KBO’s Kia Tigers To Sign Adam Oller
Right-hander Adam Oller has agreed to terms with the Kia Tigers of the Korea Baseball Organization, reports Ari Alexander of Houston’s KPRC-2. It’ll be the Gaeta Sports Management client’s first stint overseas, and he’ll join the reigning KBO champs.
Oller, 30, has pitched in each of the past three big league seasons. Originally a 2016 draftee of the Pirates, he wound up out of affiliated ball by 2019 but parlayed stints in the independent Frontier League (2019) and in the Australian Baseball League (2020-21) into a minor league opportunity with the Mets. He made the most of that, pitching his way into prospect status with an outstanding age-26 season split between Double-A and Triple-A. The A’s were intrigued enough to acquire Oller and fellow righty J.T. Ginn as their return from the Mets in the trade sending Chris Bassitt to Queens.
Things didn’t work out for Oller in Oakland, however. He was in the majors early during his first season with the organization but hit hard in both 2022 and 2023, yielding a combined 7.09 ERA in 94 frames. The A’s tried to pass him through waivers in July of ’23, but the Mariners claimed him and optioned him to Triple-A Tacoma. He’d spend the remainder of the season with Seattle’s top affiliate, eventually clearing waivers and electing free agency after being dropped from the roster in October.
Oller caught on with the Guardians and Marlins on minor league deals in the year that followed, the latter of whom selected him to the majors this past July. He pitched another 42 1/3 MLB frames across eight starts but was tagged for a 5.31 ERA. Oller did have a handful of nice outings in Miami, but it was an up-and-down tenure with more lows than highs. He was passed through waivers again at the beginning of this month, elected free agency and will quickly find a new opportunity overseas.
Despite his lack of MLB success, there’s reason to think Oller could fare well in the KBO. He posted sharp numbers in Triple-A in 2021-22, struggled through a disastrous season with the Athletics’ Triple-A Vegas club in 2023, and then again pitched to a 2.88 ERA with the Marlins’ top affiliate this past season. His 6.22 Triple-A ERA in 2023 skews his career-long mark to 5.01, but he’s typically been a solid arm at the top minor league level. Oller averages 93.7 mph on his four-seamer, complementing the pitch with a curveball and lesser-used changeup.
It’s at least feasible that Oller could spin one strong KBO season into a big league return, though success overseas can also open further opportunities in Asia. It’s common for players who thrive in the KBO to re-sign for a pay raise in their second season or perhaps to draw interest from teams in Japan’s Nippon Professional Baseball. However it plays out, the earning power for Oller overseas is surely greater than it would be on a minor league deal in North America, and for a pitcher who’s already turned 30 and is still not into arbitration, that’s a compelling selling point.
Mariners Prioritizing Infield Bats
The Mariners are once again looking to upgrade their offense this winter after 2024’s underwhelming results at the plate squandered a terrific season from their pitching staff. Unsurprisingly, general manager Justin Hollander tells Jon Morosi of MLB.com that the M’s view second base as a priority this offseason. Ken Rosenthal of The Athletic adds that the M’s would also like to add at first base. Ideally, Seattle would add one bat to help out at second or third base — with Josh Rojas and Dylan Moore a potential platoon at the other spot — and another at first base. Hollander downplayed the idea of adding to the outfield, telling FanSided’s Robert Murray that between Randy Arozarena in left, Julio Rodriguez in center, Victor Robles in right and Luke Raley as a corner outfield/first base/DH option, the Mariners feel they have potential for a “pretty high-end outfield.”
With the offseason just days old, there are of course virtually limitless options to explore via free agency and trade. Morosi reports that Seattle is among the teams to have evaluated Hyeseong Kim, the star second baseman of the Korea Baseball Organization’s Kiwoom Heroes. Kim, 25, is scheduled to be posted for MLB clubs to bid on this winter. Rosenthal lists a reunion with Justin Turner as something Seattle could pursue. He cautions against the likelihood of the Mariners spending to the levels necessary to add longtime division rival Alex Bregman or (to a lesser extent) first baseman Christian Walker.
