"Knowing the history with Tommy, Tommy has been out as long as two months with this [injury]," Showalter said. "He's had two DL stints that were extended. Like Chris Davis, we are hoping to catch this in the infancy of what could be a lot worse, and try to rectify it in the DL period."
Hunter said he hadn't been hampered by the injury prior to Wednesday, so it's not a reason for his recent struggles on the mound. He converted 10 of his first 11 save opportunities, but blew his last two and his failure to have a clean inning became a concern. Hunter allowed 11 earned runs on 25 hits, five walks and a hit batsman over 16 1/3 innings.
"There's really no excuses for those [games]," Hunter said. "Sorry. That's what everybody is fishing for. I apologize. I can't give you any of those answers."
To take Hunter's spot on the 25-man roster, the Orioles recalled right-hander Preston Guilmet from Triple-A Norfolk. Given that it was an injury situation, the club did not have to wait the required 10-day window to recall Guilmet, who gives the O's another right-handed relief option.
The 26-year-old, who had three days off before throwing 13 pitches on Wednesday, has appeared in two games for the Orioles, striking out three in 1 2/3 scoreless innings. In 15 games for Norfolk, Guilmet was 2-1 with a 4.50 ERA over 18 innings.
Brittany Ghiroli is a reporter for MLB.com. Read her blog, Britt's Bird Watch, and follow her on Twitter @britt_ghiroli. This story was not subject to the approval of Major League Baseball or its clubs.