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Diaz signed a minor-league contract with the Giants on Dec. 28.
The Astros released Diaz in late May after he started the Triple-A season with a 9.64 ERA through 14 innings. He then signed with the Tigers and finished the year allowing just seven earned runs over 32 minor-league frames. If the 30-year-old righty is able to continue his dominant run in 2025, he may have a chance at contributing to the Giants' bullpen throughout the year.