Kim, 26 in January, hit .326/.383/.458 with 11 home runs, 30 steals, an 8.3% walk rate and just a 10.9% strikeout rate for the Heroes this past season. He’s been a plus hitter three straight seasons in the KBO but is more of a contact-, speed- and defense-oriented player, as he’s not considered to have much home run pop. This past season’s 11 round-trippers were a career-high. Turner, of course, finished out the 2024 season in Seattle after coming over from the Blue Jays in a trade. He batted .264/.363/.403 in 190 plate appearances as a Mariner. His overall .259/.354/.383 slash is a ways from peak levels, and Turner will turn 40 later this month. That said, he was still a productive big league hitter this past season.
The Mariners’ expected focus on infield bats — and their flexibility to look at multiple positions — was laid out in our Mariners Offseason Outlook. As noted in that piece a few weeks back, Kim and Gleyber Torres are two particularly interesting options at second base, and both are likely to be relatively affordable. Former Padres shortstop Ha-Seong Kim could technically be a fit at second or third base, but he’s likely to miss the beginning of the season following his recent shoulder surgery and derives a good bit of his value from his plus glovework. He’d be a less-than-ideal fit if the goal is to bolster the offense from day one.
Meanwhile, signing Bregman or Willy Adames (perhaps with eye toward moving him to third base) would represent a major philosophical departure from the Mariners’ past mode of operation. The M’s have only given out one multi-year deal to a free agent position player under president of baseball operations Jerry Dipoto — that being last winter’s two-year, $24MM pact to Mitch Garver. Rosenthal suggests that signing a $100MM+ deal could be outside the team’s budget, but even beyond that, it’s simply not how Dipoto has historically operated.
The trade market could present various alternatives. The Rays will likely listen to offers on Yandy Diaz, making him one speculative fit at first base. He’d align well with Seattle’s desire to reduce their MLB-worst strikeout rate and is slated to earn $10MM next year with a $12MM club option for 2026. Rays second baseman Brandon Lowe, owed $10.5MM with an $11.5MM club option for 2026, is another on-paper fit. He wouldn’t reduce the team’s strikeout rate, but he’s a potential impact bat with multiple years of club control. Cleveland could listen to offers on slugging first baseman Josh Naylor.
However things play out, the M’s will be looking to once again redraw an offense that has struggled to make contact at one of the most glaring rates in the league. In addition to tying the Rockies with an MLB-high 26.8% strikeout rate, Mariners hitters had the league’s third-lowest overall contact rate (74%) and were tied for MLB’s second-worst contact rate on swings at pitches within the strike zone (82.9%). The Seattle lineup actually chased pitches off the plate at the fourth-lowest rate in MLB … but their contact rate on those swings was still the third-worst.
MLB Tenders Status Check On KBO Infielder Hyeseong Kim
The Korea Baseball Organization announced last night that MLB has tendered status checks on two players: second baseman Hyeseong Kim and first baseman/catcher Baek-Ho Kang (h/t to Dan Kurtz of MyKBO.net). That indicates both players are on the radar of at least one MLB team, though only Kim seems likely to make the jump this offseason.
A status check is the process used when an MLB team shows interest in a Korean player. MLB does not reveal the identity of the team or teams that requested the check. It is not an official opening of the posting process, which begins a 30-day window for a KBO player to negotiate with big league clubs.
The status check doesn’t mean that a player is going to come to MLB, though it’s a necessary first step for any player who eventually does so. Last offseason, status checks presaged postings and MLB deals for Jung Hoo Lee and Woo-Suk Go. MLB also conducted a status check on free agent reliever Deok Ju Ham, but he elected to re-sign with his KBO team a few weeks later.
Regarding Kim, the status check is a formality. The lefty-hitting infielder (not to be confused with MLB free agent Ha-Seong Kim) has prepared for a move to MLB since last winter. Kim has played parts of eight KBO seasons with the Nexen/Kiwoom Heroes. The Heroes announced in January that they would make him available to major league clubs during the 2024-25 offseason via the posting system. Kim hired CAA as his representation in June.
