Dallas Cowboys quarterback Tony Romo looks for a receiver during the first quarter of a NFL preseason football game against the San Diego Chargers Saturday, Aug. 18, 2012 in San Diego. (AP Photo/Denis Poroy)

Dallas Cowboys running back DeMarco Murray breaks through the defense of the San Diego Chargers after catching a short pass during the first quarter of a NFL preseason football game Saturday, Aug. 18, 2012 in San Diego. The tackle is made by linebacker Donald Butler. (AP Photo/Lenny Ignelzi)

San Diego Chargers quarterback Philip Rivers is sacked by Dallas Cowboys linebacker Victor Butler during the first quarter of a NFL preseason football game Saturday, Aug. 18, 2012 in San Diego. (AP Photo/Chris Park)

Dallas Cowboys linebacker Victor Butler celebrates after sacking San Diego Chargers quarterback Philip Rivers during the first half of a NFL preseason football game Saturday, Aug. 18, 2012 in San Diego. (AP Photo/Chris Park)

Aug 18, 2012; San Diego, CA, USA; Dallas Cowboys quarterback Tony Romo (9) is pressured by San Diego Chargers linebacker Melvin Ingram (54) at Qualcomm Stadium. Mandatory Credit: Kirby Lee/Image of Sport-US PRESSWIRE

Dallas Cowboys running back Jamize Olawale races away from San Diego Chargers linebacker Takeo Spikes during the first half of a NFL preseason football game Saturday, Aug. 18, 2012 in San Diego. (AP Photo/Denis Poroy)

Dallas Cowboys wide receiver Cole Beasley is stripped of the ball by San Diego Chargers linebacker Donald Butler while trying to make a catch during the first half of a NFL preseason football game Saturday, Aug. 18, 2012 in San Diego. Beasley ended up trapping the ball between his knees for a reception. (AP Photo/Chris Park)

Dallas Cowboys running back Felix Jones tries to keep his balance as he slides through the San Diego Chargers defense during the first half of a NFL preseason football game Saturday, Aug. 18, 2012 in San Diego. (AP Photo/Chris Park)

San Diego Chargers wide receiver Vincent Brown is dragged down in the end zone by Dallas Cowboys defensive back Akwasi Owusu-Ansah as Mana Silva sails over during the second half of a NFL preseason football game Saturday, Aug. 18, 2012 in San Diego. Brown was injured on the tackle and had to be carted off the field. (AP Photo/Chris Park)

San Diego Chargers wide receiver Vincent Brown pulls in a touchdown pass as Dallas Cowboys defensive backs Mana Silva and Akwasi Owusu-Ansah arrive late during the second half of a NFL preseason football game Saturday, Aug. 18, 2012 in San Diego. (AP Photo/Denis Poroy)

Dallas Cowboys defensive back Brandon Carr picks off a pass in frint of San Diego Chargers wide receiver Robert Meachem during the first half of a NFL preseason football game Saturday, Aug. 18, 2012 in San Diego. (AP Photo/Denis Poroy)

August 18, 2012; San Diego, CA, USA; San Diego Chargers running back Jackie Battle (44) is tackled after a short gain during the third quarter against the Dallas Cowboys at Qualcomm Stadium. The Chargers won 28-20. Mandatory Credit: Christopher Hanewinckel-US PRESSWIRE

August 18, 2012; San Diego, CA, USA; Dallas Cowboys cornerback Brandon Carr (39) is tackled by San Diego Chargers receiver Vincent Brown (86) after an interception during the second quarter at Qualcomm Stadium. Mandatory Credit: Christopher Hanewinckel-US PRESSWIRE

August 18, 2012; San Diego, CA, Dallas Cowboys quarterback Kyle Orton (18) under center during the second quarter against the San Diego Chargers at Qualcomm Stadium. Mandatory Credit: Christopher Hanewinckel-US PRESSWIRE

August 18, 2012; San Diego, CA, USA; San Diego Chargers quarterback Philip Rivers (17) turns to pitch the ball to running back Curtis Brinkley (36) during the second quarter against the Dallas Cowboys at Qualcomm Stadium. Mandatory Credit: Christopher Hanewinckel-US PRESSWIRE

