Eric Hurley was supposed to come off the 15-day disabled list to start on Monday against the White Sox, but was a late scratch with a sore throwing arm, so Feldman got the start in his place.
The Rangers expected to move Teagarden back down at some point, and by doing so now, it will allow him to meet the deadline to compete at the 2008 Olympics in Beijing.
"Anytime you get sent down you're disappointed," Teagarden said. "[Manager Ron] Washington talked about how I have a win-win situation. I get to stay here for the rest of the year or just get a once in a lifetime opportunity to be in the Olympics. I think that's the best way to look at it. Obviously, I'd like to stay here a little longer, but I'll go back to Triple-A for about a week or so, and go from there."
Hurley said that he has recovered from the hamstring injury that landed him on the DL on July 8, but felt soreness in his throwing arm while loosening up. Feldman will move back to the bullpen after Monday's start and the rest of the Rangers' rotation will remain as is, with Luis Mendoza and Kevin Millwood making starts in Chicago.
"The doc didn't want him to go out there and favor something," Washington said of Hurley, "so we're just going to push him back one start, that's all. He'll be ready to go his next start. Luckily, we have Feldman."
Feldman is in his third stint with the Rangers this season and is 3-3 with a 5.03 ERA. He's appeared in 16 games -- 14 as a starter. Despite not joining the rotation full-time until May, he is second on the staff in quality starts with eight.
Regardless of his performance Monday night, though, Feldman will return to the bullpen to make way for Hurley's scheduled start Sunday.
David Just is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.