The 25-year-old hit .326/.383/.458 across 567 plate appearances this year. He’s a career .304/.364/.403 hitter. KBO pitching is much weaker than it is at the major league level. Scouting reports generally suggest Kim profiles as a utility player. MLB teams enamored with his glove could view him as a low-end regular at second base. He doesn’t have a ton of power upside, as this year’s 11 home runs represent a career high. Kim will very likely be posted later in the offseason. Last year, the Heroes waited until early December to post Lee. The LG Twins did the same with Go.
Kang, who plays for the KT Wiz, is reportedly not interested in pursuing an MLB opportunity at this time. Kurtz points to a Korean-language report from Sports Kyunghang in which team officials say that they confirmed with Kang that he intends to remain with the Wiz despite the status check. (The status check is only an indication that an MLB team is interested in the player, not the other way around.) Kang hit 26 home runs with a .289/.360/.480 batting line this season. FanGraphs wrote last offseason that Kang had plus power but projected as a first baseman with questions about his pure hitting ability as an MLB prospect.
Daniel Castano Announces Retirement
Left-handed pitcher Daniel Castano announced his retirement via a post on his personal Instagram account. “After 25 Baseball seasons, 9 years pro, 3 in college, 4 in HS, and 10 years of little league, I’m finally hanging up the cleats and for my more important career in life,” the post reads. “To be a loving Husband, father, friend, churchman and employee.” He goes on to thank the many people who helped him on his journey and mentions he will be pivoting to a role with Entrusted Contracting.
As Castano himself mentioned, his baseball journey had many stops. He pitched at Lake Travis High School in Austin, Texas, which then led him to Baylor University. He pitched three seasons for the Bears before the Cardinals selected him in the 19th round of the 2016 draft.
Just over a year later, Castano was flipped to the Marlins. Zac Gallen, Sandy Alcántara, Magneuris Sierra and Castano were sent to Miami in the December 2017 trade that sent Marcell Ozuna to St. Louis. Castano made it to the big leagues with the Fish in 2020, the first of four straight major league campaigns in which he appeared. He logged 88 2/3 frames over those four seasons, allowing 4.47 earned runs per nine. His 12.4% strikeout rate wasn’t especially strong but he limited walks to a 7.9% clip and kept 45.2% of balls in play on the ground.
The Marlins shuffled Castano on and off their roster in 2023 but he wasn’t holding a 40-man spot at the end of the season and became a free agent. In December, he landed a deal with the NC Dinos of the Korea Baseball Organization. He made 19 starts for the Dinos this year, posting a 4.35 ERA in 111 2/3 innings. At the end of July, the Dinos signed Eric Jokisch and bumped off Castano, as a KBO team can only have two non-Korean pitchers on its roster.
Now it seems Castano has decided it’s time to move on from baseball and move towards, as he puts it, his “more important career in life.” We at MLBTR salute him on carving out a big league career and we wish him the best for the upcoming chapters of his life.
Darin Ruf Joins University Of Nebraska Omaha Coaching Staff
Former big league first baseman/outfielder Darin Ruf has joined the University of Nebraska Omaha baseball program as an assistant coach, the school announced Wednesday. There’s been no formal announcement of retirement for the 38-year-old Ruf, but this certainly seems to indicate he’s turning the page on his playing days and moving onto the next phase of his baseball journey.
“We are thrilled to have Darin join our baseball family,” Mavericks head coach Evan Porter said in a statement within today’s announcement. “Darin’s incredible track record speaks for itself, but his character and work ethic are perhaps more impressive. I’ve been fortunate to know Darin for the past 20 years, his respect for the game and for the people around him is admirable. I couldn’t be more excited to work with Darin, he is a tremendous addition to our program.”
A 20th-round pick out of Omaha’s Creighton University back in 2009, Ruf reached the majors with the Phillies in 2012 and went on to enjoy a nine-year career in the major leagues in addition to an excellent three-year run with the Samsung Lions of the Korea Baseball Organization (2017-19).