Aug 18, 2012; San Diego, CA, USA; Dallas Cowboys cornerback Brandon Carr (39) is congratulated by safety Barry Church (42) after intercepting a pass in the second quarter against the San Diego Chargers at Qualcomm Stadium. Mandatory Credit: Kirby Lee/Image of Sport-US PRESSWIRE

Aug 18, 2012; San Diego, CA, USA; San Diego Chargers quarterback Philip Rivers (17) is sacked by Dallas Cowboys linebacker Victor Butler (57) at Qualcomm Stadium. Mandatory Credit: Kirby Lee/Image of Sport-US PRESSWIRE

San Diego Chargers wide receiver Vincent Brown is dragged down in the endxzone by Dallas Cowboys defensive back Akwasi Owusu-Ansah as Mana Silva sails over during the second half of a NFL preseason football game Saturday, Aug. 18, 2012 in San Diego. Brown was injured on the tackle and had to be carted off the field. (AP Photo/Chris Park)

Dallas Cowboys quarterback Kyle Orton during the second half of a NFL preseason football game against the San Diego Chargers Saturday, Aug. 18, 2012 in San Diego. (AP Photo/Chris Park)

San Diego Chargers running back Curtis Brinkley runs aagin st the Dallas Cowboys during the second half of a NFL preseason football game Saturday, Aug. 18, 2012 in San Diego. (AP Photo/Chris Park)

Dallas Cowboys running back Felix Jones tries to keep his balance as he slides through the San Diego Chargers defense during the first half of a NFL preseason football game Saturday, Aug. 18, 2012 in San Diego. (AP Photo/Chris Park)

Dallas Cowboys tight end John Phillips and San Diego Chargers linebacker Antwan Barnes move toward a collision during the first half of a NFL preseason football game Saturday, Aug. 18, 2012 in San Diego. (AP Photo/Chris Park)

Dallas Cowboys running back Jamize Olawale races away from San Diego Chargers linebacker Takeo Spikes during the first half of a NFL preseason football game Saturday, Aug. 18, 2012 in San Diego. (AP Photo/Denis Poroy)

San Diego Chargers defensive back Eric Weddle drags down Dallas Cowboys cornerback Teddy Williams during a kickoff return in the first half of a NFL preseason football game Saturday, Aug. 18, 2012 in San Diego. (AP Photo/Chris Park)

Dallas Cowboys defensive back Brandon Carr picks off a pass in front of San Diego Chargers wide receiver Robert Meachem during the first half of a NFL preseason football game Saturday, Aug. 18, 2012 in San Diego. (AP Photo/Chris Park)

Dallas Cowboys quarterback Kyle Orton during the second half of a NFL preseason football game against the San Diego Chargers Saturday, Aug. 18, 2012 in San Diego. (AP Photo/Chris Park)

Dallas Cowboys tight end James Hanna pulls in a ,pass as San Diego Chargers linebacker Jarret Johnson moves in during the first half of a NFL preseason football game Saturday, Aug. 18, 2012 in San Diego. (AP Photo/Denis Poroy)

San Diego Chargers quarterback Philip Rivers gets off a pass against the rush of Dallas Cowboys linebacker Alex Albright during the first half of a NFL preseason football game Saturday, Aug. 18, 2012 in San Diego. (AP Photo/Chris Park)

San Diego Chargers quarterback Philip Rivers is sacked by Dallas Cowboys linebacker Victor Butler during the first quarter of a NFL preseason football game Saturday, Aug. 18, 2012 in San Diego. (AP Photo/Chris Park)

Aug 18, 2012; San Diego, CA, USA; San Diego Chargers quarterback Philip Rivers (17) and Dallas Cowboys quarterback Tony Romo (9) talk after the game at Qualcomm Stadium. The Chargers defeated the Cowboys 28-20. Mandatory Credit: Kirby Lee/Image of Sport-US PRESSWIRE

Aug 18, 2012; San Diego, CA, USA; Dallas Cowboys quarterback Tony Romo (9) is pressured by San Diego Chargers linebacker Melvin Ingram (54) at Qualcomm Stadium. Mandatory Credit: Kirby Lee/Image of Sport-US PRESSWIRE