Dallas Cowboys wide receiver Terrance Williams (83) warms up before an NFL preseason football game against the Baltimore Ravens, Saturday, Aug. 16, 2014, in Arlington, Texas. (AP Photo/Matt Strasen)

Baltimore Ravens quarterback Joe Flacco (5) warms up before an NFL preseason football game against the Dallas Cowboys, Saturday, Aug. 16, 2014, in Arlington, Texas. (AP Photo/Brandon Wade)

Dallas Cowboys quarterback Tony Romo (9) warms up before before an NFL preseason football game against the Baltimore Ravens Saturday, Aug. 16, 2014, in Arlington, Texas. (AP Photo/Brandon Wade)

Baltimore Ravens inside linebacker C.J. Mosley (57) catches a ball before an NFL preseason football game against the Dallas Cowboys, Saturday, Aug. 16, 2014, in Arlington, Texas. (AP Photo/Brandon Wade)

Dallas Cowboys quarterback Tony Romo (9) hands off the ball to running back DeMarco Murray (29) during the first half of an NFL preseason football game against the Baltimore Ravens, Saturday, Aug. 16, 2014, in Arlington, Texas. (AP Photo/Brandon Wade)

Dallas Cowboys' Joseph Randle (21) is tackled by Baltimore Ravens' Lorenzo Taliaferro (34) on a kickoff-return during the first half of an NFL preseason football game Saturday, Aug. 16, 2014, in Arlington, Texas. (AP Photo/Brandon Wade)

Baltimore Ravens outside linebacker Courtney Upshaw, left, runs to the end zone after picking up a fumble by Dallas Cowboys quarterback Tony Romo during the first half of an NFL preseason football game Saturday, Aug. 16, 2014, in Arlington, Texas. (AP Photo/Brandon Wade)

Dallas Cowboys quarterback Tony Romo (9) tries to hold on to Baltimore Ravens outside linebacker Courtney Upshaw, left, as Upshaw picks up a fumble for a touchdown during the first half of an NFL preseason football game Saturday, Aug. 16, 2014, in Arlington, Texas. (AP Photo/Brandon Wade)

Dallas Cowboys wide receiver Dez Bryant (88) makes a touchdown reception during the first half of an NFL preseason football game against the Baltimore Ravens, Saturday, Aug. 16, 2014, in Arlington, Texas. (AP Photo/Matt Strasen)

Dallas Cowboys wide receiver Dez Bryant (88) celebrates after making a touchdown reception against Baltimore Ravens defensive back Dominique Franks (42) during the first half of an NFL preseason football game Saturday, Aug. 16, 2014, in Arlington, Texas. (AP Photo/Matt Strasen)

Dallas Cowboys running back DeMarco Murray (29) is stopped by Baltimore Ravens defensive back Dominique Franks (42), strong safety Darian Stewart (24) and outside linebacker Elvis Dumervil (58) during the first half of an NFL preseason football game Saturday, Aug. 16, 2014, in Arlington, Texas. (AP Photo/Matt Strasen)

Baltimore Ravens wide receiver Deonte Thompson (83) runs with the ball during the first half of an NFL preseason football game against the Dallas Cowboys, Saturday, Aug. 16, 2014, in Arlington, Texas. (AP Photo/Brandon Wade)

Baltimore Ravens quarterback Joe Flacco (5) throws a pass during the first half of an NFL preseason football game against the Dallas Cowboys, Saturday, Aug. 16, 2014, in Arlington, Texas. (AP Photo/Matt Strasen)

Baltimore Ravens running back Ray Rice, left, collides with Dallas Cowboys strong safety J.J. Wilcox during the first half of an NFL preseason football game Saturday, Aug. 16, 2014, in Arlington, Texas. (AP Photo/Brandon Wade)

Dallas Cowboys cornerback Terrance Mitchell (30) tackles Baltimore Ravens tight end Dennis Pitta (88) during the first half of an NFL preseason football game Saturday, Aug. 16, 2014, in Arlington, Texas. (AP Photo/Brandon Wade)

