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NFL 2025 Season Week 18

SEA defeat SF 13-3

SEA defeated SF 13-3. SEA generated +4.4 EPA (+0.069 per play) vs SF's -15.1 EPA (-0.359 per play). The defining moment: B.Purdy intercepted (Q4, 10:27).

By Sportami Editorial

Key Takeaways

  • ⚡
    Turning point: B.Purdy intercepted (Q4, 10:27) turning point
  • ✅
    Key advantage: SEA generated +4.4 EPA (+0.069 per play) vs SF's -15.1 EPA (-0.359 per play) why winner won
  • ❌
    Key failure: SF failed on 7/9 third downs (22% conversion rate) why loser lost
  • ▸
    Game character: one-sided — the winner controlled throughout momentum timeline

SEA defeated SF 13-3. SEA generated +4.4 EPA (+0.069 per play) vs SF's -15.1 EPA (-0.359 per play).

The defining moment: B.Purdy intercepted (Q4, 10:27).

why winner won turning point momentum timeline

⚡ The Turning Point

B.Purdy intercepted (Q4, 10:27). SF's win probability dropped from 25.4% to 9.9% — a 15.5 percentage point swing.

Gave SEA the ball and ended SF's threat while trailing by 10.

turning point

🏈 Drive of the Game

SEA 3-play, 35-yard drive (1:23) ending in touchdown (Q1, 05:52). SEA's win probability moved from 53.4% to 61.4% — a 8.0 percentage point shift over 3 plays.

SEA took the lead for the first time on this drive. Key play (WPA +0.094): (4:37) 26-Z.Charbonnet left tackle for 27 yards, TOUCHDOWN.

drive of game

📈 Game Flow

This was a one-sided affair. The winning team controlled the game from start to finish.

The longest sustained momentum belonged to SEA, who lost 25.2 percentage points of win probability during that stretch. The largest single swing was 15.5 percentage points, caused by a interception.

momentum timeline

✅ Why SEA Won

SEA won 13-3 on the strength of 5 key factors: • SEA generated +4.4 EPA (+0.069 per play) vs SF's -15.1 EPA (-0.359 per play) • SEA passing EPA: +4.8 vs SF: -13.6 • SEA converted 6/12 third downs (50%) vs SF's 2/9 (22%).

why winner won

❌ What Went Wrong for SF

SF lost 3-13. What went wrong: • SF failed on 7/9 third downs (22% conversion rate) • SF generated -15.1 EPA (-0.359 per play) • SF passing attack generated -13.6 EPA.

why loser lost

🏁 The Bottom Line

The drive that defined the game: SEA 3-play, 35-yard drive (1:23) ending in touchdown (Q1, 05:52). The moment that decided it: B.Purdy intercepted (Q4, 10:27).

Final score: SEA 13-3.

why winner won turning point drive of game

Evidence Sources

SEA Play #2875 Drive #3 epa advantage passing advantage third down efficiency third down failures offensive inefficiency passing struggles

Every claim is traced to play-by-play evidence from official NFL data. Powered by Sportami Reason Engine v1.0.