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The Red Sox selected Stock's contract from Triple-A Worcester on Monday, Jen McCaffrey of The Athletic reports.
Stock will provide the bullpen with some length following Sunday's doubleheader against the Cardinals. The 35-year-old made one start and one relief appearance at Worcester, tossing 8.1 scoreless frames with a 12:3 K:BB. Stock has not made an appearance at the big-league level since 2021.