Nationals trim three more from roster
Hinckley was named by Bowden as a long shot to make the team this season despite not pitching above double-A. However, he struggled in the spring and posted a 12.00 ERA in six innings of work.
Smith was returning from surgery and will continue to work his way back as a member of the New Orleans bullpen.
Karp, a former No. 1 draft pick, has struggled in recent years despite his huge promise and No. 1 starter repertoire. He may be converted to the bullpen this year and join Smith in the New Orleans pen.
In other news, second baseman Jose Vidro hyper-extended his elbow and should be out for a few days. It is not considered serious.