St. Louis Rams running back Tre Mason, right, is tackled by San Francisco 49ers inside linebacker Chris Borland (50) during the fourth quarter of an NFL football game in Santa Clara, Calif., Sunday, Nov. 2, 2014.
St. Louis Rams running back Tre Mason, right, is tackled by San Francisco 49ers inside linebacker Chris Borland (50) during the fourth quarter of an NFL football game in Santa Clara, Calif., Sunday, Nov. 2, 2014. Ben Margot AP
St. Louis Rams running back Tre Mason, right, is tackled by San Francisco 49ers inside linebacker Chris Borland (50) during the fourth quarter of an NFL football game in Santa Clara, Calif., Sunday, Nov. 2, 2014. Ben Margot AP