SARASOTA, Fla. -- The Orioles held a pair of intrasquad games Wednesday, with each pitcher throwing a frame in the three-inning contests on the back fields of Ed Smith Stadium.

The pitchers who threw were Steve Johnson, Zach Clark, Mike Wright, Todd Redmond, Dylan Bundy, T.J. McFarland, Tommy Hunter, Zach Britton, Adam Russell, Jake Arietta, Brian Matusz and Jair Jurrjens. Minor League callups for the intrasquad games were outfielders Glynn Davis, Brenden Webb and Johnny Ruettiger and infielders Buck Britton, Adrian Marin and Ty Kelly to help fill out the lineups.

Brian Roberts got a nice round of applause when he stepped in the batter's box and drove in Nate McLouth, who doubled, with an RBI single off Britton.

"It's nice," manager Buck Showalter said of Roberts getting a hit in his first at-bat. "I don't think it surprises anybody. I know Zach wasn't too happy about it. The thing about this is if it's someone is hitting well in intrasquad, there's someone on the other side of it. ... There's no way out of it. There were some very good plays in the outfield."

Bundy gave up a leadoff single to Chris Dickerson, who was later picked off by catcher Luis Exposito, and retired the next two batters, while Chris Davis hit an opposite-field homer off Hunter. Matusz looked particularly good in his inning of work, while Manny Machado had a long flyout to the fence.

"I'm not worried about velocity and stuff like that. It's more about guys getting in sync and getting the butterflies out of the way," Showalter said. "You'd like to see -- when we get through tomorrow -- a lot of people get on the mound that need to."

Thursday's intrasquad game will start at 1:05 p.m. ET and be six innings on the main Ed Smith Stadium field, and it's still undecided whether that game will be open to the public. Thursday's pitchers are scheduled to be Mark Hendrickson, Troy Patton, Daniel Schlereth, Eduardo Rodriguez, Chris Tillman, Pedro Strop, Daniel McCutchen, Mike Belfiore and Kevin Gausman.

Acid reflux keeps Markakis out of intrasquad games

SARASOTA, Fla. -- Noticeably absent from Wednesday's pair of intrasquad games was right fielder Nick Markakis, who had the same additional procedure performed that third baseman Manny Machado and pitcher Zach Braddock did earlier this week involving acid reflux.

"When they say that [they have acid reflux in their physical], they follow up on that and find out what they are testing for, if it's acid reflux or an ulcer," manager Buck Showalter explained. "This test tells you what it would be before you medicate it. ... They are trying to eliminate which one it is with all three of those guys. Instead of it being a problem in May or June, let's find out right now what we are dealing with."

Markakis will fly back to Baltimore later Wednesday to attend a funeral, and Showalter said Markakis is expected back on Friday. Both Machado and Braddock missed Tuesday's workout, but they were back with the team on Wednesday and allowed to participate.

Jackson exits workout early with back issues

SARASOTA, Fla. -- Outfielder/first baseman Conor Jackson said Wednesday morning that his sore back is "definitely better" than the previous day, and he will continue to get treatment and rest another day.

Jackson, who left Tuesday's workout, will see how he feels on Thursday. The Orioles played a pair of intrasquad games on Wednesday in advance of Saturday's first Grapefruit League game.

"It's frustrating, to say the least," Jackson, a non-roster invitee, said of dealing with an injury in a new organization. "Obviously you want to make an impression, and it's hard to make an impression when you're not on the field. Just got to treat it until it gets better, and get back out there and play baseball."

Catcher Luis Martinez also left Tuesday's workout early with a strained left oblique that he will continue to get treatment on.