The Los Angeles Rams duo of Matthew Stafford and Cooper Kupp is taking the league by storm in 2021, but the Bengals' combination of Ja'Marr Chase and Joe Burrow is right behind them and looks set to dominate for the next decade-plus.

PFF's Tej Seth defines three new PFF metrics for plays over expectation.

Using PFF’s Rushing Yards Over Expected to examine the truths and myths about the age and number of carries that lead to NFL running back regression over a player’s career.

The number of box defenders significantly impacts an NFL offense's likely outcomes on passing plays. Yet, the league's top quarterbacks — Patrick Mahomes and Aaron Rodgers among them — make due regardless.

PFF's Wins Over Expected Coaching metric can be used to see how effective an NFL head coach is with their team. Here are the most effective coaches in the league as we look forward to the 2021 season.

Yards after the catch is determined by a variety of factors — not just what the receiver does with the ball in their hands. Now-Carolina Panthers wideout Robby Anderson is one example of a player who saw an uptick in YAC after switching environments.

Kansas City Chiefs quarterback Patrick Mahomes wasn’t the most accurate passer in college or early in his NFL career, but he has improved every season while maintaining elite efficiency and the rest of his special traits.

Running back explosiveness is mostly controlled by the rusher and translates well from college football to the NFL.

Many praised the Chicago Bears for trading up to select Justin Fields in the 2021 NFL Draft, and rightfully so. After displaying innate accuracy at Ohio State, Fields could become the best quarterback in Chicago Bears history.