​The San Francisco 49ers fell to the Tennessee Titans 19-13 at Levi’s Stadium in their preseason opener, but they bounced back this week, defeating the Los Angeles Chargers 41-17 at SoFi Stadium on Thursday.San Francisco should be in win-now mode with the overall age of their roster, so it’s important that their starters and depth players look good heading into the regular season.With two games now behind us, let’s take a look at what the analytics are saying, as Pro Football Focus has graded the 49ers’ best and worst players so far this preseason.Overall PFF grades: Offense (min. 20 snaps)Top 5WR De’Zhaun Stribling – 90.0QB Kurtis Rourke – 76.9WR KhaDarel Hodge – 74.3RB Khalil Herbert – 73.2OL Nick Zakelj – 72.9Bottom 5QB Mac Jones – 51.3OL Enrique Cruz Jr. – 48.1TE Brayden Willis – 41.4QB Adrian Martinez – 39.1OL Robert Jones – 34.1 Overall PFF grades: Defense (min. 20 snaps)Top 5DL Bryson Eason – 83.6CB Jack Jones – 82.8DL James Thompson Jr. – 79.1DE Ogbo Okoronkwo – 77.8LB Tatum Bethune – 75.8Bottom 5DE Romello Height – 47.2S Jalen Stroman – 41.9S Patrick McMorris – 33.4DL Alfred Collins – 30.5LB Garret Wallow – 27.0Pass protection grades (OL only)OL Connor Coby – 80.0OL Nick Zakelj – 76.7OT Colton McKivitz – 76.3C Jake Brendel – 76.3C Doug Kramer – 70.5OT Brandon Parker – 66.6OT Austen Pleasants – 64.7OL Kion Smith – 62.3OL Isaac Alarcon – 53.9OL Enrique Cruz Jr. – 56.7C Drake Nugent – 53.2OL Robert Jones – 13.2Run-blocking grades (OL only)OT Austen Pleasants – 70.7C Jake Brendel – 70.3C Drake Nugent – 69.8OL Nick Zakelj – 68.6C Doug Kramer – 65.9OL Carver Willis – 62.3OL Isaac Alarcon – 54.1OL Connor Colby – 53.6OT Brandon Parker – 52.3OL Robert Jones – 46.9OL Enrique Cruz Jr. – 39.5OT Colton McKivitz – 36.3Pass-rush grades (front-seven only, min. 20 pass-rush snaps)DL James Thompson Jr. – 80.5DE Ogbo Okoronkwo – 74.7DL Sebastian Valdez – 73.3DL Bryson Eason – 72.3LB Quinton Bell – 63.3DE Xavier Thomas – 57.2DL Alfred Collins – 51.3DE Romello Height – 49.7Coverage grades (min. 20 coverage snaps)CB Jack Jones – 88.5S Jaden Dugger -70.7CB Ephesians Prysock – 70.1LB Tatum Bethune – 70.1LB Nick Martin – 69.8S Marques Sigle – 64.5CB Darrell Luter Jr. – 54.4S Ashtyn Davis – 53.2CB Jakob Robinson – 52.6S Jalen Stroman – 45.2S Patrick McMorris – 32.4LB Garret Wallow – 29.1More 49ers: Brock Purdy explains why he already trusts rookie De’Zhaun StriblingThis article originally appeared on Niners Wire: 49ers rising star rookie tops list of team’s best players in preseason