The Nationals have recalled left-hander Sammy Solis from Double-A Harrisburg and placed righty David Carpenter on the paternity list.
Solis made his major league debut by pitching in five games for Washington in late April and early May. He managed three shutout appearances before getting clobbered for five runs in three innings over his last two.
Carpenter, who came over in a mid-June trade from the Yankees, has since given up just one run in six innings.