San Francisco 49ers running back Frank Gore (21) tries to rush past Baltimore Ravens defenders in the second half of an NFL football game in Baltimore, Thursday, Nov. 24, 2011. (AP Photo/Gail Burton)

Baltimore Ravens running back Ricky Williams (34) runs the ball during an NFL football game against the San Francisco 49ers at M&T Bank Stadium in Baltimore, Thursday, Nov. 24, 2011. (Ben Liebenberg/NFL)

Baltimore Ravens running back Ray Rice (27) runs the ball against San Francisco 49ers inside linebacker NaVorro Bowman (53) during an NFL football game at M&T Bank Stadium in Baltimore, Thursday, Nov. 24, 2011. (Ben Liebenberg/NFL)

Baltimore Ravens quarterback Joe Flacco (5) throws to a receiver in the first half of an NFL football game against the San Francisco 49ers in Baltimore, Thursday, Nov. 24, 2011. (AP Photo/Patrick Semansky)

Baltimore Ravens running back Ray Rice (27) rushes against the San Francisco 49ers in the first half of an NFL football game in Baltimore, Thursday, Nov. 24, 2011. (AP Photo/Nick Wass)

Fans hold signs in the stands in the first half of an NFL football game between the Baltimore Ravens and the San Francisco 49ers in Baltimore, Thursday, Nov. 24, 2011. (AP Photo/Gail Burton)

Baltimore Ravens quarterback Joe Flacco (5) looks for a receiver as he is pressured by San Francisco 49ers defenders in the first half of an NFL football game in Baltimore, Thursday, Nov. 24, 2011. (AP Photo/Gail Burton)

San Francisco 49ers quarterback Alex Smith, center, is sacked by Baltimore Ravens defenders in the first half of an NFL football game in Baltimore, Thursday, Nov. 24, 2011. (AP Photo/Gail Burton)

San Francisco 49ers tight end Vernon Davis (85) rushes past Baltimore Ravens inside linebacker Jameel McClain in the first half of an NFL football game in Baltimore, Thursday, Nov. 24, 2011. (AP Photo/Nick Wass)

San Francisco 49ers quarterback Alex Smith (11) looks for a receiver as he is pressured by Baltimore Ravens defenders in the second half of an NFL football game in Baltimore, Thursday, Nov. 24, 2011. (AP Photo/Nick Wass)

San Francisco 49ers quarterback Alex Smith (11) prepares to run a play in the second half of an NFL football game against the Baltimore Ravens in Baltimore, Thursday, Nov. 24, 2011. (AP Photo/Nick Wass)

San Francisco 49ers head coach Jim Harbaugh and Baltimore Ravens head coach John Harbaugh prior to an NFL football game at M&T Bank Stadium in Baltimore, Thursday, Nov. 24, 2011. The Harbaughs became the first brothers to face each other as NFL head coaches. (Ben Liebenberg/NFL)

Baltimore Ravens tight end Ed Dickson (84) tries to outrun San Francisco 49ers inside linebacker Patrick Willis in the second half of an NFL football game in Baltimore on Thursday, Nov. 24, 2011. Baltimore won 16-6. (AP Photo/Nick Wass)

Baltimore Ravens outside linebacker Terrell Suggs (55) reacts after sacking San Francisco 49ers quarterback Alex Smith, bottom left, during the second half of an NFL football game in Baltimore on Thursday, Nov. 24, 2011. Baltimore won 16-6. (AP Photo/Patrick Semansky)

San Francisco 49ers QB Alex Smith during an NFL football game against the Baltimore Ravens at M&T Bank Stadium in Baltimore, Thursday, Nov. 24, 2011. (Ben Liebenberg/NFL)

Baltimore Ravens tight end Dennis Pitta (88) is greeted by teammate Ray Lewis after an NFL football game against the San Francisco 49ers in Baltimore, Thursday, Nov. 24, 2011. Baltimore won 16-6. (AP Photo/Nick Wass)

