White Sox Sign Reliever Seranthony Domínguez to Two-Year, $20 Million Deal

The Chicago White Sox continued their offseason rebuild on Friday, agreeing to a two-year, $20 million contract with veteran reliever Seranthony Domínguez, according to ESPN's Jeff Passan. The deal, which is pending a physical, includes a mutual option and incentives that can push the total guarantee to $22 million.

The signing comes just three days after the White Sox traded Luis Robert Jr. to the New York Mets, reallocating the $20 million Robert was owed in 2026. It marks the third multiyear contract Chicago has handed out this winter, following deals for Japanese slugger Munetaka Murakami and left-hander Anthony Kay.

Domínguez is expected to close for the White Sox, bringing much-needed stability to a late-innings role that was plagued by inconsistency in 2025. The 31-year-old right-hander posted a 3.16 ERA across 67 appearances last season between Baltimore and Toronto, striking out 79 batters in 62⅔ innings while holding opponents to a .198 batting average.

Contract Details and Market Context

According to MLB.com's Tim Stebbins, the mutual option included in Domínguez's contract is extremely unlikely to be picked up, regardless of where he's playing. The $20 million guarantee represents a significant investment for a White Sox team coming off a franchise-record 121 losses, though it's fair to assume some portion of that payment reflects the premium required to sign with a rebuilding team.

The deal came together at an advantageous time for Domínguez. As ESPN reported, he was the best relief pitcher still available after a run on closers in the early part of free agency, allowing him to parlay the scarcity of closer-caliber arms into a multiyear deal.

Elite Stuff, Control Questions

Domínguez brings some of the best raw stuff in baseball to the South Side. According to ESPN, each of his five pitches is above average, led by a fastball that averaged 97.7 mph in 2025—ranking in the 94th percentile in MLB. His sweeper and splitter each generated whiff rates near 50 percent, making him a nightmare for opposing hitters.

His Statcast rankings paint the picture of a high-octane reliever: 94th percentile in whiff rate, 91st percentile in strikeout rate, 89th percentile in expected batting average against. But there's a red flag buried in those numbers—Domínguez ranked in the 1st percentile in walk rate.

Consistent strike-throwing has been Domínguez's bugaboo throughout his career. In 2025, he set career highs in walks (36), walk rate (13.8%), and wild pitches (12, which led the league). His 79 strikeouts also represented a career best, but the improvements came hand in hand with increased inaccuracy.

Still, Domínguez was highly effective when he threw strikes. Right-handed batters managed just a .132 batting average and .245 slugging percentage against him. His splitter, which he introduced in 2025, held opponents to a .114 batting average and .159 slugging percentage and became his primary weapon against left-handed hitters.

Career Arc and Closer Experience

Since debuting with the Philadelphia Phillies in 2018, Domínguez has made 322 appearances across eight seasons, posting a 3.50 ERA and striking out 27.9% of batters faced. He's recorded 40 career saves, including a career-high 16 as a rookie.

Most recently, Domínguez took over as Baltimore's closer in 2024 after the Orioles moved on from Craig Kimbrel, recording 11 saves in 12 chances over the final two months before yielding the role back to Félix Bautista in 2025. His closing experience will be valuable for manager Will Venable.

Domínguez also gained valuable postseason experience with Toronto last fall, pitching 11⅓ innings across 12 appearances and appearing in five of seven World Series games with a 3.18 ERA.

Addressing the White Sox's Biggest Weakness

The White Sox desperately needed late-inning help. In 2025, Chicago recorded 25 saves and 24 blown saves—a pitiful save percentage that reflected broader bullpen struggles. According to Sox Machine's analysis, the White Sox bullpen performed worst in the league in nearly every win probability metric, and the number of late-inning failures made their record worse than underlying metrics suggested.

Jordan Leasure led the White Sox with seven saves last season, while Grant Taylor recorded six. Both young right-handers throw hard, and along with Domínguez, ESPN noted they'll form a big-stuff bullpen for Venable to deploy in high-leverage situations.

As Sox On 35th's Joe Binder and Jordan Lazowski wrote, "For the White Sox, Dominguez is the clear front-runner to serve as the team's closer." MLB.com's Tim Stebbins agreed, noting that given Domínguez's experience, he could be a leading candidate for ninth-inning work.

2026 Projections and Trade Potential

Baseball Reference's Marcels projections forecast a slight regression for Domínguez in 2026, projecting a 3.92 ERA across 62 innings with 66 strikeouts and 27 walks. The projection system sees him posting 4 saves while maintaining strong strikeout numbers (9.6 K/9) but still walking too many batters (3.9 BB/9).

If Domínguez can throw more strikes and harness his elite stuff, the White Sox will have either a cost-effective closer or a strong trade candidate to offer at the July deadline. Given Chicago's rebuild timeline, the latter scenario may be more likely if Domínguez pitches well in the first half.

Broader Roster Context

General Manager Chris Getz had telegraphed this move earlier in the week. Speaking to MLB.com on Wednesday—before the Domínguez signing—Getz said: "We plan on being very active. We've already been talking to agents and clubs, and anticipate a roster that's going to continue to evolve."

Getz also emphasized flexibility in how the White Sox would reinvest resources after trading Robert. "When you move on from a Luis Robert, there's an assumption that a certain position needs to be filled," he said. "But it's increasing talent on the team to help us win ballgames. That could come in starting pitching, relievers, balancing right-handed vs. left-handed. So we are very open-minded and excited to get to work in being creative and bringing in that talent."

The White Sox are piecing together their best roster in years as they aim to transition from the record 121-loss season in 2024 to eventual contention. Along with Domínguez, Murakami, Kay, free agent left-hander Sean Newcomb, and the return from the Robert trade (Luisangel Acuña), Chicago has been active in reshaping the roster.

Final Thoughts

The Domínguez signing represents exactly the type of calculated risk the White Sox should be taking at this stage of their rebuild. At $10 million per year, they're not breaking the bank for a 31-year-old reliever with control issues. But they're getting elite stuff, closer experience, and the potential for significant trade value if he performs.

For Domínguez, joining a rebuilding team offers an opportunity to establish himself as a full-time closer and boost his value for the next contract. As Bleacher Nation suggested, even if the White Sox aren't competing within the next two years—which seems likely—a trade could position Domínguez as a true MLB closer, allowing him to command more money on his next deal.

The White Sox bullpen desperately needed an identity and a clear hierarchy after last year's disaster. Jordan Leasure and Grant Taylor showed flashes, but neither inspired confidence as a full-time closer. Domínguez brings the experience and swing-and-miss stuff to anchor the late innings, even if his walk issues remain a concern.

If the fastball command improves even marginally, the White Sox could have a legitimate back-end weapon. If it doesn't, they'll still have a valuable trade chip come July. Either way, Chris Getz is making moves to add talent and create roster flexibility—a stark contrast to the organizational paralysis that defined much of the post-2021 era.

The White Sox won't be good in 2026. But they're starting to resemble something that looks somewhat-close to a functional baseball team again, and that's progress.