Castro (knee) was activated from the 10-day injured list ahead of Friday's game against the Diamondbacks, Jake Kaplan of The Athletic reports.

Castro has been on the injured list since Aug. 29 with right knee discomfort. He began a rehab assignment with Triple-A Sugar Land on Monday and wound up going 2-for-6 with a pair of walks and a run scored across two games. He should resume serving as Martin Maldonado's backup going forward, but per Danielle Lerner of the Houston Chronicle, he's set to start behind the plate Friday and bat ninth.

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