What to watch:

• The nation's most interesting quarterback race will play out for Pete Carroll during the spring as junior Mark Sanchez and Arkansas transfer Mitch Mustain will battle to replace John David Booty. Don't be surprised if redshirt freshman Aaron Corp gets a long look, too.
• The most crowded position to watch will be a running back where Joe McKnight, Allen Bradford and Stafon Johnson already are entrenched and C.J. Gable will be coming off a groin injury. Throw in redshirt freshmen Broderick Green and Marc Tyler for good measure in another deep Trojan backfield.
• The Trojans are loaded with defensive talent, but need to find replacements for DE Lawrence Jackson and NT Sedrick Ellis. Christian Tupou and Averell Spicer will be among the challengers for those positions.