Ravens vs. Lions: 3 things that need to go right

1. Joe Flacco gets back on track. The Lions have the NFL's worst pass defense, giving up 300 passing yards in seven of 12 games this season (and to the likes of Washington's Jason Campbell and Cleveland's Brady Quinn).

2. Ravens keep their focus. The Ravens have resisted overlooking the NFL's downtrodden recently, something they have to continue Sunday. Under coach John Harbaugh, they have won seven of eight games in which they were favored by at least seven points.

3. Stop turning the ball over in the red zone. The Ravens coughed it up twice inside the 20-yard line at Green Bay (a fumble by Ray Rice and an interception by Flacco). Detroit ranks in the middle of the NFL in red-zone defense.