Freshman defensive tackle Christian Tupou causes havoc in the backfield.
John David Booty throws the ball during team drills at Friday's practice.
John David Booty looks to go deep.
USC quarterbacks Mark Sanchez and John David Booty drop back to pass.
Mark Sanchez and Steve Sarkisian hustle from drill to drill during Friday's practice.
USC fullback Stanley Havili having some fun during practice.
Clay Mathews bursts into the backfield as Stanley Havili takes the handoff.
USC freshman quarterback Aaron Corp fires a pass to Stanley Havili.
USC offensive coordinator Steve Sarkisian watches as John David Booty throws a pass during 7-on-7 drills.
David Ausberry makes a leaping grab.
USC freshman wide receiver Ronald Johnson goes high over a defender to make the catch.
Ronald Johnson comes down with the ball.