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Do underdogs really throw more?
Verdict — Barely — favorites run morePassing volume moves about two plays across the entire spread range, and not even in a straight line. Rushing volume moves nearly twice as much and moves cleanly. The real effect is not that trailing teams throw — it is that leading teams run.
The reasoning is intuitive: a team expected to trail will have to pass to catch up, so its receivers see more volume. The spread is one of the most commonly used inputs in a start-sit decision.
| Pre-game spread | Team-games | Pass plays | Run plays |
|---|---|---|---|
| Favorite by 7+ | 651 | 35.4 | 27.9 |
| Favorite by 3–7 | 753 | 36.1 | 27.1 |
| Within a field goal | 1,630 | 36.4 | 26.1 |
| Underdog by 3–7 | 744 | 37.4 | 24.5 |
| Underdog by 7+ | 644 | 36.0 | 24.2 |
Note the last row of the table. Big underdogs throw less than moderate underdogs — a team down four scores is not running a two-minute drill for sixty minutes, it is emptying the bench. The passing column is not monotonic, which is the tell that the effect is weak.
What this changes. The spread is a reasonable input for a rushing projection and close to useless for a receiving one, which is the opposite of how it is usually applied. Starting a receiver because his team is expected to trail is acting on about one extra pass play spread across five eligible receivers.
How this was measured
Every team-game from 2018 to 2025 with a closing point spread, pass and run plays counted from play-by-play. Buckets are the PRE-GAME spread, so nothing depends on knowing the result.