1. Fourth-quarter magic: Since Tim Tebow took over as starter, four of Denver’s five wins have been by seven points or fewer. The Broncos’ read-option attack doesn’t score enough to blow out teams, so the Vikings should have their chances in the fourth quarter and could use a late-game breakthrough after several narrow losses in the Metrodome.

2. More from Gerhart: Since replacing the injured Adrian Peterson, Toby Gerhart has 61 rushing yards on 24 carries. Gerhart might benefit from a few well-designed screen plays to create running lanes. He has showcased pass-catching ability in the past.

3. A plan for Miller: Offensive coordinator Bill Musgrave will be drawing up max-protection plans for explosive rookie linebacker Von Miller, who has 10.5 sacks. The Broncos like to move around Miller to give the offense different looks. The Vikings will need a collaborative effort to thwart Miller, who’s questionable with a thumb injury.

4. Win in the trenches: The Broncos rushed 51 times in last week’s 16-13 overtime win over San Diego, sometimes out of three-receiver sets. The Vikings pride themselves on stopping the run.

5. A healthy Harvin: Rookie quarterback Christian Ponder will need Percy Harvin more than ever after Michael Jenkins went on injured reserve with a knee injury – assuming Harvin is over his illness. Harvin is the only active Vikings wide receiver with more than 10 catches on the year. Ponder could test the Broncos with a few intermediate-to-deep throws to Harvin.

– Jeremy Fowler