As expected, the Texas Rangers have optioned righthanded reliever Jon Edwards to AAA Round Rock today to make room on the active roster for Stolmy Pimentel.
Pimentel was claimed on waivers by the Pittsburgh Pirates yesterday, but wasn't able to report until today. Edwards was summoned from Round Rock and added to the active roster yesterday to give the Rangers a fresh bullpen arm, but in his outing yesterday, he threw just 9 pitches, walked both batters he faced, and was promptly hooked.
Pimentel is out of options, so if the Rangers decide they want to send him to the minors, he will have to clear waivers. That's what the Pirates were trying to do with him, of course, when the Rangers claimed him.