Denver Broncos quarterback Peyton Manning drops back to throw during the first quarter of an NFL preseason football game against the San Francisco 49ers, Thursday, Aug. 8, 2013, in San Francisco. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers head coach Jim Harbaugh, left, greets Denver Broncos head coach John Fox, right, at the end of their NFL preseason football game Thursday, Aug. 8, 2013, in San Francisco. Denver won the game 10-6. (AP Photo/Marcio Jose Sanchez)

From left, San Francisco 49ers linebacker Aldon Smith, 49ers quarterback Colin Kaepernick, and Denver Broncos outside linebacker Von Miller talk at the end of their NFL preseason football game Thursday, Aug. 8, 2013, in San Francisco. Denver won the game 10-6. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers quarterback Colin Kaepernick, left, greets Denver Broncos quarterback Peyton Manning, right, at the end of their NFL preseason football game Thursday, Aug. 8, 2013, in San Francisco. Denver won the game 10-6. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers coach Jim Harbaugh stands on the sidelines during the fourth quarter of the 49ers' NFL preseason football game against the Denver Broncos on Thursday, Aug. 8, 2013, in San Francisco. Denver won 10-6. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers tight end Vernon Davis sits on the bench during the fourth quarter of an NFL preseason football game against the Denver Broncos on Thursday, Aug. 8, 2013, in San Francisco. Denver won 10-6. (AP Photo/Marcio Jose Sanchez)

Denver Broncos kicker Matt Prater, left, is congratulated by Virgil Green, right, after kicking a field goal during the fourth quarter of an NFL preseason football game against the San Francisco 49ers on Thursday, Aug. 8, 2013, in San Francisco. Denver won 10-6. (AP Photo/Ben Margot)

Denver Broncos quarterback Brock Osweiler (17) is brought down by San Francisco 49ers linebacker Parys Haralson during the third quarter of an NFL preseason football game on Thursday, Aug. 8, 2013, in San Francisco. (AP Photo/Ben Margot)

Denver Broncos cornerback Omar Bolden, left, misses a pass intended for San Francisco 49ers wide receiver Chad Hall, right, during the third quarter of an NFL preseason football game on Thursday, Aug. 8, 2013, in San Francisco. (AP Photo/Ben Margot)

San Francisco 49ers quarterback Colt McCoy, left, tries to break away from Denver Broncos defensive end Malik Jackson, right, during the second quarter of an NFL preseason football game on Thursday, Aug. 8, 2013, in San Francisco. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers running back LaMichael James, right, is stopped by Denver Broncos safety Duke Ihenacho, left, during the first quarter of an NFL preseason football game on Thursday, Aug. 8, 2013, in San Francisco. (AP Photo/Ben Margot)

Denver Broncos head coach John Fox stands on the sidelines during the second quarter of an NFL preseason football game against the San Francisco 49ers, Thursday, Aug. 8, 2013, in San Francisco. (AP Photo/Ben Margot)

Denver Broncos quarterback Brock Osweiler, right, gets past San Francisco 49ers linebacker Parys Haralson, left, during the second quarter of an NFL preseason football game on Thursday, Aug. 8, 2013, in San Francisco. (AP Photo/Ben Margot)

San Francisco 49ers wide receiver A.J. Jenkins, center, fumbles the ball as Denver Broncos safety Duke Ihenacho, left, makes a tackle and Broncos defensive end Robert Ayers (91) looks on during the second quarter of an NFL preseason football game on Thursday, Aug. 8, 2013, in San Francisco. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers running back LaMichael James, left, runs with the ball while pursued by Denver Broncos cornerback Omar Bolden, bottom, and linebacker Stewart Bradley (55) as linebacker Danny Trevathan (59) watches during the first quarter of an NFL preseason football game on Thursday, Aug. 8, 2013, in San Francisco. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers running back D.J. Harper (36) fumbles the ball while being hit by Denver Broncos linebacker Nate Irving, right, during the second quarter of an NFL preseason football game on Thursday, Aug. 8, 2013, in San Francisco. Broncos' Shaun Phillips recovered the ball for a touchdown. (AP Photo/Ben Margot)

Denver Broncos outside linebacker Shaun Phillips, right, is greeted by teammate Omar Bolden, left, after scoring a touchdown on a fumble recovery during the second quarter of an NFL preseason football game on Thursday, Aug. 8, 2013, in San Francisco. (AP Photo/Ben Margot)

Denver Broncos running back Ronnie Hillman, right, carries the ball as San Francisco 49ers strong safety Craig Dahl, left, pursues during the first quarter of an NFL preseason football game on Thursday, Aug. 8, 2013, in San Francisco. (AP Photo/Ben Margot)

San Francisco 49ers head coach Jim Harbaugh, right, talks with back judge Keith Ferguson (61) during the first quarter of an NFL preseason football game against the Denver Broncos, Thursday, Aug. 8, 2013, in San Francisco. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers quarterback Colin Kaepernick, left, runs with the ball away from Denver Broncos outside linebacker Von Miller, right, during the first quarter of an NFL preseason football game on Thursday, Aug. 8, 2013, in San Francisco. (AP Photo/Ben Margot)

San Francisco 49ers running back LaMichael James, right, is brought down with the ball by Denver Broncos free safety Rahim Moore, left, during the first quarter of an NFL preseason football game on Thursday, Aug. 8, 2013, in San Francisco. (AP Photo/Marcio Jose Sanchez)

Denver Broncos quarterback Peyton Manning, left, talks with San Francisco 49ers wide receiver Austin Collie, right, before an NFL preseason football game on Thursday, Aug. 8, 2013, in San Francisco. (AP Photo/Ben Margot)