ST. LOUIS -- Jared Cook's first trip to the end zone was a disaster. He ended up on his backside minus the ball and wondered what happened.
It was an impressive turnaround for the 26-year-old Cook after he fumbled away a potential touchdown in the first quarter.
"I told him when we came back to the sideline, I said, 'Hey bro, be ready. It's coming right back to you,' " Bradford said.
"It would have been easy for him to get down out there. He showed a ton of maturity and confidence."
Zuerlein, one of the Rams' top rookie finds last year, made all four of his field-goal attempts, including a 38-yarder that tied it earlier in the fourth. He made seven field goals from 50 yards or longer last season and had distance to spare on the key kick.
"Basically, I stay calm, swing like I know how and the rest takes care of itself," Zuerlein said. "There's no better feeling.
"I don't even know the distances when I go out there to be honest, I just go out there and try to do my job."
"It's a great way to start the season, of course," said Robert Quinn, who had three sacks and two forced fumbles.
Palmer was 26 for 40 for 327 yards and an interception and Fitzgerald had eight receptions for 80 yards, but none in the fourth quarter.
"We felt like we gave this game away," Fitzgerald said. "In the second half it felt like the drives weren't as sustained and we have to improve on that."
Arizona outgained St. Louis 390 to 366 in total yards but mustered just 67 yards and four first downs in the fourth quarter.
"Obviously, late in the ballgame we've got to make plays on third down, then keep drives alive to win the game," Arians said.
Cook had seven catches for 141 yards and the first multi-touchdown game of his career, with one big blemish.
He fumbled away a potential 55-yarder that would have opened the scoring when rookie Tyrann Mathieu punched the ball free at the 8 and the play resulted in a touchback.
"It took us a while to get it going," Cook said. "It was a good day overall."
Mathieu arrived with a big-play reputation as a third-round draft pick out of LSU, where in two seasons he forced 11 fumbles and recovered eight fumbles with two touchdowns.
Williams scored on his first career interception after Matt Shaughnessy deflected Bradford's pass from the 4.
Bradford was 27 for 38 for 299 yards for the Rams, who leaned on Zuerlein's leg after twice settling for field goals off takeaways deep in Arizona territory.
"Other than the three sacks, I had a pretty good day," Brown said.
Cook began atoning with a 13-yard catch that tied it at 10 with 26 seconds to go in the half, stretching the ball across the pylon while getting shoved out of bounds by Yeremiah Bell. Cook found an open spot in the back of the end zone on a 1-yard catch in the fourth off a nice play-action fake by running back Daryl Richardson, who leaped over the line.
NOTES: Neither team had major injuries to report. Rams OT Rodger Saffold missed time in the second quarter with a left knee injury but returned before halftime. ... Saffold and LT Jake Long both had penalties on St. Louis' opening possession but Bradford did not get sacked. ... Arizona's Andre Roberts also had eight catches for 97 yards. ... The Rams totaled 67 yards rushing on 24 carries, with Richardson getting almost all the work on 20 carries for 63 yards.
Copyright 2013 by The Associated Press