Chargers running back Ryan Mathews missed practice Thursday because of an injured left foot, a setback coming on the heels of what coach Norv Turner felt was his best game as a pro. Mathews ran 21 times for 98 yards and two touchdowns, and had four receptions for 51 yards in a victory over the Chiefs. A lack of practice snaps hinders the momentum built on Sunday, but Mathews is confident his foot won't impede his progress.