Link: Pro Football Focus
Discovery method: Industry standard football analytics source used in DFS research.
Annotation:
Summary: PFF provides grades, matchup context, and usage information that can explain performance beyond box scores.
Credibility: It is a major football analytics publisher with consistent processes and wide adoption across football media and analysis.
Use in my project: I use PFF to justify player roles, line play edges, coverage matchups, and usage trends that shape ceiling outcomes. This supports decisions on who is truly in a strong position to break a slate.
Limitations: Many features sit behind a paywall, and grades are still a model with judgment baked in.