Given Saturday's doubleheader, which drained the bullpen, and the two deadline trades, the Orioles were forced to make several moves Sunday.
They put Davis on the roster, added lefty relievers Pedro Viola and Mike Ballard from Double-A Bowie and sent Jason Berken to Triple-A Norfolk.
Berken, who was 1-2 with a 6.27 ERA in 31 games, was demoted after Saturday's 17-3 loss in which he entered in the first to replace Zach Britton. Berken allowed seven earned runs, including two homers, in 2 2/3 innings.
He had a 2.04 ERA in his previous 15 games since being recalled June 15.
"My stats coming back, since the last time I got sent down, were pretty good. So, there's a lot of positives, things to take out of the last six weeks. A lot of good things," Berken said. "[Saturday] night wasn't so good, obviously, but I'm not going to let that dictate or influence the way I think I've been throwing. I feel like I've been throwing pretty good. [Saturday] was a bad outing. It [stinks] getting sent down, but I don't feel sorry for myself."
After Sunday's game, Viola and Ballard were sent back to Bowie without having pitched. That happened to Viola previously this year and to Ballard when he was with Texas. Ballard still has not made his big league debut despite having been called to the majors twice. But at least he got a chance to see Yankee Stadium.
"I grew up a Yankees fan. My dad, that was the only team that was on [TV] when he was a kid, so naturally he was a Yankees fan, and I kind of followed suit," said Ballard, who is from Virginia Beach, Va. "I grew up watching the Yankees, so it is definitely cool. It's kind of a boyhood dream to be here."
The Orioles likely will fill the two open spots on their 25-man roster Tuesday when Hunter is activated and Brad Bergesen is reinstated from the paternity leave list.