It's official: Roy Oswalt will make his debut for the Texas Rangers on Friday, when the Rangers play host to the Colorado Rockies in an interleague series.

Rangers announce Roy Oswalt will make his first start with Texas on Friday vs. Colorado.

— John Blake (@RangerBlake) June 20, 2012

Oswalt gets the call up to Texas after just four starts in the minors. Oswalt didn't fare particularly well, but, like spring training, results seldom matter when a player is getting ready for the season -- which is what Oswalt was doing.

Oswalt's most recent start came on June 17 for AAA Round Rock. In that start, Oswalt gave up two runs on six hits in six innings, while walking one and striking out five.

Per Jeff Wilson, here's how Texas' rotation will stack up with Oswalt's addition:

#Rangers pick Roy Oswalt to start Friday. Colby Lewis, Matt Harrison, Justin Grimm, Yu Darvish will follow. Scott Feldman back to bullpen.

— Jeff Wilson (@JeffWilson_FWST) June 20, 2012

When Derek Holland is ready to be activated from the disabled list, he'll take Grimm's spot and Grimm will likely head back to the minor leagues.

To discuss this move with Rangers fans, be sure to check out Lone Star Ball and join the discussion.