Roy Oswalt is slated to make his next minor league tuneup Sunday with Triple-A Round Rock. He's slated to throw around 100 pitches. Oswalt has struggled in his first three starts, posting a 7.71 ERA and 8/3 K/BB ratio over 9 1/3 innings. Still, given the injuries in the Rangers' rotation, he could be added to the major league roster next week.