As expected, the Rangers have placed Mitch Moreland on the 15 day disabled list to make room on the 25 man roster for pitcher Roy Oswalt, whose contract was purchased today. To make room on the 40 man roster for Oswalt, the Rangers have designated righthanded pitcher Mark Hamburger for assignment.

Moreland is expected to be sidelined for 4-6 weeks with a strained left hamstring, which he injured in San Diego while trying to beat out a double play grounder. With Moreland out, Michael Young is expected to get the bulk of the playing time at first base, and Leonys Martin, who was expected to be active for just a few days while Josh Hamilton recovered from an intestinal virus, will stick around and be part of the outfield/DH rotation.

Hamburger was acquired from the Minnesota Twins in exchange for Eddie Guardado in August of 2008. Hamburger impressed last season in a relief role with Frisco and Round Rock, ultimately appearing in five games in the major leagues. His velocity has reportedly been off this year, though, and he's posted a 6.55 ERA while posting a 1.919 WHIP for Round Rock. Jason Cole has tweeted that he doesn't expect Hamburger to be claimed off of waivers, and if Hamburger does clear waivers, the Rangers could outright him to the minors.