ARLINGTON -- Right-handed reliever Tony Barnette was placed on the disabled list Wednesday, one day after exiting the Rangers' series opener against the Astros due to a right shoulder strain.
Barnette, who struck out one in 1 1/3 scoreless innings before leaving in the eighth inning Tuesday, is still awaiting the results of an MRI he underwent Wednesday.
"Unfortunate, sickening feeling any time you watch a player walk off the field," manager Jeff Banister said. "I feel for Tony in this situation, but obviously we'll get the results of the MRI and see where he's at and take the next steps."
Barnette is 2-0 with a 2.39 ERA in 22 relief appearances for the Rangers this season. The first date he would be eligible to return is July 14.

End in sight for 2018 version of Lone Star Series
The Rangers will wrap up their season series against the American League West-foe Astros with a three-game set at Minute Maid Park on July 27-29, meaning all 19 games in the series will have been played by the end of July. Banister said he would like to see those series more spread out throughout the season, especially if there's a race to win the division.
"I think if you polled almost every manager in baseball, that's what they would tell you," Banister said. "You want that opportunity. In [2015], when we won the division, [you want] to be able to go head to head to win the division. There's an element to that; you want to have it in your own hands. You don't want to have it be in somebody else's."
The Rangers were 4-11 this season against the Astros entering Wednesday. Texas also has lost seven straight to Houston, which matches its longest slide vs. the rival in club history. The last time the Rangers lost seven straight to the Astros was in 2014.
Rangers beat
• Left-hander Martin Perez is scheduled to make a rehab start Thursday for Round Rock, his third since landing on the disabled list with nerve inflammation in his right (non-throwing) arm on April 30. Banister said Perez is expected to throw 85-90 pitches.
• Catcher Carlos Perez will continue his rehab assignment Thursday for Round Rock and is scheduled to catch the aforementioned Martin. Carlos has been on the DL since June 16 due to a right ankle sprain.
• Adrian Beltre was scratched from Wednesday's lineup due to an infected tooth. He was originally in the lineup at third base and batting fourth. Jurickson Profar was moved from second base to third, and he took Beltre's spot in the order. Rougned Odor, who originally had the day off, was placed in the lineup at second base and batted fifth.