The White Sox have signed right-handed reliever Seranthony Dominguez to a two-year deal, per ESPN’s Jeff Passan. The agreement is worth $20 million, the same amount the Mets paid for Luis Robert Jr.’s contract, allowing Chris Getz and Co. to reinvest.
Dominguez, 31, is best known for his time with the Phillies, where he emerged as a key bullpen arm during the club’s postseason runs. Signed out of the Dominican Republic, he debuted in 2018 and quickly made his presence felt during his rookie season, posting a 2.95 ERA with 74 strikeouts and 16 saves over 58 innings. For his career, he has thrown 206 innings, striking out 27.9% of batters and walking 10.5%.
After spending parts of two seasons with the Orioles, Dominguez joined the Blue Jays at this year’s trade deadline and played a key role in their bullpen throughout their playoff run. His control issues did lead to mixed results, though he still posted a 3.18 ERA over 12 postseason appearances. Taking a step back and looking at 2025 as a whole, Dominiguez finished with a 3.16 ERA over 62.2 innings, posting a 30.3% strikeout rate and the highest walk rate of his career at 13.8%.
The right-hander features a five-pitch mix but relies mostly on his fastball, sweeper, split-finger, and changeup. His sweeper and split-finger are his best two pitches in terms of whiff rate, with both near 50%. He ranked in the 90th percentile or higher this season in expected batting average against (xBA), whiff rate, strikeout rate, and fastball velocity, averaging 97.7 mph.
For the White Sox, Dominguez is the clear front-runner to serve as the team’s closer, as Passan has pointed out. The right-hander joins newcomers such as Anthony Kay, Sean Newcomb, Luisangel Acuña, and Munetaka Murakami, along with a bullpen that features prominent members like Grant Taylor and Jordan Leasure.
It is unclear whether the White Sox will continue to spend the remainder of Robert Jr.’s freed-up contract, but either way, this is a step in the right direction to shore up what was an understaffed bullpen in 2025.
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