Backup Iowa State quarterback Phillip Bates has quit the football team and requested a scholarship release from the school, school officials confirmed.
Bates was involved in a tight battle in the spring before he was beaten out for the starting position by Austen Arnaud, who has been the team's starting quarterback for every game in the Cyclones' 2-3 start.
Bates, a sophomore from Omaha, Neb., had played in each of the Cyclones' first four games before sitting out their game last week against Kansas. He was second on the team in rushing with 166 yards and had completed 11 of 24 passes for 137 yards and two touchdowns. He caught five passes as a receiver last season, including a key 38-yard reception that set up the game-winning field goal in the Cyclones' victory over Iowa.
"I am disappointed that Phillip is quitting our team," ISU coach Gene Chizik said. "Although I understand his desire to be a starting quarterback, I am extremely disappointed that he is quitting two days prior to a game. However, we will give him his release, continue to support him academically and honor his scholarship for the rest of the fall semester."
The Cyclones will meet Baylor Saturday in Waco, Texas.
Tim Griffin covers college football for ESPN.com. You may contact him at firstname.lastname@example.org