Former White Sox Breakout Arm Just Hit Another Frustrating Turn

Despite his powerful arm, Gregory Santos's second chance with the Giants underscores the ongoing challenges he's faced since his standout year with the White Sox.

Gregory Santos was supposed to be one of the White Sox’s rare bright spots from a miserable 2023, the kind of young bullpen arm a team could actually point to and build around. Instead, the right-hander’s latest shot at getting his career back on track has already hit another wall.

The Giants designated Santos for assignment this week, then announced that he cleared waivers and was outrighted to Triple-A Sacramento. San Francisco also claimed RHP Eric Cerantola off waivers from Kansas City and optioned him to Sacramento.

Santos’ path since that breakout White Sox season has been rough. In 2023, the 23-year-old posted a 3.39 ERA in 60 appearances out of the bullpen, one of the few encouraging developments during a 100-loss year in Chicago. That came after the White Sox had gone 93-69 and won the division in 2021, then slipped to 81-81 in 2022 before a disastrous follow-up under new manager Pedro Grifol.

Chicago moved Santos to Seattle before the 2024 season in a deal that brought back OF Zach DeLoach, RHP Prelander Berroa and a compensation pick. But Santos never got much of a chance to settle in with the Mariners.

He was limited to eight games in 2024 because of injuries, then appeared in just eight more in 2025. After that season, Seattle non-tendered him.

He then signed a minor league deal with the Giants, the organization that originally signed him out of the Dominican Republic. Even there, the results never really came. Santos posted a 6.27 ERA in the minors, then got a big-league look and allowed two earned runs in five innings before being designated for assignment.

The stuff is still there. Santos’ fastball and sinker sit in the upper-90s, and his upper-80s slider remains his best weapon. But the injuries have kept interrupting everything, and his command has been shaky too, with a 14.3% walk rate in Triple-A before his call-up.

The White Sox may still end up getting something useful from the deal, even with DeLoach no longer in the organization. Berroa is working back from Tommy John surgery and could eventually fit into the bullpen. The compensation pick turned into LHP Blake Larson, who has returned to the mound after surgery and is viewed by the team as having plenty of upside.

For now, though, Santos’ third straight year of struggling to stick in the majors makes the White Sox’s side of that controversial trade look better than it once did.

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