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Castillo was designated for assignment by the Royals on Tuesday, Anne Rogers of MLB.com reports.

Kansas City had to free up a 40-man roster spot for Hunter Renfroe, whose two-year, $13 million contract is now official. Castillo, 24, holds a 5.43 ERA, 1.37 WHIP and 47:24 K:BB in 59.2 career major-league innings.

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