OXNARD, Calif. — After three years of watching, Tony Romo is proving he has learned what it takes to play quarterback for the Dallas Cowboys.

Romo took all the snaps for the Cowboys in their preseason opener Saturday night and guided Dallas to a 13-3 victory over the Seattle Seahawks. He completed 19 of 25 passes for 235 yards and a touchdown.

"I'm pleased that we won," Romo said. "That's the bottom line for me."

After a sloppy first series that included two incompletions, Romo completed his next 12 passes. That included a 9-yard touchdown to Patrick Crayton and a scrambling third-down pass to rookie Sam Hurd that had kept the drive going.

"He fumbled two snaps — you can't do that," coach Bill Parcells said. "Other than that, I thought he got us out of some trouble. ... I thought he generally managed the game."