Week 4 Lockdown Report: The NFL's best defenders at preventing separation in coverage

• Marlon Humphrey has returned to an elite level: The Ravens star's 77.78% lockdown rate led the NFL in Week 4 as the Baltimore defense clamped the red-hot Bills.

• A tremendous start for Kool-Aid McKinstry: The Saints rookie is second in the NFL in lockdown rate, preventing openings on 69.23% of opportunities.

• Unlock your edge with a PFF+ subscription: Get full access to all our in-season fantasy tools, including weekly rankings, WR/CB matchup charts, weekly projections, the Start-Sit Optimizer and more. Sign up now!

Estimated reading time: 5 minutes

It’s never too early to start preparing for next season, and for PFF, that means looking at ways to improve PFF Premium Stats. And one way we’re looking to enhance the experience is by introducing more data into the mix.

Over the last couple of weeks, we have presented a new metric we’ve coined “Lockdown Percentage,” which identifies The NFL's best defenders at preventing separation in coverage.

Here is how the league's defenders have fared after three weeks of action.

What is lockdown percentage? 

This metric focuses on coverage, measuring how well a defender prevents a receiver from getting open. It excludes plays where the defender intentionally gives up space to protect the first-down marker or limit yards after the catch.

Week 4 lockdown report (min. 10 opportunities)