San Francisco 49ers linebacker Patrick Willis (52) celebrates with safety Donte Whitner after tackling Arizona Cardinals running back William Powell during the third quarter of an NFL football game in San Francisco, Sunday, Dec. 30, 2012. (AP Photo/Marcio Jose Sanchez)

Associated Press
San Francisco 49ers linebacker Patrick Willis (52) celebrates with safety Donte Whitner after tackling Arizona Cardinals running back William Powell during the third quarter of an NFL football game in San Francisco, Sunday, Dec. 30, 2012. (AP Photo/Marcio Jose Sanchez)
San Francisco 49ers linebacker Patrick Willis (52) celebrates with safety Donte Whitner after tackling Arizona Cardinals running back William Powell during the third quarter of an NFL football game in San Francisco, Sunday, Dec. 30, 2012. (AP Photo/Marcio Jose Sanchez)
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