The Texas Rangers announced Wednesday that Roy Oswalt will make his season debut on Friday against the Colorado Rockies.

The 34-year-old right-hander signed a minor league contract with Texas on May 29 and went 1-1 with a 5.87 ERA in four starts between Triple-A Round Rock and Double-A Frisco.

Oswalt pitched to a 9-10 record with a 3.69 earned run average in 23 starts last season for the Philadelphia Phillies. He spent time on the disabled list on two occasions -- April 27-May 15 and June 24-August 6 -- for inflammation in his lower back.

Friday will be his first MLB appearance since allowing five runs over six innings in a loss to the St. Louis Cardinals in last year's National League Division Series.

Oswalt sports a 159-93 career record with a 3.21 ERA in 339 games (326 starts) with the Houston Astros (2001-10) and Phillies (2010-11).