And then there were . . . two?
USC coaches insist the Trojans quarterback competition remains wide open.
But on Tuesday, after a weekend scrimmage during which Aaron Corp and Matt Barkley each led three scoring drives, Mitch Mustain was the odd man out.
The junior from Arkansas took only one snap during the final two extended team scrimmage drills, including an overtime period.
Mustain acknowledged disappointment.
"Obviously I'd like to keep going," he said. "I've still got two weeks left.
"I don't know if it's an indicator of anything, but the opportunities I do get, I'm going to keep firing."
After reviewing tape of Saturday's scrimmage at the Coliseum, Mustain reiterated he thought he played well.
"I just didn't have quite the opportunity, so I'll take it for what it is and keep going," said Mustain, who completed seven of 10 passes for 42 yards with an interception.