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FILE - In this Oct. 4, 2008 file photo, Southern California quarterback Mitch Mustain scrambles against Oregon in the fourth quarter of an NCAA college football game in Los Angeles. Sophomore Aaron Corp has emerged as USC's No. 1 quarterback at the end of spring practice. Freshman Matt Barkley will be his backup and junior Mitch Mustain is slotted as the No. 3 QB, although coach Pete Carroll says the competition to replace Mark Sanchez will continue into fall camp. (AP Photo/Mark Avery, File)