The Orioles created room on the 25-man roster for outfielder Xavier Avery by optioning reliever Stu Pomeranz. They made room on the 40-man by designating infielder Matt Antonelli for assignment.
Pomeranz hasn't allowed a run in two appearances covering four innings since the Orioles purchased his contract May 7. He gave up four hits, walked one and struck out three.
The writing was on the wall for Antonelli when the Orioles bypassed him twice for non-roster players Steve Tolleson and Bill Hall. Antonelli, signed as a minor league free agent Nov. 21, is batting .204/.351/.280 with four doubles, one homer and seven RBIs in 29 games at Triple-A Norfolk.
Left-hander Dana Eveland remains with the Orioles, who have to keep checking the health of Jason Hammel and Tommy Hunter.