Roy Oswalt hopes to join the Rangers after making four minor league tune-up starts. Oswalt, who signed a one-year, $5 million deal with Texas on Tuesday, has been throwing bullpen sessions every other day in an effort to get ready for game action. He's scheduled to make his first minor league tune-up Saturday with Triple-A Round Rock. If all goes well, the veteran right-hander should be ready to join the Rangers in late June.