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The Cubs selected Horn to their 40-man roster Tuesday, Andy Martinez of Marquee Sports Network reports.
Horn spent most of last season with Triple-A Iowa, posting a 4.58 ERA and 1.53 WHIP across 53 innings. The 25-yera-old southpaw is now protected from the Rule 5 Draft next month and could work his way into the major-league bullpen at some point next season.
