Per Richard Durrett, Michael Ballard is supposed to get the start tomorrow against the Angles.
Ballard is an organizational depth guy who, presumably, will be DFA'd immediately after tomorrow night's game.
You can check out his numbers here. He's a 24 year old lefty drafted in the 14th round of the 2006 draft. My guess is that he'll clear waivers unclaimed and be outrighted later this week.