The San Francisco 49ers took on the Jacksonville Jaguars on Sunday for a Week 4 meeting at Levi’s Stadium, and Kyle Shanahan’s team was handed a 26-21 loss, dropping them to 3-1 and into a three-way tie for the top spot in the NFC West.

San Francisco wasn’t the better team on the field throughout the game, as they constantly turned the ball over and continued their embarrassing streak without an interception or a rushing touchdown through the first four weeks. They’ll need to turn things around quick before they take on the 3-1 Los Angeles Rams on Thursday night.

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As we look through Sunday’s game, let’s take a look at the Pro Football Focus grades to see who they believe were the best and worst 49ers on the field.

Overall PFF grades: Offense (min. 10 snaps)

Top 5

• LT Trent Williams – 78.4

• RT Colton McKivitz – 77.1

• TE Jake Tonges – 75.3

• FB Kyle Juszczyk – 72.2

• WR Demarcus Robinson – 69.5

Bottom 5

• QB Brock Purdy – 61.7

• WR Jauan Jennings – 61.2

• RB Christian McCaffrey – 56.6

• TE Luke Farrell – 52.6

• WR Kendrick Bourne – 37.6

Overall PFF grades: Defense (min. 10 snaps)

Top 5

• LB Fred Warner – 90.9

• DE Yetur Gross-Matos – 76.9

• DE Bryce Huff – 71.7

• LB Luke Gifford – 70.5

• CB Darrell Luter Jr. – 64.6

Bottom 5

• DL Kalia Davis – 54.5

• DE Sam Okuayinonu – 46.9

• DE Mykel Williams – 45.7

• DL Jordan Jefferson – 40.7

• DE Robert Beal Jr. – 39.2

Pass protection grades (OL only)

• RT Colton McKivitz – 75.9

• C Jake Brendel – 74.9

• LT Trent Williams – 69.3

• RG Dominick Puni – 60.5

• LG Connor Colby – 47.7

Run-blocking grades (OL only)

• LT Trent Williams – 82.3

• RT Colton McKivitz – 75.3

• LG Connor Colby – 71.9

• RG Dominick Puni – 67.9

• C Jake Brendel – 64.0

Pass-rush grades (front-seven only, min. 10 pass-rush snaps)

• DE Bryce Huff – 68.7

• DE Yetur Gross-Matos – 67.8

• DL Kalia Davis – 63.9

• DL Alfred Collins – 60.7

• DE Sam Okuayinonu – 58.0

• DL Jordan Elliott – 52.4

• DE Mykel Williams – 51.5

Coverage grades (min. 10 coverage snaps)

• LB Fred Warner – 92.0

• S Jason Pinnock – 65.8

• CB Upton Stout – 58.0

• S Marques Sigle – 57.8

• CB Darrel Luter Jr. – 57.0

• CB Deommodore Lenoir – 55.5

• LB Dee Winters – 46.4

More 49ers: 49ers LB Fred Warner sets new franchise mark, surpassing Hall of Famer

This article originally appeared on Niners Wire: 49ers PFF grades: Best and worst grades from Week 4 loss to Jaguars