	Playing for the Wisconsin Timber Rattlers of the Class A Midwest League in 2012, the Timber Rattlers won the Midwest League championship. In 2013, the Brewers assigned Shackelford to the Arizona Fall League, where he was a member of the championship-winning Surprise Saguaros. After the 2013 season, the Brewers added Shackelford to their 40-man roster. He was designated for assignment on July 17, 2014, to make room for Irving Falu.