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Castro was optioned to Triple-A Indianapolis on Saturday, Jason Mackey of the Pittsburgh Post-Gazette reports.

Castro has struggled defensively since being recalled May 12, committing five errors over 19 games. He has also struggled from the plate, batting .197 with only four extra-base hits over 71 at-bats. His demotion clears a spot on the major-league roster for Travis Swaggerty, who was called up from Indianapolis on Saturday and will make his MLB debut Sunday.

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