This has been the year of the backup quarterback, with many starters getting injured and others being benched. Even some of the biggest names at the position have had slow starts to the season, struggling to complete passes under pressure.
The biggest differential between passer rating with a clean pocket versus a pressured one is Pittsburgh Steelers' backup QB Mason Rudolph, who temporarily filled in for Ben Roethlisberger before succumbing to an injury himself. While he does not have the lowest passer rating under pressure, his ability throw accurate passes and make plays with a clean pocket actually works against him slightly in this comparison, since he has an incredible 127.8 rating with no pressure.
Often criticized for his inconsistency in Chicago is Bears' QB Mitchell Trubisky, who has the second-worst passer rating differential when pressured at -83.7. This also gives him the worst differential among the Week 1 starters on that list.
Another notable name on this list is Dak Prescott of the Dallas Cowboys, who sees a -59.4 passer rating differential when under pressure. This certainly doesn't bode well for a Cowboys' team that has now lost three straight games, especially given Dallas is still dealing with two injured offensive tackles.
Possibly the most surprising name on the list is reigning NFL MVP Patrick Mahomes, who sees a -33.9 reduction in passer rating when there is pressure. An ankle injury may have been a contributing factor with this, but now he has a knee injury, which may limit him even more, if he is able to return this season.
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