Receiver Saubert executed the decisive two-point play for the Seahawks.
Seattle engineered a stunning comeback to defeat the Los Angeles Rams in extra time, clinching their spot in the postseason.
Overcoming a sixteen-point deficit in the final period, the Seattle squad emerged victorious by a single point at home, notching their fifth straight victory.
While the Rams had already secured a post-season berth earlier on Sunday, the Seahawks secured their place to the postseason after a two-year hiatus.
With this result, the Seattle now lead their Conference race with a twelve and three record, replacing the Los Angeles, who fell to the fifth seed with an 11-4 record.
Signal-caller Sam Darnold threw two interceptions but recovered to make two scoring throws, including the tying TD to star receiver Smith-Njigba in overtime.
The Rams held a 13-7 advantage at half-time before Kenneth Walker III burst through for a long scoring dash for Seattle.
Rams cornerback Josh Wallace then took back Darnold's initial interception for 56 yards, leading to a short touchdown by Blake Corum on the next play.
In the fourth quarter, a scoring pass from Stafford to Puka Nacua extended the advantage to 30-14, but Rashid Shaheed provided Seattle's comeback with a spectacular return for a score.
Darnold then connected with Barner in the end zone, and a converted two-point play forced the contest into an extra period.
Although Puka Nacua scored for his another TD in overtime, Smith-Njigba answered in kind to set up the game-winning score.
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