Castillo signed with the NPB's Tohoku Rakuten Golden Eagles on Saturday.

Castillo appeared in just 99 games at the big-league level from 2014 to 2016, hitting a modest .262/.301/.379, though he could potentially have gotten more opportunities as at least a bench piece if not for an odd contract situation which gave the Red Sox strong incentives to keep him off the 40-man roster. Even if he looks good with regular at-bats in Japan, his MLB days are likely over, as he'll turn 34 in July.

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