The Nationals have released lefty Brett Mooneyham,who was their third-round pick in the 2012 draft, Matt Eddy of Baseball America tweets. Mooneyham, a 25-year-old Stanford product, has struggled badly with control and shifted exclusively to the pen at the A-ball level this year. He owned just a 6.41 ERA over 19 2/3 frames with 16 strikeouts against 13 walks.