Video, USC offensive line walk-thru at player-run practice, July 18, 2014.
USC's offensive line will perhaps be the most important position group to keep an eye on when the Trojans open fall camp in August.
Tuerk, a third year starter, played his freshman season at left tackle before moving to left guard last season.
Walker will be returning from a season ending ankle injury. He'll have to compete at right guard with redshirt freshman Khaliel Rodgers to earn back his starting role at the position.