Seranthony Dominguez Signs Two-Year Deal with Chicago White Sox
The Chicago White Sox have added a significant piece to their bullpen, agreeing to a two-year, $20 million contract with right-handed reliever Seranthony Dominguez. The deal, reported by MLB.com's Mark Feinsand on Friday, marks a strategic move by the team to bolster their high-leverage relief options as they prepare for the upcoming MLB season.
High-Leverage Reliever with Postseason Experience
Seranthony Dominguez, 30, entered free agency for the first time in his career, bringing with him a reputation as a trusted, high-leverage bullpen arm. His most recent stint was with the Toronto Blue Jays, where he played a crucial role in their journey to the World Series. Dominguez pitched to a 3.00 ERA in 24 regular-season games with the Blue Jays and appeared in 12 postseason games, going 2-0 with a 3.18 ERA. His standout performance included a memorable escape in the 10th inning of Game 7 of the World Series.
Postseason Presence
Dominguez has proven to be comfortable in high-pressure situations, having pitched in the postseason in four consecutive seasons. He previously contributed to the Phillies in 2022-23 and the Orioles in 2024. Throughout his seven-year career, he has recorded 40 saves, showcasing his ability to deliver in critical moments.
Strikeout Artist with Swing-and-Miss Stuff
One of Dominguez's defining traits is his strikeout ability. Last season, he notched 79 strikeouts in 62 2/3 innings, posting an 11.3 K/9—his highest mark since his rookie season in 2018. However, his command has been a point of concern, as evidenced by his 5.2 BB/9 in '25, the worst single-season rate of his career.
Evolution of Pitch Mix
Dominguez's pitch mix has been evolving, and he has introduced new weapons to his arsenal. Last season, he added a splitter and a curveball, both of which he uses predominantly against left-handed hitters. The splitter has proven particularly successful, holding the opposition to a .114 batting average with a 49.5% swing-and-miss rate. Against righties, he relies on a sweeper and a sinker, embracing a two-fastball look.
Platoon Splits and Future Prospects
Dominguez handles right-handed hitters exceptionally well, holding them to a .132 batting average and a .451 OPS last season. However, his platoon split was sizable, as lefties batted .277 with an .816 OPS against him. The introduction of the splitter offers significant upside to combat these problems moving forward.
Early Career and International Roots
Dominguez originally signed with the Phillies as an international free agent out of the Dominican Republic in 2011. He spent parts of six seasons with Philadelphia before being traded to Baltimore at the trade deadline in '24. In total, he owns a 3.50 ERA across 322 career appearances.
Impact on the Chicago White Sox
The addition of Seranthony Dominguez is expected to provide a significant boost to the Chicago White Sox's bullpen. With his postseason experience and ability to perform under pressure, Dominguez is poised to be a key figure in high-leverage situations. The two-year deal represents a balanced commitment for the White Sox, offering stability without committing excessively to a reliever.
Looking Ahead
As the MLB offseason progresses, the White Sox continue to make strategic moves to strengthen their roster. The signing of Dominguez underscores their commitment to competitiveness in the near future. Fans and analysts alike will be watching closely to see how this addition shapes the team's prospects for the upcoming season.