In baseball, a fourth outfielder is a backup outfielder, who does not have the hitting skills to regularly play in the corner outfield, but does not have the fielding skills to play center field; for these players, this often leads to playing time that has been called "erratic and unpredictable". Often, fourth outfielders are outfield prospects who have not settled on one outfield position when arriving in the Major Leagues, veteran players seeking additional playing time to extend their careers, or part-time position players who double as designated hitters.