last season, the second year of a $10MM free agent deal. He returned to the open market and signed with the Dodgers on a contract that eventually paid him $13MM after he hit certain start bonuses. L.A. squeezed him off the roster just before the trade deadline and flipped him back to Boston. Paxton made three starts for the Sox before suffering the calf injury. He’ll finish the year with a 4.40 ERA across 100 1/3 innings between the two clubs.
While the injuries kept Paxton a bit below 1000 innings, he finishes his career with a solid 3.77 earned run average. Paxton recorded his 1000th strikeout against former teammate Justin Turner on July 30. He made 177 appearances, all starts, and compiled a 73-41 record with a pair of complete games. Paxton’s one shutout was a memorable one — the aforementioned no-hitter in his home country. Baseball Reference credits him with roughly 14 wins above replacement, while he was worth 19 WAR at FanGraphs. B-Ref calculates his earnings at nearly $50MM. MLBTR congratulates Paxton on a fine career and sends our best wishes on his worthwhile endeavor to help athletes with their mental health.
Image courtesy of USA Today Sports.
Mariners Outright Jason Vosler
Mariners infielder Jason Vosler went unclaimed on outright waivers and has been assigned to Triple-A Tacoma, the team announced Wednesday. He has the ability to reject the assignment in favor of free agency, although he can also become a minor league free agent at season’s end even if he accepts for now.
Vosler, 31, only appeared in 10 games with the M’s and tallied 30 plate appearances, batting .179/.233/.286 with a double and a triple in that cup of coffee. It’s the fourth big league season in which the former Cubs draftee (2014, 16th round) has appeared in the majors. Vosler has also played for the Giants and Reds, combining for 288 big league plate appearances with a .207/.274/.395 slash, 10 homers, 13 doubles and three triples.
Modest big league track record aside, Vosler has regularly been a productive Triple-A hand, including this year with the Mariners’ top affiliate in Tacoma, where he batted .299/.368/.566 with 28 big flies in just 485 turns at the plate. It’s the sixth partial season Vosler has spent in Triple-A, and he’s a lifetime .273/.347/.503 hitter in that time. He’s primarily been a third baseman, with more than 5000 professional innings at the position, but he’s also topped 2000 innings at first base and has a couple hundred innings of corner outfield work under his belt as well.
Whether it happens now or at the end of the season, Vosler figures to become a minor league free agent and look to latch on with another club seeking a lefty-swinging corner option with some pop in his bat. Given his track record in the upper minors, he should land another minor league deal this offseason.
Mariners Place Luis Castillo On Injured List
The Mariners placed Luis Castillo on the 15-day injured list, retroactive to September 9, with a left hamstring strain. GM Justin Hollander told reporters this evening that the strain is of a Grade 2 variety. Seattle also transferred reliever Yimi García from the 15-day to the 60-day injured list, ending his season. Catcher Seby Zavala was selected onto the 40-man roster.
Castillo exited his start against the Cardinals on Sunday after three innings because of the injury. He went for imaging yesterday. That revealed the strain, which is evidently of moderate severity. Ryan Divish of the Seattle Times tweets that Castillo received a platelet-rich plasma injection and is hopeful of returning when first eligible.
That may well be determined as much by how the team plays over the next two weeks as by Castillo’s recovery. The M’s are holding onto faint playoff hopes. They’re tied with the Tigers and Red Sox at three games back of the Twins for the American League’s last Wild Card spot. Seattle is 4.5 games behind the Astros in the AL West.
Castillo would first be eligible to return on September 24. There’d be five games left in the regular season — two at Houston and a three-game set at home against the A’s. Seattle would surely need to make up ground on either the Twins or Astros before then to have any hope of a playoff berth. If they don’t do so, there’d be little reason to get Castillo back before the end of the year.
It’s the first injured list stint in two years for the three-time All-Star. Castillo hadn’t missed a start since the M’s acquired him at the 2022 deadline. He pitched 11 times down the stretch that year and made 33 appearances last season. Castillo is tied for the MLB lead with 30 starts this year. He owns a 3.64 ERA with a 24.3% strikeout rate across 175 1/3 innings. While this has been a slight step down from last season — when he finished fifth in Cy Young balloting — Castillo remains one of the more valuable starters in the game. Emerson Hancock will probably take his rotation spot alongside George Kirby, Logan Gilbert, Bryan Woo and Bryce Miller.
Seattle also loses one of their top relievers for the year. García has been shut down from throwing after experiencing elbow soreness during a recent bullpen session, the team announced (relayed on X by Daniel Kramer of MLB.com). The right-hander has been on the IL since August 24 due to elbow inflammation. García, an impending free agent, has been on the IL twice this year with elbow problems.
