A U.S. flag is presented on the field at Levi's Stadium as Pat Monahan of the music group Train sings the national anthem before an NFL football game between the San Francisco 49ers and the Chicago Bears in Santa Clara, Calif., Sunday, Sept. 14, 2014. (AP Photo/Noah Berger)

Hall of famers Jerry Rice and Joe Montana are introduced before an NFL football game between the San Francisco 49ers and the Chicago Bears in Santa Clara, Calif., Sunday, Sept. 14, 2014. (AP Photo/Marcio Jose Sanchez)

Chicago Bears tight end Martellus Bennett (83) tries to run from San Francisco 49ers linebacker Patrick Willis, rear, as strong safety Antoine Bethea (41) waits to assist during the first quarter of an NFL football game in Santa Clara, Calif., Sunday, Sept. 14, 2014. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers quarterback Colin Kaepernick (7) passes against the Chicago Bears during the first quarter of an NFL football game in Santa Clara, Calif., Sunday, Sept. 14, 2014. (AP Photo/Tony Avelar)

San Francisco 49ers running back Frank Gore (21) runs as Chicago Bears outside linebacker D.J. Williams (58) dives for him during the first quarter of an NFL football game in Santa Clara, Calif., Sunday, Sept. 14, 2014. (AP Photo/Tony Avelar)

San Francisco 49ers quarterback Colin Kaepernick (7) is tackled by Chicago Bears defensive end Lamarr Houston (99), cornerback Tim Jennings (26) and free safety Ryan Mundy (21) during the first quarter of an NFL football game in Santa Clara, Calif., Sunday, Sept. 14, 2014. (AP Photo/Tony Avelar)

Chicago Bears quarterback Jay Cutler (6) drops back to pass as San Francisco 49ers defensive tackle Justin Smith (94) closes in during the first quarter of an NFL football game in Santa Clara, Calif., Sunday, Sept. 14, 2014. (AP Photo/Tony Avelar)

San Francisco 49ers defensive back Chris Culliver, right, breaks up a pass intended for Chicago Bears wide receiver Alshon Jeffery (17) during the first quarter of an NFL football game in Santa Clara, Calif., Sunday, Sept. 14, 2014. (AP Photo/Tony Avelar)

San Francisco 49ers tight end Vernon Davis (85) is tackled by Chicago Bears cornerback Kyle Fuller during the second quarter of an NFL football game in Santa Clara, Calif., Sunday, Sept. 14, 2014. (AP Photo/Tony Avelar)

Chicago Bears tight end Martellus Bennett (83) cannot catch a pass in front of San Francisco 49ers linebacker Patrick Willis (52) during the second quarter of an NFL football game in Santa Clara, Calif., Sunday, Sept. 14, 2014. (AP Photo/Tony Avelar)

Chicago Bears quarterback Jay Cutler (6) passes against the San Francisco 49ers during the second quarter of an NFL football game in Santa Clara, Calif., Sunday, Sept. 14, 2014. (AP Photo/Tony Avelar)

San Francisco 49ers running back Frank Gore is lifted by teammates after running for an 8-yard touchdown during the second quarter of an NFL football game against the Chicago Bears in Santa Clara, Calif., Sunday, Sept. 14, 2014. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers running back Frank Gore (21) scores on an 8-yard touchdown run past Chicago Bears inside linebacker Jon Bostic (57) during the second quarter of an NFL football game in Santa Clara, Calif., Sunday, Sept. 14, 2014. (AP Photo/Marcio Jose Sanchez)

Chicago Bears wide receiver Brandon Marshall (15) catches a 17-yard touchdown in front of San Francisco 49ers strong safety Jimmie Ward (25) during the second quarter of an NFL football game in Santa Clara, Calif., Sunday, Sept. 14, 2014. (AP Photo/Tony Avelar)

Chicago Bears quarterback Jay Cutler (6) talks with head coach Marc Trestman, right, during the second quarter of an NFL football game against the San Francisco 49ers in Santa Clara, Calif., Sunday, Sept. 14, 2014. (AP Photo/Tony Avelar)

Chicago Bears wide receiver Brandon Marshall (15) celebrates with wide receiver Alshon Jeffery after catching a 17-yard touchdown pass as San Francisco 49ers defensive back Chris Culliver (29) looks on during the second quarter of an NFL football game in Santa Clara, Calif., Sunday, Sept. 14, 2014. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers running back Frank Gore (21) runs past Chicago Bears cornerback Tim Jennings (26) and cornerback Kyle Fuller (23) during the third quarter of an NFL football game in Santa Clara, Calif., Sunday, Sept. 14, 2014. (AP Photo/Marcio Jose Sanchez)

Chicago Bears cornerback Charles Tillman (33) gives a thumbs off as he leaves the field after being injured during the second half of an NFL football game against the San Francisco 49ers in Santa Clara, Calif., Sunday, Sept. 14, 2014. (AP Photo/Tony Avelar)

Chicago Bears wide receiver Brandon Marshall (15) scores on a 5-yard touchdown reception during the fourth quarter of an NFL football game against the San Francisco 49ers in Santa Clara, Calif., Sunday, Sept. 14, 2014. (AP Photo/Tony Avelar)

Chicago Bears wide receiver Brandon Marshall (15) celebrates after catching a 5-yard touchdown during the fourth quarter of an NFL football game against the San Francisco 49ers in Santa Clara, Calif., Sunday, Sept. 14, 2014. (AP Photo/Tony Avelar)

Chicago Bears cornerback Kyle Fuller (23) returns an interception past San Francisco 49ers guard Mike Iupati (77) during the fourth quarter of an NFL football game in Santa Clara, Calif., Sunday, Sept. 14, 2014. (AP Photo/Tony Avelar)

Chicago Bears tight end Martellus Bennett (83) celebrates with wide receiver Alshon Jeffery (17) after catching a 3-yard touchdown reception against the San Francisco 49ers during the fourth quarter of an NFL football game in Santa Clara, Calif., Sunday, Sept. 14, 2014. (AP Photo/Marcio Jose Sanchez)

Chicago Bears cornerback Kyle Fuller (23) falls to the ground in front of San Francisco 49ers guard Daniel Kilgore (67) after intercepting quarterback Colin Kaepernick during the fourth quarter of an NFL football game in Santa Clara, Calif., Sunday, Sept. 14, 2014. (AP Photo/Marcio Jose Sanchez)

Chicago Bears wide receiver Brandon Marshall (15) catches 3-yard touchdown in front of San Francisco 49ers strong safety Jimmie Ward (25) during the fourth quarter of an NFL football game in Santa Clara, Calif., Sunday, Sept. 14, 2014. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers quarterback Colin Kaepernick, left, hugs Chicago Bears quarterback Jay Cutler after an NFL football game in Santa Clara, Calif., Sunday, Sept. 14, 2014. The Bears won 28-20. (AP Photo/Marcio Jose Sanchez)

Chicago Bears head coach Marc Trestman, left, shakes hands with San Francisco 49ers head coach Jim Harbaugh after an NFL football game in Santa Clara, Calif., Sunday, Sept. 14, 2014. The Bears won 28-20. (AP Photo/Tony Avelar)