We’re looking at the highest and lowest graded performers on defense for the Philadelphia Eagles through the first four games

As a reminder, in PFF's grading scale, 60.0 is the baseline for an "average" grade. 70.0-79.9 is considered above average, 80.0-89.9 is good, whereas 90.0 and higher is elite. On the opposite end of the spectrum, 59.9-50.0 is below average, 49.9-40.0 is considered poor, whereas 39.9 and below is very poor.

Pro Football Focus changed how many fans followed the NFL by providing grades and advanced statistics to help quantify how every player performed on a play-by-play basis from high-profile quarterbacks like Patrick Mahomes to more anonymous guards and linebackers.