Carter Hutton made 25 saves for his 10th career shutout as the Blues got goals from Vladimir Sobotka and Vladimir Tarasenko in a 3-0 victory over the struggling Ottawa Senators on Tuesday night.
Brayden Schenn, who also had an assist, added an empty-net goal at 17:34 of the third period. It was his 20th goal of the season.
The game was a bounce-back effort for Hutton, yanked after giving up three goals on 12 shots in Saturday's 5-2 loss to Arizona.
The Blues have earned at least one point in 11 of their last 12 games against Ottawa (7-1-4). St. Louis had lost four straight home games to the Senators before snapping that skid.
The loss was Ottawa's fourth in a row overall.
The Blues' first goal came when Schenn hit Sobotka in stride. Sobotka snapped a wrist shot that defenseman Cody Ceci could not block. The puck hit the skate of Ottawa goalie Craig Anderson, who faced 38 shots in all, and caromed in at 16:21 for a 1-0 lead in the first period.
St. Louis made it 2-0 when Tarasenko ripped a slap shot for his 21st goal at 6:10 of the third.
Tarasenko had just jumped onto the ice when the puck came to him along the boards. Colton Parayko took a shot from the right side that Anderson blocked. The puck slid to Tarasenko, who pounced on it for the goal.
It was Parayko's 20th assist. He is the first defenseman in team history with 20 or more assists in his first three seasons.
Tarasenko has points in six straight games against Ottawa, with five goals and two assists.
A double minor to Robert Bortuzzo for high-sticking gave Ottawa a four-minute power play in the second. The Senators managed just two shots on goal.
The Blues host the Colorado Avalanche on Thursday.