Suter made it 4-1 at 7:54 of the third period with his second of the game, scoring from a sharp angle with a one-timer that snuck under the right arm of Ersson.
“We made sure we didn't have to play a 200-foot game, and we got the puck deep,” Suter said. “And then really forechecked them hard and got those pucks back, and kept possession. So I think everybody played really well there at the blue line."
Neighbours pushed it to 5-1 with his second of the game at 14:46, tapping in a feed from Buchnevich on the rush.
Less than a minute later, McTavish got his second of the game. His one-timer from the right circle on the power play made it 6-1 at 15:33.
“I don't know if we stopped thinking or what, but you know we didn't help our goaltender," Giroux said. “And you know it wasn't on him in the third. It was on us to play better.”
Jiricek, playing his sixth NHL game, extended it to 7-1 at 16:32, beating Ersson from just above the right circle.
“We're doing the right things and playing, you know, team hockey, so it's good,” Hofer said.
Zetterlund scored on the power play at 18:33 for the 7-2 final.
“Our execution wasn't great, and a few more details,” Ottawa captain Thomas Chabot said. “But you know what? We're aware of it as a team, as a group, as players, and that's all that matters. And we'll make sure we answer back.”
NOTES: Senators forward Ridly Greig did not play the final 9:09 of the game. “He has a strain, so we thought it was best to keep him out,” Green said. … The Blues scored five goals for the second consecutive game; they defeated the Columbus Blue Jackets 5-3 on Saturday. … St. Louis forward Dylan Peterson was plus-1 and played 8:57 in his NHL debut.