Jason Hammel had his MRI on his right knee at 1 p.m. Results aren't known yet, but Showalter said there was no swelling today. The hope is that he can avoid a DL stint; if he can't, the likely call-up would be Brian Matusz, who pitched well in his last start. Matusz is slated to pitch Sunday for Norfolk. Jake Arrieta also could be an option, but the Orioles would prefer to let him have some more time with minor league instruction. They'd like to do the same with Matusz, too, but may not have a choice.