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4h ago

Giants DFA Mason Black, Claim Reiver Sanmartin and Justin Dean on First Day of Offseason

The moves reflect early 40-man shuffling across MLB driven by waiver opportunities plus injured-list activations.

TORONTO, ONTARIO - OCTOBER 31: (L-R) Enrique Hernández #8, Justin Dean #75, Andy Pages #44, and Miguel Rojas #72 of the Los Angeles Dodgers celebrate after defeating the Toronto Blue Jays 3-1 in game six of the 2025 World Series at Rogers Center on October 31, 2025 in Toronto, Ontario. (Photo by Emilee Chinn/Getty Images)
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Dodgers Andy Pages (44), Enrique Hernandez (8), and Justin Dean (75) celebrate a 3-1 win over the Brewers in game 3 in the NLCS at Dodger Stadium on Thursday, Oct. 16, 2025. (Photo by David Crane, Los Angeles Daily News/SCNG)

Overview

  • San Francisco designated Black, 25, after posting a 6.44 ERA over nine MLB appearances since his 2024 debut, placing him in the DFA window for trade, waivers or outright assignment.
  • Left-hander Reiver Sanmartin was claimed from the Reds as low-cost depth following Tommy John surgery in July 2023 and a brief 1.2-inning return to the majors in September 2025.
  • Outfielder Justin Dean arrived via waivers from the Dodgers after a late-season role as a defensive replacement and pinch runner, following a .289/.378/.431 line in 90 Triple-A games.
  • Cincinnati exposed Sanmartin to waivers while creating 40-man space by activating multiple pitchers from the 60-day injured list and executing additional roster moves.
  • Thursday opened MLB’s offseason transaction period, with the Giants using waivers to bolster pitching depth and add a versatile defensive outfielder.