That's when the 49ers' defense has been at its best, and that's when the 49ers' offense - save two long Frank Gore runs - has been at its worst. Pay particular attention to how the 49ers and Falcons fare tomorrow on first downs. It's vitally important to both teams to get good yardage with their run games on first downs. The Falcons have run the ball 60.3 percent of the time on first downs (averaging just 3.04 yards a carry), while 49ers offensive coordinato...