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Washington Redskins quarterback Robert Griffin III poses for photos with fans before a preseason NFL football game against the Tennessee Titans, Thursday, Aug. 8, 2013, in Nashville, Tenn. (AP Photo/Mark Zaleski) ( Redskins Titans Football )

SAN FRANCISCO, CA - AUGUST 08: Peyton Manning #18 of the Denver Broncos stands on the sidelines during their preseason NFL game against the San Francisco 49ers at Candlestick Park on August 8, 2013 in San Francisco, California. (Photo by Ezra Shaw/Getty Images) ( 175810590 )

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) ( Broncos 49ers Football )

SAN FRANCISCO, CA - AUGUST 08: Colin Kaepernick #7 of the San Francisco 49ers runs onto the field for their preseason NFL game against the Denver Broncos at Candlestick Park on August 8, 2013 in San Francisco, California. (Photo by Ezra Shaw/Getty Images) ( 175810635 )

San Francisco 49ers fan Chris Potter, left, holds his seven-year-old daughter Cailee while tailgating before an NFL preseason football game against the Denver Broncos, Thursday, Aug. 8, 2013, in San Francisco. (AP Photo/Marcio Jose Sanchez) ( Broncos 49ers Football )

Atlanta Falcons fan Charles Moten, of Atlanta, takes photos before the first half of a preseason NFL football game against the Cincinnati Bengals, Thursday, Aug. 8, 2013, in Atlanta. (AP Photo/John Bazemore) ( Bengals Falcons Football )

CLEVELAND, OH - AUGUST 08: Quarterback Brandon Weeden #3 of the Cleveland Browns runs onto the field before the start of their game against the St. Louis Rams at FirstEnergy Stadium on August 8, 2013 in Cleveland, Ohio. (Photo by Matt Sullivan/Getty Images) ( 175810177 )

ATLANTA, GA - AUGUST 08: Steven Jackson #39 of the Atlanta Falcons enters the field during player introductions prior to facing the Cincinnati Bengals at Georgia Dome on August 8, 2013 in Atlanta, Georgia. (Photo by Kevin C. Cox/Getty Images) ( 175810309 )

Baltimore Ravens quarterback Joe Flacco (5) throws a pass to running back Bernard Pierce, right, as Tampa Bay Buccaneers defensive end Da'Quan Bowers (91) moves in during the first quarter an NFL preseason football game Thursday, Aug. 8, 2013, in Tampa, Fla. (AP Photo/Brian Blanco) ( Ravens Buccaneers Football )

Baltimore Ravens running back Bernard Pierce (30) scores on a second-quarter touchdown run after getting past Tampa Bay Buccaneers outside linebacker Jonathan Casillas (52) during an NFL preseason football game Thursday, Aug. 8, 2013, in Tampa, Fla. (AP Photo/Phelan M. Ebenhack) ( Ravens Buccaneers Football )

Atlanta Falcons linebacker Joplo Bartu (59) tackles Cincinnati Bengals tight end Orson Charles (80) during the first half of a preseason NFL football game, Thursday, Aug. 8, 2013, in Atlanta. (AP Photo/David Goldman) ( Bengals Falcons Football )

Cleveland Browns quarterback Jason Campbell (17) is chased by St. Louis Rams' Matt Conrath in the second quarter of a preseason NFL football game, Thursday, Aug. 8, 2013, in Cleveland. (AP Photo/Tony Dejak) ( Rams Browns Football )

CLEVELAND, OH - AUGUST 08: Wide receiver Chris Givens #13 of the St. Louis Rams catches a pass in front of defensive back Trevin Wade #26 of the Cleveland Browns at FirstEnergy Stadium on August 8, 2013 in Cleveland, Ohio. (Photo by Matt Sullivan/Getty Images) ( 175810161 )

Washington Redskins wide receiver Leonard Hankerson (85) flips into the end zone as he scores a touchdown on an 8-yard pass play against the Tennessee Titans in the second quarter of a preseason NFL football game on Thursday, Aug. 8, 2013, in Nashville, Tenn. Titans' Al Afalava (38) and Tommie Campbell (37) defend. (AP Photo/Mark Zaleski) ( APTOPIX Redskins Titans Football )

Washington Redskins wide receiver Leonard Hankerson (85) flips into the end zone as he scores a touchdown on an 8-yard pass play against the Tennessee Titans in the second quarter of a preseason NFL football game on Thursday, Aug. 8, 2013, in Nashville, Tenn. Titans' Al Afalava (38) and Tommie Campbell (37) defend. (AP Photo/Mark Zaleski) ( Redskins Titans Football )

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) ( Broncos 49ers Football )

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) ( Broncos 49ers Football )

San Diego Chargers running back Ryan Mathews sails over the Seattle Seahawks defense for a first down in the first quarter of an NFL preseason football game Thursday, Aug. 8, 2013, in San Diego. (AP Photo/Denis Poroy) ( APTOPIX Seahawks Chargers Football )

San Diego Chargers running back Ryan Mathews sails over the Seattle Seahawks defense to gain a first down in the first quarter of an NFL preseason football game Thursday, Aug. 8, 2013, in San Diego. (AP Photo/Lenny Ignelzi) ( Seahawks Chargers Football )

Cincinnati Bengals safety Tony Dye, left and Cincinnati Bengals cornerback Shaun Prater (38) celebrate Cincinnati Bengals wide receiver Dane Sanzenbacher (11) touchdown after Sanzenbacher ran a 71-yard punt return into the end zone against the Atlanta Falcons during the second half of a preseason NFL football game, Thursday, Aug. 8, 2013, in Atlanta. (AP Photo/David Goldman) ( Bengals Falcons Football )

Baltimore Ravens wide receiver Aaron Mellette (13) pulls in a 21-yard touchdown pass over Tampa Bay Buccaneers defensive back Deveron Carr (33) during the fourth quarter of an NFL preseason football game Thursday, Aug. 8, 2013, in Tampa, Fla. (AP Photo/Phelan M. Ebenhack) ( APTOPIX Ravens Buccaneers Football )