Ruf’s debut campaign with the Phils was brief but showed clear potential for a meaningful big league career. He appeared in 12 games as a September call-up and popped three homers while batting .333/.351/.727 in 37 trips to the plate. The following season saw Ruf tally 293 plate appearances while hitting .247/.348/.458 with 14 round-trippers. He’d ultimately spend parts of five seasons with the Phillies, from 2012-16, batting a combined .240/.314/.433 while serving as a part-time first baseman and corner outfielder who could provide some right-handed thump off the bench.
From there, Ruf’s next stop was overseas. He not only found success with the KBO’s Lions — he took the entire league by storm. Ruf smacked 38 homers in his first Korean season and wound up posting a massive .313/.404/.564 batting line in 1756 plate appearances as a Lion. He belted 86 homers, 105 doubles and six triples during his run in the KBO, with overall offense about 45% better than league-average, by measure of wRC+.
Ruf returned stateside for the 2020 season, taking a minor league deal with the Giants that proved to be an outstanding deal for San Francisco. He cracked the Giants’ opening day roster in the shortened 2020 campaign, his age-33 season, and in 100 plate appearances turned in a .276/.370./517 slash that made him an easy call to keep for the Giants to tender him a contract in arbitration in the 2020-21 offseason. Ruf’s 2021 output was even better than that small-sample 2020 showing; in 312 plate appearances he hit .271/.385/.519 with 16 homers.
That sudden resurgence in the majors prompted the Giants to ink Ruf to a two-year, $6.25MM contract. His bat took a step back in the first season of the deal, but Ruf was still hitting at a slightly better-than-average level when the Mets acquired him at that summer’s trade deadline. His bat cratered following the move to Queens, however, and New York designated Ruf for assignment just before Opening Day 2023. He was released in early April, signed a minor league deal to return to the Giants, and split the 2023 season between San Francisco and Milwaukee, seeing brief playing time at both stops.
It now seems likely that’ll be the final stage of Ruf’s playing career. If he’s indeed shifting his focus to a coaching track, he’ll conclude his time in the majors with a career .239/.329/.427 batting line, 351 hits, 67 homers, 69 doubles, three triples, six steals, 198 runs scored and 205 runs driven in. Between MLB and the KBO, he cracked more than 150 homers and piled up more than 800 hits — all while earning more than $9MM in the majors and more than $4MM in South Korea.
The Omaha native will now help mold a younger generation of players while returning to his hometown. Ruf expressed excitement and gratitude in a statement of his own within today’s announcement:
“I am thrilled to be joining Evan’s staff in Omaha. I have been blessed with amazing coaches throughout my career and I am honored Evan has given me the opportunity to give back and work with these student athletes. I look forward to working with them on the field to become the best ball players they can be and off the field as they continue to develop into great people for the community of Omaha.”
KBO’s Kia Tigers Sign Eric Stout
The Kia Tigers of the Korea Baseball Organization announced this week that they’ve signed former MLB left-hander Eric Stout. He’s a temporary injury replacement for righty James Naile, who sustained a broken jaw when he was hit in the face by a comebacker off the bat of Matt Davidson (link via Jeeho Yoo of Yonhap News).
Stout, a 31-year-old southpaw, has 23 major league appearances under his belt. Three of them came with the Royals in 2018. The remainder were in ’22, when he combined for 20 outings between the Pirates and Cubs. Stout turned in a 5.64 ERA across 22 1/3 innings, striking out 22.7% of batters faced against an elevated 14.5% walk rate. He spent most of last year in Triple-A and signed in Taiwan’s Chinese Professional Baseball League for the ’24 season. Stout had a 2.77 ERA across 113 2/3 innings spanning 20 appearances to earn the bump to the KBO.
Naile, 31, appeared in 17 games for the Cardinals between 2022-23. While he struggled to a 7.40 earned run average, he parlayed a strong Triple-A season into a deal with the Kia Tigers. The UAB product had a 2.53 ERA with a decent 21.5% strikeout rate over 149 1/3 frames in his debut year in Korea. The jaw injury unfortunately ends his regular season, though Yoo suggests he could return in the playoffs.
