What happened: PFF's Week 2 board slots Patrick Mahomes at 93.3 behind Purdy, with Drew Lock at 90.7, Dak Prescott at 90.1 and Deshaun Watson at 88.8. The order follows a near-flawless Week 2 outing for Purdy that also led Week 2 QBR at 99.7.
Why it matters: Purdy netted positive EPA on 84% of Week 2 plays with a 149.1 passer rating. Mahomes staying within one point keeps the top of the board tight heading into Week 3.
By the numbers: Week 2 QBR: Purdy 99.7.
What to watch: Week 3 will show whether Purdy holds the efficiency lead and whether Lock repeats a top-three grade.