Todd Archer ESPN Staff Writer
Left tackle Tyron Smith was one of nine Cowboys not to practice Wednesday. Smith had his back tighten up, but the expectation is he will be able to play Sunday at Atlanta. The bad news is he has had back troubles the last two seasons. Smith has played in every game this season and had his best game last week against Philadelphia. His absence in last year's game against the Falcons' contributed mightily to the eight times Dak Prescott was sacked with four coming against Smith's replacement, Chaz Green.