KBO’s Samsung Lions Sign Lewin Diaz
The Samsung Lions of the Korea Baseball Organization announced this week that they’ve signed first baseman Lewin Díaz (relayed on X by Dan Kurtz of MyKBO). The CAA Sports client receives a $50K salary with up to $20K in incentives for the stretch run. The Lions also paid a $100K release fee to the Diablos Rojos del Mexico, the Mexican League team with which Díaz had been playing. Samsung waived outfielder Ruben Cardenas in a corresponding move.
Díaz, 27, was an MLBTR staple during the 2022-23 offseason. He changed teams via waivers or minor trade four times that winter. The Orioles eventually succeeded in sneaking him through waivers and kept him in Triple-A for all of last season. Díaz had a decent year in the minors, hitting .268/.362/.442, but never got an MLB look from Baltimore. He qualified for minor league free agency over the winter and signed a non-roster deal with the Nationals.
Washington released Díaz at the end of camp. He didn’t land another affiliated deal, instead making the move to Mexico. The left-handed hitter has mashed at a .376/.452/.647 clip with 19 homers across 75 games in that very hitter-friendly league.
Díaz was a fairly well-regarded prospect with the Twins early in his pro career. Minnesota dealt him to the Marlins as part of a deal for reliever Sergio Romo in 2019. Díaz didn’t hit major league pitching over parts of three seasons in Miami, running a .181/.227/.340 slash in 112 games. He has been an above-average Triple-A batter, posting a .258/.341/.479 mark in nearly 1200 plate appearances at the level.
Astros’ Eric Lauer Granted Release, Will Reportedly Pursue KBO Opportunity
The Astros released left-hander Eric Lauer, who’d been with their Triple-A club in Sugar Land, per the transaction log at MiLB.com. It seems that’ll pave the way for the former Brewers and Padres hurler to sign in the Korea Baseball Organization. Per KBO reporter Daniel Kim, Lauer will sign a deal with the Kia Tigers for the remainder of the 2024 campaign.
Lauer, 29, opened the season with the Pirates’ Triple-A affiliate after signing a minor league deal in spring training and joined Houston’s Triple-A club a couple months later after opting out of that deal with Pittsburgh. He’s had rough results on the whole in Triple-A this season, working to a combined 5.26 ERA between the two teams. However, he’s been on a good run as of late (2.86 ERA over his past five starts), has maintained respectable strikeout/walk rates throughout the ’24 season (25.3%, 9.1%), and of course has a big league track record of some note.
Selected by the Padres with the No. 25 overall pick in the 2016 draft, Lauer made his big league debut with San Diego in 2018 and spent two seasons pitching at the back of the Friars’ rotation. He logged a 4.40 ERA over 53 appearances (all but one of them as a starter) and looked well on his way to cementing himself as a serviceable back-end option. The Padres traded him to Milwaukee alongside Luis Urias in a trade shipping Trent Grisham and Zach Davies back to San Diego. Lauer made four ugly appearances during the pandemic-shortened 2020 season, yielding 16 runs in 11 innings, but bounced back in a major way the following year.
Early in the 2021 season, Lauer added a slider to his repertoire and saw his results take off. He posted a 3.19 ERA and fanned 24% of his opponents in 118 2/3 innings that year, including a minuscule 2.41 ERA after incorporating his new breaking ball. The strong results continued into 2022, and Lauer wound up pitching to a combined 3.47 ERA in 277 1/3 frames across the two seasons, fanning 23.8% of his opponents against an 8.7% walk rate.
Lauer’s 2022 season was slowed by a shoulder issue, however, and he battled shoulder and elbow troubles the following year as well. The lefty saw his average fastball plummet from 93.3 mph in 2022 to 91.2 mph in 2023. In 46 2/3 big league frames, he was tattooed for a 6.56 ERA as his K/BB rates both went in the wrong direction. The Brewers sent him to Triple-A Nashville to try to get him right, but Lauer’s struggles continued, as he was knocked around for a 5.15 ERA there and did not return to the big leagues.
