Why wait until tomorrow when you can announce your roster moves tonight? The Orioles placed Vladimir Guerrero on the 15-day disabled list, retroactive to July 11, and optioned left-hander Pedro Viola to Double-A Bowie. Outfielder Matt Angle and left-hander Troy Patton have been recalled from Triple-A Norfolk and will be in uniform tomorrow afternoon. Patton will be used in long and middle relief. There are no current plans to place him in the rotation.