Seahawks Slam the Door, Secure NFC’s Top Seed With Rout of 49ers

Seattle entered Week 18 knowing a statement was needed, and it delivered one of the most authoritative defensive performances of the season to close the regular year. The Seahawks smothered the 49ers, holding them to just three points and 173 total yards in a 13–3 win that sealed home-field advantage throughout the NFC playoffs.

San Francisco had arrived in Seattle on a tear, having scored at least 37 points in each of its previous three games and appearing to peak at the right time. Brock Purdy was in the midst of a prolific stretch, engineering double-digit touchdown totals over the prior two weeks and keeping the 49ers in the thick of the conference race.

Instead, the Seahawks flipped the script with relentless pressure and airtight coverage, producing their most complete defensive outing of the season when it mattered most. By the end of the night, the 49ers looked unrecognizable, forced into short throws, hurried decisions and a rare night of sustained stagnation.

The result not only clinched the NFC’s top seed for Seattle but also underscored a season-long theme: the Seahawks have built the league’s most dependable defense, and it is now the backbone of their postseason ambitions.

1. League’s Most Dominant Defense

Seattle didn’t stumble into the No. 1 seed — it earned it through months of statistical excellence. The Seahawks finished the regular season with a league-best minus-24.2 defensive DVOA, their strongest mark since 2018 and the top figure in the NFL this year. They paired that efficiency with production on the scoreboard, allowing just 17.2 points per game. No defense in football was tougher to crack, and opponents routinely found themselves forced to grind out drives with little margin for error. That narrow margin is what separated Seattle from Houston in the scoring-defense race. The Texans finished just behind at 17.4 points allowed per contest, a razor-thin difference that ultimately went Seattle’s way. Safety Julian Love acknowledged the twist of fate that made it possible, crediting rookie quarterback Riley Leonard for lighting up Houston in Week 18. Leonard’s breakout outing proved pivotal in nudging Seattle ahead in the statistical pecking order.

2. Purdy and the 49ers Brought to a Halt

The Seahawks’ defensive credentials were put to the test against a 49ers offense that had been nearly unstoppable in December. Purdy had thrown 10 touchdowns over his previous two games and looked poised for another shootout. Instead, Seattle swarmed him from the opening drive. The Seahawks recorded three sacks, eight quarterback hits and forced Purdy into a steady stream of uncomfortable throws. By night’s end, Purdy had managed just 127 yards on 19-of-27 passing, failed to throw a touchdown and tossed an interception. For the first time in weeks, San Francisco never found rhythm or momentum. The 49ers were held to 173 total yards, their lowest output of the season, and crossed midfield only sparingly. What had been billed as a clash of titans became a defensive clinic.

3. How the Numbers Tilted Seattle’s Way

The Week 18 math was subtle but significant. Houston finished the year as the NFL’s top defense in total yards allowed at 277.2 per game, narrowly edging Seattle, which ranked sixth at 285.6. But scoring defense is often the metric that defines seasons, and that’s where Seattle made its final push. Leonard’s 30-point outburst against Houston — the first time the Texans had surrendered 30 points all season despite facing elite quarterbacks — tipped the scales. Combined with Seattle’s 13-3 dismantling of San Francisco, it allowed the Seahawks to finish with the NFL’s stingiest points-per-game figure. The juxtaposition of metrics reflects what Seattle has been all year: not necessarily the flashiest defense, but the one most adept at tightening in the red zone and closing games.