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06/22/2012 4:55 PM EST

Rangers purchase contract of RHP Roy Oswalt from Triple-A Round Rock; Place 1B Mitch Moreland on 15-day disabled list

RHP Mark Hamburger designated for assignment

Arlington, Texas - The Texas Rangers announced the following three roster moves this afternoon:

  • Purchased the contract of right-handed pitcher Roy Oswalt (#44) from Triple-A Round Rock.
  • Placed first baseman Mitch Moreland on the 15-day disabled list, retroactive to Wednesday, with a left hamstring strain.
  • Designated right-handed pitcher Mark Hamburger for assignment.

Oswalt, 34, is scheduled to make his Texas debut in a start tonight against Colorado.  He made 4 minor league starts in the organization after signing with Texas on May 29, combining to go 1-1 with a 5.87 ERA (10 ER/15.1 IP), allowing 4 walks against 13 strikeouts.  His last appearance in a major league game was with Philadelphia in 2011 National League Division Series Game 4 in St. Louis.  The three-time All-Star went 9-10 with a 3.69 ERA (57 ER/139.0 IP) in 23 games/starts for the Phillies in 2011 and has a career 159-93 record with a 3.21 ERA over 339 games/326 starts.

Moreland left Tuesday's game in San Diego in the second inning after suffering the hamstring injury while attempting to beat out a double play ball at first base.  He has batted .272 with 10 home runs and 25 RBI in 55 games for Texas this season, starting a team-high 38 games at first base.  The earliest date he would be eligible to return is July 5.

Hamburger, 25, has spent the season with Triple-A Round Rock, going 0-2 with a 6.55 ERA (33 ER/45.1 IP) in 21 games/3 starts.  The Rangers have 10 days to trade, release, or outright Hamburger to the minor leagues.

With these moves, the Rangers still have a full 40-man roster.

This story was not subject to the approval of Major League Baseball or its clubs.