The Cowboys' first possession didn't start out very promising.
Dak Prescott took three sacks on the first four plays. But the second sack, which came on third-and-11 and would have gotten the Rams off the field, was negated by a questionable illegal contact penalty on Rams defensive back Quentin Lake.
The 10-play, 75-yard drive ended with an 18-yard pass from Prescott to Jake Ferguson for a red zone touchdown.
The Cowboys entered the game scoring touchdowns on only 39.1 percent of their red zone possessions.
Prescott went 6-of-7 for 77 yards and a touchdown on the opening drive. Lamb caught three passes for 26 yards.