In the end, Joe Girardi's job security had more to do with dealing with the front office than his rookie-laden team. The first-year manager was fired by the Marlins on Tuesday, a move that seemed predestined following his confrontation with owner Jeffrey Loria. One of the leading candidates for the National League Manager of the Year Award, Girardi had an outstanding debut in the dugout, guiding baseball's youngest and lowest-paid team to a surprising 78-84 record.