"I'm very excited," Butler said. "It means a lot ... my first start, pretty exciting."
Butler made his Major League debut on Wednesday night when he pinch-hit in the ninth inning against Angels left-hander Nick Maronde. He lined out to second base.
The Rangers have to make a roster move on Saturday to make room for Alex Rios and will likely send either Butler or Engel Beltre back to Round Rock. Butler may be the one staying since he hits right-handed. Rios will play every day in right field, so Butler may end up playing left field instead of David Murphy when there are left-handers on the mound.
"He'll play tonight and then we'll make a decision tomorrow," Rangers manager Ron Washington said.