The Chicago White Sox just added some serious edge to their bullpen, locking in right-hander Seranthony Domínguez on a two-year, $20 million deal. It's a move that signals the Sox aren’t just tinkering-they’re reshaping. Domínguez isn’t your traditional closer, but he’s been a trusted late-inning weapon for years, and now he’s bringing that big-game arm to the South Side.
This signing adds another layer to what’s already been a busy offseason for Chicago. The front office has been aggressive, bringing in Japanese slugger Munetaka Murakami along with left-handers Anthony Kay and Sean Newcomb.
And earlier this week, they pulled off a blockbuster, sending Luis Robert Jr. out in exchange for infielder Luisangel Acuña and pitching prospect Truman Pauley. That’s a lot of movement, and Domínguez could end up being one of the most important pieces if this team is serious about contending-or at least staying competitive-in the late innings.
Now, let’s talk about what Domínguez brings. He’s not flashy in terms of save totals-just 24 over the last four seasons-but he’s been rock-solid in high-leverage spots.
Over that span, he’s racked up 55 holds and posted a 3.60 ERA while suiting up for the Orioles, Phillies, and Blue Jays. He’s the kind of guy you call on when the game’s hanging in the balance in the seventh or eighth, and you need someone who can miss bats.
And miss bats he does. Domínguez has long leaned on elite strikeout stuff to get out of jams, even when his command gets shaky.
In 2025, he made some notable tweaks to his arsenal-introducing a splitter to better attack lefties and dialing up his sweeper usage against right-handed hitters. The adjustments didn’t dramatically change his stat line, but they showed he’s still evolving, still trying to find new ways to get hitters out.
That said, he’s not without his blemishes. He led the league in wild pitches last season and issued 36 walks in just over 62 innings.
But here’s the thing: even with those control issues, he still managed a 3.16 ERA and posted his best strikeout rate since his rookie year. That tells you everything you need to know about how electric his stuff can be when it’s on.
Durability? Check.
Domínguez has thrown at least 50 innings in each of the last four seasons. And when the calendar flips to October, he doesn’t just show up-he locks in.
Across 29 career postseason appearances, he owns a 1.86 ERA, which is elite territory. The Blue Jays leaned on him heavily during their 2025 run to the World Series after acquiring him at the deadline, and he delivered a 3.18 ERA in 11 1/3 playoff innings.
His most recent postseason run was a rollercoaster-he walked more guys than he struck out, but still held opponents to just five hits and four earned runs across 12 outings. That’s Seranthony in a nutshell: not always clean, but always competitive. When the lights are brightest, he finds a way.
For the White Sox, this move isn’t just about filling innings-it’s about adding a proven postseason arm who knows how to navigate pressure. Domínguez may not be the closer, but he’s the kind of pitcher who can bridge the gap to whoever is. And if Chicago finds itself playing meaningful baseball late in the year, they’ll be glad they have him.