Cardinals quarterback Carson Palmer is throwing for a career-high 300 yards and a touchdown on his way to his second straight 100-yard game.
His fourth 200-yard day in as many games, and he had six touchdown passes and no interceptions.
Palmer had a career day for the second time in as few weeks.
With the win, the Cardinals secure their second playoff berth in three seasons and secure home field advantage in the NFC playoff hunt.
Palmer completed 16 of 27 passes for 251 yards and three touchdowns, and it was the best game of his career.
“He’s playing the best football of his life, man,” Cardinals quarterback Drew Stanton said.
“I’ve been a fan of Carson Palmer for a long time.
He’s always been a tremendous player, but to get this win was awesome.”
Palmer’s first 100-yards passing day since 2011 was the longest since Aaron Rodgers threw for 200 yards in Week 10.
The Cardinals (3-2) have won four straight, and their run game was in full effect.
The team scored the first touchdown of the game when Palmer made a 20-yard pass to running back Carlos Hyde for a touchdown.
Palmer also rushed for a TD and had a score on a 14-yard run.
He was sacked once, but Cardinals coach Bruce Arians said Palmer “did a nice job of blocking” the Rams’ defensive backs.
The Rams (3 2) had won their previous two games by a combined score of 37-7.
But they were unable to convert on two third-down plays and a field goal by Jared Goff with less than six minutes left in the first half.
Goff threw for a game-high 163 yards and two touchdowns in his first start for the Rams.
He also completed 11 of 15 passes for 189 yards and four touchdowns.
“We have to play better,” Goff said.
He had four sacks, and the Rams forced six turnovers.
After throwing three interceptions in the opening two quarters, Goff threw three passes in the third quarter.
“That’s one thing we talked about: playing better,” Carson Palmer said.
Palmer said he was “proud” to be a part of the victory.
“It’s not a surprise,” he said.
The game was a great way to kick off a great season for Palmer.
The quarterback said he would continue to be aggressive in his approach.
The Cardinals are one of five undefeated teams in the NFL. “
Hopefully it’s a long day.”
The Cardinals are one of five undefeated teams in the NFL.
They have a 1-0 record in the postseason and have clinched home-field advantage in next month’s playoffs.
The NFC West has been the NFC’s strongest division all season, with the Los Angeles Rams (5-2), Arizona Cardinals (4-2-1) and Seattle Seahawks (5 and 1) all making the playoffs.
“The schedule is tough, but the football is good,” Palmer told reporters after the game.
“Every week we’re playing a good team and they’re playing tough teams, and we have to keep playing.
We’ve got a lot of good football left.”
Palmer completed 21 of 30 passes for 300 yards, one touchdown and one interception in the Cardinals’ win over the Rams in Week 12.
He said he is working to get more accurate in his throws.
“Obviously, I’m working on that a little bit,” Palmer added.
“But I’m going to be out there in practice all week, and hopefully I can keep getting better.”
The Rams have won five straight, including a 23-14 win over Arizona last week.
Palmer was sacked four times and threw a touchdown pass.
The defense allowed six catches for 118 yards and one touchdown.
“Carson Palmer had an amazing day, and that was all you can ask for,” Rams coach Jeff Fisher said.
Arizona leads the NFC West by a point with two games remaining.
The Redskins (2-2; No. 11) have lost five straight and seven of eight.
Washington has lost six of its last seven games and has lost seven straight to Los Angeles.
The offense is coming off back-to-back games that included a 28-24 loss to Philadelphia.
The Cowboys (2 2) won the season opener for the first time in franchise history.
Quarterback Dak Prescott has completed 20 of 32 passes for 277 yards and five touchdowns.
The last time Prescott threw for 300 or more yards was Week 1, against Denver in Week 3.
Prescott’s performance on Monday night helped keep the Cardinals from scoring more than 20 points.
“They kept us from scoring a touchdown,” Prescott said.
Prescott had just three passes for 18 yards in the second half.
Prescott was sacked twice, including twice by Rams safety Rodney McLeod, and threw for another touchdown.
McLeod was credited with a play-action interception that put the Rams up 14-7 at the half. The Bears