García had pitched very well for the Blue Jays earlier in the season. He turned in a 2.70 ERA with a 36.5% strikeout rate across 30 innings before the M’s acquired him in a deal sending rookie outfielder Jonatan Clase to Toronto. That didn’t pan out for the Mariners. García managed only nine innings in a Seattle uniform and allowed six runs. There’s no indication he’ll need any kind of surgery, but a forearm injury is a frustrating end to what had been shaping up as a strong walk year for the veteran righty.
Zavala returns to the MLB roster for his third stint of the season. The out-of-options catcher has hit .154/.214/.282 in 18 games. He’s hitting .188/.325/.376 across 33 appearances with Triple-A Tacoma. Zavala can work as a third catcher behind Cal Raleigh and Mitch Garver for the time being. It may be a short stay on the roster, though, as Seattle could jettison a position player to add a 14th pitcher to the active roster once they need a fifth starter this weekend.
Mariners Claim Austin Kitchen, DFA Jason Vosler
The Mariners have claimed left-hander Austin Kitchen off waivers from the Marlins, per a team announcement out of Miami. In a corresponding move, Seattle has designated first baseman Jason Vosler for assignment.
Kitchen, 27, was designated for assignment over the weekend after a brief, but meaningful, stint with the Marlins. The club claimed him off waivers from the Rockies in June, and he made his MLB debut at the end of July. Unfortunately, his first few tastes of big league action in Miami weren’t particularly successful; he gave up 12 runs (11 earned) over seven innings before his DFA. On the bright side, he has a 2.96 ERA and 3.74 FIP across 48 2/3 minor league innings this season split between the Rockies and Marlins organizations.
The left-hander will now report to the Triple-A Tacoma Rainiers. He will not be eligible to pitch for Seattle in the postseason, but he offers a bit of additional depth down the stretch. What’s more, he still has two option years remaining, so if the Mariners like what they see from Kitchen, they could easily choose to keep him around in 2025.
Vosler, 31, played 10 games with the Mariners this season during a brief call-up between mid-July and early August. He went 5-for-28 with a .519 OPS. However, he has looked much better at Triple-A, batting .299 with 28 home runs and a .934 OPS in 111 games. Despite his minor league success, he did not have a path to meaningful playing time in Seattle, so it’s not too surprising to see him cut from the 40-man roster. It’s likely he clears waivers, after which he will presumably elect free agency, either right away or at the end of the season. Vosler has played for five different organizations, including three at the MLB level, over a professional career that has spanned more than ten years.
Luis Castillo To Undergo MRI For Hamstring Strain
Mariners right-hander Luis Castillo left Sunday’s game due to a strain in his left hamstring, and will undergo an MRI on Monday to assess the damage. Castillo told reporters (including Adam Jude of the Seattle Times) via interpreter that some discomfort first arose in the fourth inning when he moved on the mound to evade a throw that never came from catcher Mitch Garver on an Ivan Herrera stolen base. Two pitches after Herrera’s steal, Castillo grimaced on the mound after his follow-through, and left the game after a visit from trainers.
“The discomfort’s there. Tomorrow we’re going to get some [tests] done, just to see what it is, but hopefully it’s not too bad,” Castillo said.
With the Mariners battling for either the AL West title or a wild card, losing Castillo would put a serious dent in the club’s playoff hopes. Seattle ranks at or near the bottom of the league in several major offensive categories, yet the M’s have been carried by their elite rotation. The rotation has been both effective and durable — of the 21 starters who have tossed at least 161 1/3 MLB innings this season, four of them (Castillo, Logan Gilbert, George Kirby, and Bryce Miller) pitch for Seattle.
Bryan Woo has had a pair of IL stints, with Emerson Hancock stepping into the rotation in Woo’s place to take nine starts. Hancock (currently at Triple-A) is the likeliest candidate to return to the staff if Castillo has to go on the injured list, yet the former top prospect hasn’t been very consistent against big league hitters. Hancock has a 4.76 ERA in 45 1/3 innings and a 4.50 ERA in 12 innings in his 2023 debut season, and only a 13.8% strikeout rate in his brief MLB career.
While Hancock is a better sixth starter than most clubs possess, there’s still no easy way to replace Castillo. The three-time All-Star hasn’t been quite as effective as he was when finishing fifth in AL Cy Young Award voting in 2023, but Castillo still has a 3.64 ERA over 175 1/3 innings this year. His strikeout and walk rates are still above the league average, and while Castillo’s four-seamer has dropped in velocity from 96.3mph in 2023 to 95.5mph this season, it remains one of the most effective pitches in baseball.
