ARLINGTON, Texas -- DeMarco Murray strolled around left end for 14 yards on his first carry. There wasn't a St. Louis defender near him until the end of a much longer run a few plays later.
The Rams almost looked like they didn't remember what the Dallas running back did to them in their last meeting.
Murray rushed for 175 yards and a touchdown two years after setting a franchise record against St. Louis as a rookie, and Tony Romo threw for three scores in a 31-7 victory Sunday.
The third-year back had 96 yards rushing to 18 for the entire the St. Louis offense at halftime. His 41-yard run two plays into the third quarter gave him his first 100-yard game in more than a year and set up a touchdown for a 24-0 lead.
DeMarcus Ware had two sacks and broke Harvey Martin's 30-year-old franchise record of 114. Then-coach Bill Parcells and owner Jerry Jones used to have fun throwing around bets how many sacks 2005 first-round pick Ware would get.
"I think of it every time I think of his number of sacks," Jones said. "I can't say that it is unexpected because of how hard he works, and his talent level, and his competitiveness."
When the Rams finally started getting defenders around Murray at the line of scrimmage, Romo found him on the outside for a pair of catches on a drive that ended with a 2-yard run by Murray for a 17-0 lead.
Murray went around left end before extending the ball over the goal line right on the pylon, and there was no review. His last 100-yard game was the 2012 opener, and he was coming off a 25-yard performance in a loss at Kansas City.
"I don't know that there was anything that stood out to me, other than it was just the same commitment and drive and work ethic he's shown all year in the offseason and the first two games," Romo said of Murray, who declined to talk to reporters.
Bradford, who finished 29 of 48 for 240 yards, was hit eight more times in addition to the sacks. The Rams didn't get a first down until the second quarter.
"In the first half, we just never got anything going, played behind the chains all day," Bradford said. "Just a very poor performance on our part today."
NOTES: The Cowboys won their first two home games at their new stadium for the first time since it opened in 2009. ... Cowboys WR Miles Austin injured a hamstring and didn't return. Rams backup DE William Hayes, who had been dealing with a hip problem, came out in the first half because of a knee injury.
Copyright 2013 by The Associated Press