The Mariners have designated outfielder Leonys Martin for assignment, according to Ryan Divish of the Seattle Times (Twitter links). First baseman Dan Vogelbach and right-hander Chris Heston have been called up from Triple-A Tacoma in corresponding moves, while righty Chase De Jong has been sent down to Triple-A.
[Updated Mariners depth chart at Roster Resource]
Martin is off to a very rough start this season, hitting just .111/.172/.130 through his first 58 plate appearances.