San Francisco 49ers offensive tackle Anthony Davis, left, blocks Detroit Lions defensive end Cliff Avril, right, in the first quarter of an NFL football game in Detroit, Sunday, Oct. 16, 2011. The 49ers haven't lost to the Lions in more than 15 years.
San Francisco 49ers offensive tackle Anthony Davis, left, blocks Detroit Lions defensive end Cliff Avril, right, in the first quarter of an NFL football game in Detroit, Sunday, Oct. 16, 2011. The 49ers haven't lost to the Lions in more than 15 years. Rick Osentoski AP
San Francisco 49ers offensive tackle Anthony Davis, left, blocks Detroit Lions defensive end Cliff Avril, right, in the first quarter of an NFL football game in Detroit, Sunday, Oct. 16, 2011. The 49ers haven't lost to the Lions in more than 15 years. Rick Osentoski AP