Rapid Reaction: Dallas Cowboys

What it means: Simply disastrous. The Cowboys know the defense will be limited but the offense can't simply give away games. That's what they did against the 49ers. On the first play of the game, Pro Bowl left tackle Tyron Smith had a false start on his way to a poor outing. On the second snap, Pro Bowl running back DeMarco Murray had a fumble returned 29 yards for a touchdown. Two-time Pro Bowl quarterback Tony Romo was intercepted three times in the first half. All of it led to a 28-3 halftime deficit and effectively sapped the energy out of the home opener. The Cowboys, coming off three straight 8-8 seasons and with expectations extremely low, could not have looked more incompetent.

Stock watch: On more than one occasion in the offseason -- training camp and preseason -- Romo said he believed he would be a better player after undergoing his second back surgery in less than a year. Maybe things will change in the final 15 games, but Sunday was one of Romo's worst. Romo has long felt he needed practice to be at his best, but he was limited in the spring, never practiced more than three straight days in camp and played only 50 official snaps in two preseason games. He was out of sync the entire day and took big hits as well, getting sacked three times. It was the seventh time he has been picked off three times in a half in his career and the first since Week 8 in 2012.

Red-zone woes: When the Cowboys had a chance to keep it close in the first half they imploded in the red zone. On the drive after Murray's fumble, Romo appeared to check out of a running play at the San Francisco 2 and was dropped for a 9-yard sack. The Cowboys settled for a field goal on the drive. On first-and-goal from the 5 in the second quarter, Romo was intercepted in the end zone when he forced a throw to Jason Witten. It wasn't until the second half that the Cowboys ran it inside the 5 and they waited until fourth down to give the ball to Murray, who scored on a 2-yard run with 29 seconds left in the third quarter.

Game ball: DeMarco Murray finished with 118 yards and a touchdown on 22 carries, but his fumble on the opening drive played too big of a part in the loss to earn this honor. Linebacker Rolando McClain, after two retirements and playing his first game since Nov. 25, 2012, when he was with the Oakland Raiders, finished with eight tackles. In a physical game, McClain was able to show up. So there's that.

What's next: The Cowboys travel to Nashville, Tennessee, next week to take on the Tennessee Titans (1-0). It will be the Cowboys' first trip there since 2006. They won, 45-14.