One of my favorite aspects of PFF data is the extra context we can add to defensive back play. Sometimes coverage numbers match up perfectly with a player's performance in the secondary, but sometimes the numbers can lie like a cheap watch, and that's where the grading can add layers of context to better reflect what took place.
Was a pass incomplete because of a great play in coverage, or was the defender badly beaten, only to get lucky as the offense couldn't execute the free play?
[Editor's Note: PFF's advanced statistics and player grades are powered by AWS machine learning capabilities.]
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