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Castillo signed a minor-league contract with the Nationals on Thursday, Jesse Dougherty of The Washington Post reports.
Castillo played abroad for the last three seasons, primarily in Mexico and Japan. He'll now return to the majors after posting a .262/.301/.379 line across 337 plate appearances with the Red Sox from 2014 to 2016. Though it's unclear how the Nationals may add to their roster during the rest of the offseason, Castillo could serve as a bench piece for the club -- particularly if the designated hitter is instituted in the National League.