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The Diamondbacks selected Castillo's contract from Triple-A Reno on Thursday.

Castillo got a late start to the season with Reno due to an adductor injury, but he made five appearances there and allowed just one run with a 7:0 K:BB over 5.1 innings. The left-hander missed much of 2024 with a hand injury, and when he makes an appearance, it will be his first in the majors since 2023.

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