Tigers acquired RHP Collin Balester from the Nationals in exchange for RHP Ryan Perry.
Balester, 25, posted a 4.54 ERA over 23 relief appearances with the Nationals this past season, despite a very solid 34/14 K/BB ratio over 35 2/3 innings. He has pitched much better since being converted from a starter to a reliever and should be a nice addition to the middle innings for Detroit.