Arizona Wildcats ace Nathan Bannister has exited the College World Series game vs. Oklahoma State with an unknown injury after 2.2 innings of hitless ball.
The Wildcats lead the Cowboys 3-0.
If Arizona wins win the game, it will face Oklahoma State again on Saturday for a spot in the College World Series championship series.
Arizona would be eliminated with a loss.
Bannister appeared to be in discomfort after walking a batter with two outs in the third inning and was pulled from the game after visiting with the Wildcats' athletic trainer and coach Jay Johnson.