The 35-year-old Castillo was preparing for the final season of a four-year, $24 million contract. He batted .235 with no homers and 17 RBIs in 247 at-bats last season before losing his starting spot to Ruben Tejada and Luis Hernandez.
He was among five candidates for the role this spring, a list that includes Brad Emaus, Justin Turner, Daniel Murphy and Hernandez.
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