Castro was optioned to Double-A Altoona on Saturday.

He makes way for Gregory Polanco (hip), who was activated from the injured list. Castro has never played at Triple-A and seems to be getting chances when the Pirates deal with injuries due to his standing on the 40-man roster. He is hitting .306/.349/.549 with 11 home runs and five steals in 49 games at Double-A.

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