MIAMI – At the trade deadline in 2010, Tanner Roark amounted to what baseball people call “inventory” — a spare arm to suck up innings in the bushes. It only took a journeyman infielder for the Washington Nationals to pry him and another Class A pitcher from the Texas Rangers. Roark refused to the let the label stick. He climbed up the Nationals' farm system. He earned an invitation to major league spring training. He joined the Nationals' bullpen, and in long relief he pitched like a sorcerer.
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