ARLINGTON -- After a 9-1 loss to the A's on Wednesday, the Rangers designated right-handed reliever Mike Hauschild for assignment and purchased the contract of right-hander Anthony Bass from Triple-A Round Rock on Thursday.
Hauschild allowed five earned runs on seven hits over 3 1/3 innings of relief against the A's. In eight innings over four appearances this year, Hauschild has allowed 14 hits and 10 earned runs, including five home runs.
Because Hauschild was a Rule 5 Draft pick from the Astros system, if he clears waivers, he will be offered back to the Astros for $50,000, or the teams could work out a trade. But with the Rangers needing arms, they made the move to get Bass on the 40-man and 25-man rosters.

"A situation where we needed a pitcher," manager Jeff Banister said. "The situation with Hauschild had become challenging with Rule 5 requirements. However, we felt that was a necessary move to get Bass onto the roster and onto the 25."
This was the first Major League stint for Hauschild, who pitched well early in Spring Training and made a case for a spot in the rotation. But he moved into relief and couldn't get things going.
"We like Mike's stuff," Banister said. "[Wednesday], it went sideways for him. Prior to [Wednesday], you look at the numbers, the exit [velocity], even though he'd given up a couple home runs, the exit velo was low. The consistent opportunities to pitch based on where our games have gone wasn't there for him. After [Wednesday's] game, we were going to need a pitcher, and that's why we had Anthony in Triple-A. A guy we're familiar with, has been in this type of role for us before and was throwing well in Triple-A."
Bass spent last season in Japan and pitched in 33 games for the Rangers in 2015, posting a 4.50 ERA. This year at Round Rock, Bass has allowed two hits in 8 1/3 scoreless innings over three appearances, with 16 strikeouts of 29 batters.
Bass said he could pitch as many as five innings if needed, and felt his previous experience with the club makes things comfortable.
"It's not an easy job to do," he said of long relief. "Often forgot about, but somebody's got to do it. I'm happy to be back and be that guy."
Bass said he learned a lot in Japan, and he hopes to show that.
"I feel like a more confident pitcher," he said. "I've worked on my offspeed pitches more when I was overseas, also pitching effectively inside and when to do that. I definitely feel better than I did before in 2015."
• Left-handed reliever Jake Diekman was in the clubhouse Thursday after the second of three surgeries for ulcerative colitis last week. The final surgery is scheduled for June 9. He's battled the disease since childhood, but has been open about this process. He said he's thrown periodically and is working to get back as soon as possible, but the Rangers won't rush it.
"I have six weeks and four days before surgery," Diekman said. "Three weeks after that, I plan on starting to throw. The doctor doesn't know that. They told me six weeks, but that's not happening. It just depends on how the muscles in my abdomen heal and stuff."