1. Tony Romo
Dallas's quarterback can pile up the passing yards -- he's sixth in the league, averaging 318 per game -- but he's also prone to committing crucial turnovers. He has five interceptions and two lost fumbles, and his avoidable mistakes proved costly in losses to the Jets and Lions. It's imperative that the Patriots defense lures Romo into making the inexplicable errors that have prevented him from becoming a truly elite quarterback.