San Francisco 49ers wide receiver Terrell Owens (81) races Baltimore Ravens linebacker Mike Caldwell (56) during a game at Candlestick Park on Sunday, November 17, 1996. (AP Photo/Al Golub)

San Francisco 49ers guard Ray Brown (65) warns Baltimore Ravens defensive back Stevon Moore (27) during a game at Candlestick Park on Sunday, November 17, 199. (AP Photo/Al Golub)

San Francisco 49ers quarterback Elvis Grbac (18) hands off to full back William Floyd (40) during a game against the Baltimore Ravens at Candlestick Park on Sunday, November 17, 1996. (AP Photo/Al Golub)

San Francisco 49ers running back Terry Kirby (41) in action during a game against the Baltimore Ravens at Candlestick Park on Sunday, November 17, 1996. (AP Photo/Al Golub)

San Francisco 49ers tackle Steve Wallace (74) blocks Baltimore Ravens defensive end Anthony Pleasant (98) to help 49ers quarterback Elvis Grbac (18) during a game at Candlestick Park on Sunday, November 17, 1996. 49ers beat Ravens 38-20. (AP Photo/Al Golub)

Baltimore Ravens Vinnie Testaverde (12) throws a pass during an NFL football game with the San Francisco 49ers on November 17, 1996 at Candlestick Park in San Francisco, California. The 49ers won 38-20. (AP Photo/David Stluka)

San Francisco 49ers running back Maurice Hicks runs against the Baltimore Ravens during the first half on an NFL football game in San Francisco, Sunday, Oct. 7, 2007.(AP Photo/Marcio Jose Sanchez)

Baltimore Ravens wide receiver Derrick Mason, right, makes a reception against the San Francisco 49ers during the second half on an NFL Football game in San Francisco, Sunday, Oct. 7, 2007.(AP Photo/Marcio Jose Sanchez)

Baltimore Ravens quarterback Steve McNair throws downfield against the San Francisco 49ers during the second half on an NFL Football game in San Francisco, Sunday, Oct. 7, 2007. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers safety Mark Roman (26) blocks a pass from Baltimore Ravens quarterback Steve McNair in the third quarter of an NFL football game Sunday, Oct. 7, 2007, in San Francisco. Baltimore won 9-7. (AP Photo/Ben Margot)

Baltimore Ravens running back Willis McGahee (23) is brought down by San Francisco 49ers tackle Aubrayo Franklin (92) in the second quarter of a football game Sunday, Oct. 7, 2007, in San Francisco. (AP Photo/Ben Margot)

Baltimore Ravens wide receiver Derrick Mason, left, has his shirt pulled by San Francisco 49ers cornerback Nate Clements after a reception during the first half on an NFL Football game in San Francisco, Sunday, Oct. 7, 2007.(AP Photo/Marcio Jose Sanchez)

Baltimore Ravens linebacker Adalius Thomas (96) tackles San Francisco 49ers running back Garrison Hearst (20) in the third quarter of the Ravens' 44-6 win Sunday, Nov. 30, 2003, in Baltimore. (AP Photo/Nick Wass)

Baltimore Ravens wide receiver Marcus Robinson, top, makes a 33-yard reception over San Francisco 49ers safety Dwaine Carpenter in the fourth quarter of the Ravens' 44- 6 win Sunday, Nov. 30, 2003, in Baltimore. (AP Photo/Nick Wass)

Baltimore Ravens wide receiver Marcus Robinson (87) celebrates his 38-yard touchdown past San Francisco 49ers cornerbacks Rashad Holman (26) and Ahmed Plummer (29) in the second quarter Sunday, Nov. 30, 2003, in Baltimore. (AP Photo/Nick Wass)

Baltimore Ravens running back Jamal Lewis, left, scores on a 6-yard touchdown run past San Francisco 49ers safety Zack Bronson, right, in the first quarter Sunday, Nov. 30, 2003, in Baltimore. (AP Photo/Nick Wass)