In Week 3 of the season, Dallas beat Washington at home 18-16, as rookie kicker Dan Bailey knocked down six field goals, bailing out an offense that couldn't find the end-zone.
But the emergence of DeMarco Murray in recent weeks has energized the team, allowing them to place less pressure on Tony Romo and a young offensive line and helping them be more efficient in the red zone.
The Cowboys will look to attack the line of scrimmage against a Redskins team which gives up 120.4 yards rushing a game, 18th in the NFL. However, their ground game will look different this week, as RB Felix Jones is expected to play while FB Tony Fiametta is out.
Washington, meanwhile, has flamed out since coming out of their bye in Week 5 at 3-1. The Redskins have lost five straight games while alternating between Rex Grossman and John Beck at QB, neither of whom have done much of anything.
Their rushing attack, averaging only 86.7 yards a game, 31rst in the NFL, hasn't helped either. Tim Hightower, the team's leading rusher, has only 321 yards on the ground this season.
With Washington's offense struggling, the over/under for Sunday's game is only 41.