(AP) Russell Wilson threw two touchdown passes, Marshawn Lynch scored twice, Richard Sherman returned a blocked field goal 90 yards for another score and Seattle raced to a 28-6 halftime lead over San Francisco on Sunday night in front of the Seahawks' rocking crowd.
Kaepernick and the 49ers' offense were noticeably rattled by the noise echoing off the walls of CenturyLink Field. San Francisco was forced to take two timeouts and had a delay of game penalty in the first quarter alone as the 49ers struggled to handle the roar of the rabid Seattle fans.
With steady rain and the Seahawks' famous 12th Man making simple communication almost impossible it quickly turned into a miserable night for young San Francisco quarterback Colin Kaepernick and an unhappy 49th birthday for 49ers' coach Jim Harbaugh.
Lynch scored on Seattle's first two possessions, the first on a 24-yard run and the second on a 9-yard reception. It was just the third touchdown catch of Lynch's career.
And just when the 49ers finally pieced together a drive, it quickly went the other way with Red Bryant blocking David Akers' 21-yard field-goal attempt and Sherman scooping up the loose ball and sprinting untouched for a 21-0 lead.
Wilson added a 6-yard TD pass to Anthony McCoy with 1:58 left in the half, giving him 23 scoring passes this season. That moved Wilson into second place for TD passes by a rookie and brought him within three of Peyton Manning's NFL rookie record of 26.
San Francisco failed to gain a yard on its opening possession and Seattle took the field for the first time with great field position. A good return from Leon Washington on the punt and a personal-foul penalty on Tremaine Brock gave the Seahawks the ball at the 49ers 35.
Two plays later, Seattle struck. Wilson completed a pass to Zach Miller for 11 yards, and Lynch ran 24 yards for the touchdown.
On the first play of the Seahawks' next series, Wilson connected with Doug Baldwin for a 46-yard gain on a juggling catch to move back into San Francisco territory. Wilson then connected with Lynch out of the backfield for a 9-yard score. It was Lynch's first receiving touchdown since Nov. 27, 2011, against Washington. It was only the second time this season the 49ers have allowed 14 points in the first quarter.
San Francisco finally mounted its first substantial drive into Seahawks' territory. A personal-foul penalty against Kam Chancellor moved San Francisco into the red zone. A third-down pass from Kaepernick to Michael Crabtree went through Sherman's hands, forcing a field goal try.
San Francisco finally got its first break of the game when a screen pass went through the hands of Robert Turbin into the arms of linebacker Patrick Willis. The interception gave the 49ers the ball at the Seattle 16 line, but the Seahawks held to force Akers' 33-yard field goal that got San Francisco on the board.
After McCoy's touchdown, Kaepernick hit Crabtree on consecutive throws and Randy Moss for 25 yards to move to the Seattle 23 with less than 2 minutes to go in the half. K.J. Wright sacked Kaepernick for a 13-yard loss, and Akers connected on a 54-yard field goal.