Seattle's defence made a goal-line stand in the waning seconds on Monday as the Seahawks notched their fourth road win of the NFL season, 14-9 over St Louis.
The Rams and veteran backup quarterback Kellen Clemens - making his 13th career NFL start - launched a drive from their own three-yard line with 5:42 remaining.
Clemens led St Louis to the Seattle one-yard line, where Rams running back Daryl Richardson was stopped on third down, and Clemens then threw an incomplete pass aimed at Brian Quick as time expired.
The Seahawks improved to 7-1, maintaining their lead in the NFC West division over the 6-2 San Francisco 49ers.
The last time the Seahawks posted four wins on the road was in 2006. Their single-season club record for away victories is five, which they achieved in 1984 and 2005.