A look at today's 49ers game vs. St. Louis; including, game information, three keys to the game and injury report.

49ERS GAME AT A GLANCE

• Opponent: at St. Louis Rams

• Time: 10 a.m.

• Line: 49ers by 7 1/2

• Records: 49ers 8-2-1, Rams 4-6-1

• TV/Radio: FOX40 (Kenny Albert, Daryl Johnston), 680, 1320

MATCHUP TO WATCH

49ers offensive tackle Anthony Davis vs. Rams defensive end Chris Long

Davis was having a Pro Bowl-worthy season … until he faced nemesis Long on Nov. 11. The Rams defensive end had a sack, two quarterback hits and a tackle for a loss as the Rams sacked Alex Smith and Colin Kaepernick five times in a 24-24 tie. Davis called Long one of the best pass rushers in the game, comparable to Green Bay's Clay Matthews "but with better leverage." Long is second on the Rams with seven sacks. The team's sack leader, left defensive end Robert Quinn (8.5), is questionable this week after suffering a concussion Sunday.

THREE KEYS TO GAME

• Sluggish. That's the word several 49ers used to describe their start in the Nov. 11 game between the teams. The 49ers must have more energy at the beginning of this one.

• The 49ers were penalized 10 times last week, often putting Kaepernick in third-and-long situations. He handled them well but doesn't need the additional hurdle in another loud dome.

• Will the 49ers' special teams be tested after giving up two fake punts in the first meeting? Plus, kicker David Akers is dealing with a pelvis injury, and the team will be without do-everything special teamer, Demarcus Dobbs, who was arrested Friday.

INJURY REPORT

49ERS

• Out: TE-DT Demarcus Dobbs (arrest)

• Questionable: S Darcel McBath (concussion)

• Probable: TE Delanie Walker (hip, ribs), K David Akers (pelvis), LB Aldon Smith (shoulder), CB Tarell Brown (knee), T Anthony Davis (finger), S Dashon Goldson (ribs, calf), LB Tavares Gooden (elbow), RB Frank Gore (wrist, ribs), WR Mario Manningham (shoulder), S Donte Whitner (knee), LB Patrick Willis (shoulder)

RAMS

• Out: LB Mario Haggan (elbow)

• Doubtful: WR Danny Amendola (foot)

• Questionable: DE Robert Quinn (concussion), C Scott Wells (knee), T Barry Richardson (knee)

• Probable: RB Steven Jackson (foot)

– Matthew Barrows

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