Four weeks down, one team remains undefeated.

Led by MVP frontrunner Kyler Murray, who completed 24 of 32 passes for 268 yards and two touchdowns, and running back Chase Edmonds who piled up 120 yards on 12 carries, the undefeated Arizona Cardinals rolled to an impressive 37-20 victory over the Rams in Los Angeles.

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The Cardinals haven't won the NFC West or had a winning record since 2015. It appears with Murray now under center, Arizona is a legitimate Super Bowl contender this season. It won’t get any easier when the Cardinals host the San Francisco 49ers on Sunday.

Quite a few teams had impressive showings in Week 4. Some teams remained at the top, but there are a few newcomers in this week’s top 10.

Here are the NFL’s top 10 teams heading into Week 5.

10. Dallas Cowboys

Dallas Cowboys quarterback Dak Prescott (4) and wide receiver Amari Cooper (19) celebrate Cooper's touchdown catch in the second half of an NFL football game against the Carolina Panthers in Arlington, Texas, Sunday, Oct. 3, 2021.

Dallas Cowboys quarterback Dak Prescott (4) and wide receiver Amari Cooper (19) celebrate Cooper's touchdown catch in the second half of an NFL football game against the Carolina Panthers in Arlington, Texas, Sunday, Oct. 3, 2021. ((AP Photo/Michael Ainsworth))

Record: 3-1 

Week 4 result: 36-28 win over Panthers

Outlook: A season-opening loss motivated the Cowboys to win three straight games, including their latest against the No. 1 ranked defense in the NFL. Quarterback Dak Prescott had 188 yards passing with four touchdowns and running back Ezekiel Elliott piled up 143 yards and one score on 23 carries. Next, the Cowboys will host the Giants.

9. Cleveland Browns

Minnesota Vikings running back Alexander Mattison (25) is tackled by Cleveland Browns defensive end Myles Garrett (95) during the second half of an NFL football game, Sunday, Oct. 3, 2021, in Minneapolis.

Minnesota Vikings running back Alexander Mattison (25) is tackled by Cleveland Browns defensive end Myles Garrett (95) during the second half of an NFL football game, Sunday, Oct. 3, 2021, in Minneapolis. ((AP Photo/Bruce Kluckhohn))

Record: 3-1

Week 4 result: 14-7 win over Vikings

Outlook: Myles Garrett and the Browns defense held Vikings quarterback Kirk Cousins and company to only seven points in a 14-7 win. Running back Nick Chubb had 21 carries for 100 yards and led the Browns' attack. As a team, Cleveland had 184 yards on the ground with one score. The Browns will face the Chargers next.

8. Kansas City Chiefs

Kansas City Chiefs quarterback Patrick Mahomes (15) looks to pass during the first half of an NFL football game against the Philadelphia Eagles on Sunday, Oct. 3, 2021, in Philadelphia.

Kansas City Chiefs quarterback Patrick Mahomes (15) looks to pass during the first half of an NFL football game against the Philadelphia Eagles on Sunday, Oct. 3, 2021, in Philadelphia. ((AP Photo/Matt Slocum))

Record: 2-2

Week 4 result: 42-30 win over Eagles

Outlook: After suffering back-to-back losses, the Chiefs came away with a win over the Eagles in Week 4. Patrick Mahomes completed 24 of 30 passes for 278 yards and five touchdowns in the big victory. Wide receiver Tyreek Hill hauled in 11 receptions for 186 yards and three scores. Next up is a showdown with the Bills on Sunday night.

7. Baltimore Ravens

Oct 3, 2021; Denver, Colorado, USA; Baltimore Ravens quarterback Lamar Jackson (8) takes a hike in the second quarter against the Denver Broncos at Empower Field at Mile High.

Oct 3, 2021; Denver, Colorado, USA; Baltimore Ravens quarterback Lamar Jackson (8) takes a hike in the second quarter against the Denver Broncos at Empower Field at Mile High. (Ron Chenoy-USA TODAY Sports)

Record: 3-1

Week 4 result: 23-7 win over Broncos

Outlook: After losing the first game of the season, the Ravens are now on a three-game winning streak after a 23-7 win over Denver. Lamar Jackson threw for 316 and one score and wideout Marquise Brown had four receptions for 91 yards and one score. Baltimore will face the Colts on Monday Night Football in Week 5.

6. Los Angeles Chargers

Quarterback Justin Herbert #10 of the Los Angeles Chargers passes against the Las Vegas Raiders during the first half at SoFi Stadium on October 4, 2021 in Inglewood, California.

