Midterm report card: Perrish Cox

The 49ers signed Perrish Cox this offseason to be the No.4 cornerback. He plays when offenses use four-wide-receiver formations – Tarell Brown and Chris Culliver cover the outside receivers, Carlos Rogers covers one slot receiver and Cox covers the other one.

So far this season, Cox has played 117 snaps, he’s been targeted on 12 passes and he’s given up 11 catches for 133 yards according to Pro Football Focus. He’s also missed three tackles. Cardinals QB John Skelton was 4-for-4 throwing into Cox’s coverage last week.

Through the first eight games, Cox has been a complete liability for the defense when he’s on the field. Luckily for the 49ers, he hasn’t been on the field much. He’s only played about one-fifth of the defensive snaps because opposing offenses haven’t used four-wide-receiver formations often against the 49ers. Expect that to change as the season goes on.

MIDTERM GRADE: F.