Baltimore Ravens running back Justin Forsett, top, fumbles the ball as he is tackled by Dallas Cowboys linebacker Rolando McClain (55) during the first half of an NFL preseason football game Saturday, Aug. 16, 2014, in Arlington, Texas. The ball was recovered by the Ravens on the play. (AP Photo/Matt Strasen)

Baltimore Ravens quarterback Tyrod Taylor (2) looks for a receiver during the second half of an NFL preseason football game against the Dallas Cowboys, Saturday, Aug. 16, 2014, in Arlington, Texas. (AP Photo/Brandon Wade)

Baltimore Ravens running back Lorenzo Taliaferro (34) scores a touchdown during the second half of an NFL preseason football game against the Dallas Cowboys, Saturday, Aug. 16, 2014, in Arlington, Texas. (AP Photo/Brandon Wade)

Baltimore Ravens running back Lorenzo Taliaferro is stopped by Dallas Cowboys defensive back Tyler Patmon, left, and others during the second half of an NFL preseason football game Saturday, Aug. 16, 2014, in Arlington, Texas. (AP Photo/Matt Strasen)

Dallas Cowboys tight end James Hanna (84) runs to the end zone for a touchdown during the second half of an NFL preseason football game against the Baltimore Ravens, Saturday, Aug. 16, 2014, in Arlington, Texas. (AP Photo/Matt Strasen)

Dallas Cowboys tight end James Hanna (84) celebrates his touchdown with teammates during the second half of an NFL preseason football game against the Baltimore Ravens, Saturday, Aug. 16, 2014, in Arlington, Texas. (AP Photo/Matt Strasen)

Baltimore Ravens' Zach Orr (45) celebrates after tackling Dallas Cowboys' B.W. Webb, lower left, on a kickoff return during the second half of an NFL preseason football game Saturday, Aug. 16, 2014, in Arlington, Texas. (AP Photo/Brandon Wade)

Dallas Cowboys tight end James Hanna (84) makes a catch against Baltimore Ravens defensive back Brynden Trawick (28) and inside linebacker Arthur Brown (59) for a touchdown play during the second half of an NFL preseason football game Saturday, Aug. 16, 2014, in Arlington, Texas. (AP Photo/Brandon Wade)

Dallas Cowboys defensive end Martez Wilson (56) sacks Baltimore Ravens quarterback Tyrod Taylor (2) during the second half of an NFL preseason football game Saturday, Aug. 16, 2014, in Arlington, Texas. (AP Photo/Brandon Wade)

Dallas Cowboys running back Ryan Williams (34) runs into the end zone for a touchdown during the second half of an NFL preseason football game against the Baltimore Ravens, Saturday, Aug. 16, 2014, in Arlington, Texas. (AP Photo/Matt Strasen)

Dallas Cowboys running back Ryan Williams (34) celebrates a touchdown with wide receiver Tim Benford (16) during the second half of an NFL preseason football game against the Baltimore Ravens, Saturday, Aug. 16, 2014, in Arlington, Texas. (AP Photo/Matt Strasen)

Dallas Cowboys wide receiver Jamar Newsome (85) makes a reception against Baltimore Ravens defensive back Deji Olatoye (32) during the second half of an NFL preseason football game Saturday, Aug. 16, 2014, in Arlington, Texas. (AP Photo/Brandon Wade)

Dallas Cowboys wide receiver Jamar Newsome (85) blows a kiss after making a touchdown catch during the second half of an NFL preseason football game against the Baltimore Ravens, Saturday, Aug. 16, 2014, in Arlington, Texas. (AP Photo/Matt Strasen)

Dallas Cowboys wide receiver Dez Bryant (88) reacts after Cowboys wide receiver Jamar Newsome (85) made a touchdown catch during the second half of an NFL preseason football game against the Baltimore Ravens, Saturday, Aug. 16, 2014, in Arlington, Texas. (AP Photo/Matt Strasen)

Baltimore Ravens quarterback Joe Flacco (5) and Dallas Cowboys quarterback Tony Romo (9) talk after an NFL preseason football game Saturday, Aug. 16, 2014, in Arlington, Texas. The Ravens won 37-30. (AP Photo/Brandon Wade)