Hyeseong Kim

10:41pm: The Heroes announced that the posting window will open at 8:00 am Eastern on Thursday. MLB is evidently waiting until tomorrow to formally notify teams about his availability. Kim will have until 5:00 pm Eastern on January 3 to sign (X link via Yoo).

9:17pm: The KBO announced that the Heroes have officially made Kim available via the posting system. The posting went into effect at noon on Wednesday in South Korean time, not at 12:00 pm Eastern as previously reported. According to Jeeho Yoo of Yonhap News (X link), the 30-day signing period will officially begin at 8:00 a.m. Eastern the morning after MLB informs teams of Kim’s posting.

2:30pm: Infielder Hyeseong Kim is expected to be officially posted by the Kiwoom Heroes of the Korea Baseball Organization on Wednesday at noon Eastern/11am Central, per Jon Morosi of MLB Network (X link). Once it’s official, that will start a 30-day window where all MLB clubs can negotiate with Kim and his representatives. If no deal is signed in that time, he will return to the Heroes for the 2025 season. (The NPB posting window has been expanded from 30 days to 45 days but KBO players still have a 30-day time frame.)

Kim, 26 in January, said himself last week that he believed the formal posting process was about a week away. It appears that timeline is holding, so Kim will be officially be available to MLB clubs as of tomorrow. Kim will be considered a “professional” under MLB rules because he is at least 25 years old and has at least six years of experience in a foreign league. As such, he can sign a deal of any length or dollar amount, depending on what MLB clubs are willing to offer. That’s in contrast to someone like Roki Sasaki, who is only 23 years old and will therefore be capped by the international bonus system.

It isn’t likely that Kim will secure a massive deal, but he could still have some interest. He is expected to provide a somewhat similar skillset to his former double play partner Ha-Seong Kim, no relation, as both players are considered sure-handed defenders at multiple spots on the diamond. Hyeseong has mostly played the two middle infield spots, but also with brief stints at third base and in the outfield corners.

Offensively, Hyeseong is a tick below Ha-Seong, however. Hyeseong has slashed .304/.364/.403 in his eight KBO seasons whereas Ha-Seong hit .294/.373/.493 in his seven campaigns in Korea. The batting average and on-base numbers are fairly close but Ha-Seong clearly has the edge in terms of slugging. Hyeseong got to 11 home runs in 2024, a career high for him, whereas Ha-Seong had 19 or more homers in his final six KBO seasons, including 30 in the final year.

Still, even if Hyeseong is a tick below Ha-Seong in the power department, his youth and athleticism should work in his favor. As mentioned, he is considered a strong defender and could be placed at multiple different positions. He has stolen between 20 and 46 bases in each of the past six seasons.

MLBTR predicted he could secure a three-year deal with a $24MM guarantee as part of the annual Top 50 Free Agents post. However, predicting the interest in a player making the move from overseas can be difficult, as players like Jung Hoo Lee and Masataka Yoshida both proved to have much more earning power than was assumed by forecasters.

The Mariners are reportedly interested in Kim but it stands to reason that plenty of others would be in the mix as well, given his versatility. Clubs like the Giants, White Sox, Marlins, Brewers and others are speculative fits. Players like Willy Adames, Ha-Seong Kim, Gleyber Torres and others are also available in the middle infield free agent market. They will be joined by Hyeseong but the 30-day posting window means there will be clarity on his status by the first few days of 2025, at the latest.

In addition to the money going to Kim, a signing club will also have to pay a posting fee to the Heroes, the value of which will depend upon the size of the contract. The fee will be calculated as 20% of the contract’s first $25MM, plus 17.5% of the next $25MM and 15% of any dollars thereafter. Additional earnings, such as performance bonuses/incentives or salaries on option years fall under that purview once they are unlocked or exercised.

It’s already widely known that the Korea Baseball Organization’s Kiwoom Heroes will post infielder Hyeseong Kim for major league teams this offseason. An exact timetable, however, hadn’t come into focus until today. Kim himself tells Jee-ho Yoo of South Korea’s Yonhap News Agency (X link) that he expects the posting to be formalized next week. He’s planning to travel to the United States early next week in advance of the process.

Kim, who’ll turn 26 in January, has long looked the part of an interesting entrant into the offseason free agent market. The former double-play partner of current big leaguer Ha-Seong Kim, he’s old enough and has enough experience in the KBO to be considered a “professional” under Major League Baseball’s international free agent parameters. That allows him to sign a major league deal of any length and for any amount (unlike, say, NPB star Roki Sasaki, who’ll be limited to a minor league deal with a bonus that falls within the guidelines of MLB’s hard-capped international amateur system).

The left-handed-hitting Kim has turned in four straight above-average seasons at the plate in the KBO, batting over .300 with an on-base percentage of at least .372 in each of those four seasons. He’s light on power but did connect on a career-high 11 home runs this past season, adding in 26 doubles and four triples. Hitting the ball over the fence has never been Kim’s calling card, however. He’s developed into a KBO star due to his outstanding bat-to-ball skills, plus speed and plus glovework. Over the past four seasons, he’s swiped 135 bases in 155 attempts (87.1% success rate) and lowered his strikeout rate each season, culminating in just a 10.9% strikeout rate in 2024.

Overall, Kim carries a .321/.381/.418 over the past four seasons, including a .326/.383/.458 batting line this past season. He’s regarded as a plus defensive second baseman who can handle shortstop and has ample experience at both positions. The Mariners have already been linked to Kim, and he ought to command a fair bit of interest from other teams once his free agency begins in earnest. The A’s, Royals, Pirates, Braves, Yankees and Brewers make varying levels of sense as speculative fits.

Once the Heroes formally post Kim, it will open a 45-day window during which he and his representatives at CAA Baseball can negotiate freely with all 30 major league teams. Any team that signs Kim will be paying not only the agreed-upon guarantee to the player himself, but a formal posting/release fee to the Heroes. That fee, which is in on top of the contract, is equal to 20% of the contract’s first $25MM, plus 17.5% of the next $25MM and 15% of any dollars thereafter. Additional earnings, such as performance bonuses/incentives or salaries on option years fall under that purview once they are unlocked or exercised.