Smith (forearm) was placed on the 15-day DL on Sunday, Jason Mastrodonato of the Boston Herald reports.

Smith is still in the midst of a throwing program after straining his right forearm in spring training. He'll need to resume pitching off a mound and facing hitters before heading out on a rehab assignment in the minor leagues. Once activated from the DL, Smith projects to serve as one of the Red Sox's top setup men.

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