Dallas Cowboys running back Marion Barber could not carry a good week of practice into the game against Philadelphia. In the first half, Barber had only two runs for four yards as the Cowboys turned to the single-wing ``Razorback'' for rushing yardage. The first-half performance dropped Barber to a 3.5-yard average for 56 carreis since returning from an injured quadricep muscle. Before the injury, Barber averaged 6.3 yards for 32 carries.