 In the 2008 season Robertson would make six appearances for the Diamondbacks before being traded in the off season to the New York Mets for Scott Schoeneweis.he would spend the entire 2009 season in the minor leagues and the Mets released him at the conclusion of the 2009 season.Robertson pitched for the Southern Maryland Blue Crabs in the 2010 season in their rotation and in the bullpen; he has not pitched professionally since the conclusion of the Blue Crabs 2010 season.