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Castro (knee) was spotted taking part in batting practice prior to Wednesday's game against the Mariners, Danielle Lerner of the Houston Chronicle reports.
Castro has been taking part in a variety of baseball activities in recent days after landing on the 10-day injured list Aug. 29 with right knee discomfort, but the Astros will likely want to see him catch multiple bullpen sessions and/or simulated games without incident before activating him. Until Castro is ready to go, Garrett Stubbs will serve as the top understudy to No. 1 catcher Martin Maldonado.
