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Jordan Mason's 55-yard run seals 49ers victory and NFC West division title (0:36)

Jordan Mason broke off a 55 yard run to give the 49ers a 21-13 victory over the Seattle. It was 0: 36.

7:33 AM AST

The 49ers won the division for the first time in 2019.

The site of their two most recent hat-and-T-shirt celebrations has been a house of horrors for them for the past 10 years.

The Niners defeated the Seattle Seahawks 21-13 on Thursday night to win the division. They won the division crown in Seattle.

The Niners improved to 10-4 on the season and claimed their seventh straight victory, their longest winning streak in over a year. The 49ers can finish no lower than the third seed in the playoffs if they win their final two games.

It's the first time in five years that the 49ers have swept the Seahawks.

Without the services of wide receiver Deebo Samuel and quarterback Brock Purdy, the Niners turned to Christian McCaffrey to carry the load.

In the first half, he had 19 touches for 87 yards and a touchdown, the second most touches he has had in an opening half in his career. He finished with 32 touches for 138 scrimmage yards, his fifth game with 100 or more scrimmage yards, making him the second midseason acquisition to hit that number, joining Eric Dickerson, who had six such games in 1987.

The quarterback who was listed as questionable this week and limited in three practices, finished 17-of-26 for 217 yards with two touchdown passes to George Kittle for a passer rating of 118.0.