The upside: Even the worst defeats tend to feature a bright spot or two.
Marshawn Lynch ended two impressive 49ers streaks: 36 games without allowing a 100-yard rusher, and 15 games without allowing a rushing touchdown. Lynch rushed for 83 of his 107 yards in the first half. San Francisco had been allowing 71 yards rushing per game.
Rookie receiver Ricardo Lockette sparked Seattle's opening drive to a touchdown with a 44-yard reception, the longest offensive gain for either team.
Rookie receiver Doug Baldwin scored on a 13-yard reception.
Seattle limited Frank Gore to 3.6 yards per rushing attempt.
Leon Washington gained 24 yards on his lone punt return.
The Seahawks finished with better average starting field position than the 49ers. San Francisco entered the game leading the NFL in field position.
Chris Clemons had three quarterback hits.
The Seahawks limited Alex Smith to 6-of-15 passing for 43 yards in the first half.
Seattle became the first team since Detroit on Oct. 16 to score a first-quarter touchdown against the 49ers. The Seahawks became the third team all season to score more than one red zone touchdown against the 49ers in a game.
Tarvaris Jackson threw no interceptions. The 49ers had thrown at least one pick in all but two games previously this season.
Looking ahead: The Seahawks finish the regular season against the Arizona Cardnials at University of Phoenix Stadium.