Quarterback Justin Herbert #10 of the Los Angeles Chargers passes against the Las Vegas Raiders during the first half at SoFi Stadium on October 4, 2021 in Inglewood, California. (Photo by Sean M. Haffey/Getty Images)

Record: 3-1

Week 4 result: 28-14 win over Raiders

Outlook: Quarterback Justin Herbert completed 25 of 38 passes for 222 yards and three touchdowns and running back Austin Ekeler piled up 15 carries for 117 yards and one score in the Chargers' 28-14 win over the Raiders on Monday Night Football. The Chargers will square off against the Browns in Los Angeles next.

5. Buffalo Bills

Buffalo Bills wide receiver Cole Beasley (11) runs with the ball as Houston Texans running back Scottie Phillips (27) defends during the second half at Highmark Stadium.

Buffalo Bills wide receiver Cole Beasley (11) runs with the ball as Houston Texans running back Scottie Phillips (27) defends during the second half at Highmark Stadium. (Rich Barnes-USA TODAY Sports)

Record: 3-1

Week 4 result: 40-0 win over Texans

Outlook: Josh Allen completed 20 of 30 passes for 248 yards and two scores in Buffalo's shutout victory. As a team, the Bills had 40 carries for 199 yards and two TDs. The Bills will square off against the Chiefs in Kansas City on Sunday Night Football.

4. Green Bay Packers

Green Bay Packers wide receiver Davante Adams (17) catches a pass against Pittsburgh Steelers cornerback Joe Haden (23) in the third quarter at Lambeau Field.

Green Bay Packers wide receiver Davante Adams (17) catches a pass against Pittsburgh Steelers cornerback Joe Haden (23) in the third quarter at Lambeau Field. (Benny Sieu-USA TODAY Sports)

Record: 3-1

Week 4 result: 27-17 win over Steelers

Outlook: Quarterback Aaron Rodgers completed 20 of 36 passes for 248 yards and two touchdowns in Green Bay's big win over the Steelers. Wide receiver Randall Cobb hauled in five receptions for 69 yards and two scores for the Packers. Next, Green Bay travels to Cincinnati to take on the Bengals.

3. Tampa Bay Buccaneers

FOXBOROUGH, MASSACHUSETTS - OCTOBER 03: Tom Brady #12 of the Tampa Bay Buccaneers looks on during the game against the New England Patriots at Gillette Stadium on October 03, 2021 in Foxborough, Massachusetts.

FOXBOROUGH, MASSACHUSETTS - OCTOBER 03: Tom Brady #12 of the Tampa Bay Buccaneers looks on during the game against the New England Patriots at Gillette Stadium on October 03, 2021 in Foxborough, Massachusetts. (Photo by Maddie Meyer/Getty Images)

Record: 3-1

Week 4 result: 19-17 win over Patriots

Outlook: Tom Brady made his return to New England to take on his former club and came out alive with a big victory. The future Hall of Fame quarterback wasn't at his best – he threw for 269 yards and had no touchdowns – but kicker Ryan Succop booted a game-winning 48-yard field goal late in the fourth quarter to lead Tampa Bay. Next up, the Bucs host the Dolphins.

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2. Los Angeles Rams

Sep 26, 2021; Inglewood, California, USA;  Los Angeles Rams defensive end Aaron Donald (99) celebrates after a play in the second half of the game against the Tampa Bay Buccaneers at SoFi Stadium.

Sep 26, 2021; Inglewood, California, USA;  Los Angeles Rams defensive end Aaron Donald (99) celebrates after a play in the second half of the game against the Tampa Bay Buccaneers at SoFi Stadium. (Jayne Kamin-Oncea-USA TODAY Sports)

Record: 3-1

Week 4 result: 37-20 loss to Cardinals

Outlook: The Rams were rolling, but their three-game winning streak to start the season came to an end in Week 4. Quarterback Matt Stafford completed 26 of 41 passes for 280 yards and two touchdowns. Los Angeles will look to regroup against the Seahawks in Seattle on Thursday night.

1. Arizona Cardinals

Arizona Cardinals quarterback Kyler Murray, left, avoids the rush from Los Angeles Rams outside linebacker Leonard Floyd during the first half in an NFL football game Sunday, Oct. 3, 2021, in Inglewood, Calif.

Arizona Cardinals quarterback Kyler Murray, left, avoids the rush from Los Angeles Rams outside linebacker Leonard Floyd during the first half in an NFL football game Sunday, Oct. 3, 2021, in Inglewood, Calif. ((AP Photo/Jae C. Hong))

Record: 4-0

Week 4 result: 37-20 win over Rams

Outlook: Kyler Murray threw for 268 yards and two touchdowns to lead the Cardinals to an impressive road victory. Arizona hasn't won the NFC West or had a winning record since 2015. The Cardinals are proving that they are one of the best teams in all of football.