Michel Picard and Pavol Demitra had some fun at the expense of their former Ottawa teammates.
"That was fun," Picard said. "It's always great when you score against your old team."
Picard scored a career-high five goals in 24 games for Ottawa in 1994-95, and Demitra spent parts of three seasons with the Senators.
"I wanted to show people here that I can play," Demitra said.
Pierre Turgeon, Kelly Chase and Mike Eastwood also scored to help St. Louis end a two-game losing streak.
Radek Bonk, Andreas Johansson and Igor Kravchuk scored for the Senators, coming off a 3-2 loss Wednesday night in Montreal.
"They dominated us in pretty well all areas of the game," Ottawa defenseman Chris Phillips said. "Physically we were ready, but mentally we came out flat."
St. Louis scored three goals in a five-minute span of the first period.
Chase tied it at 1 when he picked off a clearing attempt in the Ottawa zone and slid the puck past Ron Tugnutt at 13:09. Just 34 seconds later, Turgeon scored his first goal of the season on a 2-on-1 break with Craig Conroy.
Picard's first goal made it 3-1 with 2:02 left in the period, and he added scored the second on a wrist shot at 8:39 of the second period.
"We're not that good that we can take night off," Tugnutt said. "We didn't play the way we usually play and it showed."
The Blues entered the game 22nd in the league in penalty killing, but held the Senators to just one power-play goal in 10 chances. That came when Johansson scored off a feed from Alexei Yashin with 2:23 left in the game.
"We have to play with a little more determination," Senators coach Jacques Martin said. "Their defense played very well."
Eastwood added an empty-net goal for St. Louis with less than a minute remaining, and Kravchuk floated a wrist shot past goalie Jamie McLennan with 2.8 seconds left.
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