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The Texas Rangers purchased the 34-year-old right-hander’s contract from Triple-A Round Rock on Friday, and Oswalt will make his 2012 MLB debut by starting Friday night against Colorado.

Oswalt, who signed a Minor League deal with Texas on May 29, had a 5.87 ERA in four tune-up starts between Round Rock and Double-A Frisco, but Rangers manager Ron Washington wasn’t overly concerned about those stats.

"He's ready to go," Washington told the team's official website. "That's what we brought him for, to bring him to the big leagues, and he's ready. We challenge him now."

Oswalt is 8-2 with a 1.94 ERA in 12 career starts against the Rockies, and is ready to help the Rangers attempt to reach their third straight World Series.

"I'm looking forward to it. I'm hoping to help get this team back in the playoffs and push them through the last game," Oswalt said.

To make room for Oswalt on the 25-man roster, the Rangers placed first baseman Mitch Moreland on the 15-day disabled list with a strained hamstring.

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