San Francisco is 10-1, with their only loss being to the Seahawks 27-24.
ESPN's Football Power Index has the Ravens at a 67.8% favorite to win.
NFL Team Stats:
Baltimore: 2nd offense, 11th defense
San Fran: 6th offense, 1st defense
Ravens were 2nd overall in DVOA, SF is 3rd.
Baltimore: 1st offense, 4th defense, 2nd special teams
SF: 11th offense, 2nd defense, 10th special teams