Lauer clearly hasn’t recaptured his 2021-22 form in Triple-A this season, but he’ll aim to do so down the stretch in the KBO with a Kia club that’s currently sporting the league’s best record at 60-41. It’s feasible that a big showing overseas could lead to interest from MLB clubs this winter, but it could also open the door for Lauer to re-sign with the Tigers for the 2025 campaign. He’d pitch all of next season at 30 years of age, and if he can either rebound to 2021-22 form or reinvent himself with some new offerings (a la Erick Fedde), an additional year in the KBO could catapult him back onto the big league radar.
KBO’s NC Dinos Sign Eric Jokisch, Release Daniel Castano
The NC Dinos of the Korea Baseball Organization announced yesterday that they’ve signed left-hander Eric Jokisch to a $100K deal for the rest of the season. The news was relayed (on X) by Dan Kurtz of MyKBO, who tweeted earlier this week that the Dinos were waiving southpaw Daniel Castano to facilitate a deal for another foreign player.
KBO teams can have a maximum of two non-Korean pitchers on their roster. The Dinos signed former Red Sox left-hander Kyle Hart over the offseason. He’s having a very nice season, working to a 2.47 ERA through 124 innings. Castano had a more pedestrian 4.35 mark in 111 2/3 frames. He struck out 18.7% of opponents against a tidy 5.3% walk percentage.
Castano is a former 19th round pick by the Cardinals who went to the Marlins in the Marcell Ozuna/Sandy Alcantara/Zac Gallen trade. He’d go on to make 24 appearances over parts of four seasons in Miami, working mostly as a depth starter. Castano turned in a 4.47 ERA in 88 2/3 big league innings. He made the jump to Korea last offseason, not long after being waived by Miami in September.
Jokisch is also a former big leaguer, though he’s been far more established in Korea. His major league work consists of four appearances for the Cubs a decade ago. The Northwestern product subsequently kicked off a very successful KBO run in which he turned in a 2.85 earned run average over five seasons as a member of the Kiwoom Heroes. His tenure with the Heroes came to an unfortunate end last summer when he suffered a muscle tear in his leg that led the team to release him. (Injured players would still count against a KBO team’s foreign player limit.) The 35-year-old gets a new opportunity to resume his career.
In one other bit of KBO news — or more accurately, lack thereof — reporter Daniel Kim tweets that July 31 was the Korean league’s trade deadline. There were zero trades made.
KBO’s Doosan Bears Sign Jared Young
The Doosan Bears of the Korea Baseball Organization announced they’ve signed utilityman Jared Young (h/t to Jeeho Yoo of Yonhap News). The Old Dominion product had been playing in Triple-A with the Cardinals.
Young was a 15th round pick by the Cubs back in 2017. He reached the majors late in the 2022 season and appeared in 22 games over the next two years. The left-handed hitter ran a .210/.290/.435 line with a pair of home runs across 69 trips to the plate. Chicago placed Young on waivers at the start of last offseason. St. Louis nabbed him from their rival and successfully passed him through waivers during Spring Training.
Assigned to their top farm team in Memphis, Young was hitting .285/.411/.506. He connected on 11 homers and walked at a strong 14.3% clip against an 18.5% strikeout rate. The Cards never called him up, but his excellent work in the upper minors gets him a look in the KBO. That surely comes with a nice pay bump compared to his Triple-A salary.
KBO teams are only permitted to roster three foreign-born players. As a corresponding move for signing Young, they waived outfielder Henry Ramos. The 32-year-old signed with the Bears over the winter. He was hitting .306/.360/.482 in 80 games. That’s strong production, but Yoo notes (on X) that the Bears’ coaching staff has taken issue with Ramos’ defense and baserunning. A veteran of 12 minor league seasons, Ramos has logged brief MLB time with the Diamondbacks and Reds.