​The San Francisco 49ers were at home again in Week 4, as they hosted the Denver Broncos at Levi’s Stadium on Sunday, and while it was a hard-fought game, Kyle Shanahan’s team walked out with a 24-14 win.San Francisco is 4-0 so far this season and sits alone atop the NFC West after four weeks. Now, in Week 5, they’ll travel North for a division battle with the Seattle Seahawks.Before we completely move on from this game, let’s consult Pro Football Focus and see how they graded some of San Francisco’s best and worst performers from the afternoon.Overall PFF grades: Offense (min. 10 snaps)Top 5WR Mike Evans – 88.9LT Trent Williams – 78.5QB Brock Purdy – 73.1FB Kyle Juszczyk – 68.2RB Kaelon Black – 64.6Bottom 5TE Luke Farrell – 55.2LG Connor Colby – 54.3WR Jordan Watkins – 50.2TE Brayden Willis – 49.4WR Jacob Cowing – 48.4Overall PFF grades: Defense (min. 10 snaps)Top 5S Malik Mustapha – 81.4S Ji’Ayir Brown – 69.8DL Sebastian Valdez – 68.7LB Dre Greenlaw – 68.2CB Renardo Green – 65.4Bottom 5DL Gracen Halton – 49.8LB Jaden Dugger – 49.4DE Keion White – 48.0DL Naquan Jones – 42.6CB Upton Stout – 38.8Pass protection grades (OL only)LT Trent Williams – 85.6C Jake Brendel – 71.6RG Dominick Puni – 68.8RT Colton McKivitz – 64.5LG Connor Colby – 32.1Run-blocking grades (OL only)LT Trent Williams – 71.2LG Connor Colby – 60.0RT Colton McKivitz – 59.5RG Dominick Puni – 59.1C Jake Brendel – 56.8Pass-rush grades (front-seven only, min. 10 pass-rush snaps)DL Osa Odighizuwa – 75.5DE Keion White – 68.2DE Romello Height – 64.8DL Gracen Halton – 61.1DL Sebastian Valdez – 59.7DE Ogbo Okoronkwo – 51.6DE Matthew Judon – 50.1Coverage grades (min. 10 coverage snaps)S Malik Mustapha – 73.7S Ji’Ayir Brown – 73.7CB Renardo Green – 64.6LB Dre Greenlaw – 62.4S Marques Sigle – 55.9CB Deommodore Lenoir – 53.6LB Fred Warner – 52.5CB Upton Stout – 35.5More 49ers: 49ers join rare company with no sacks allowed through four gamesThis article originally appeared on Niners Wire: Best and worst PFF grades from 49ers’ Week 4 victory over Broncos