Cutter Gauthier scored, and John Gibson made 29 saves for Anaheim (10-13-4), which has lost four straight (0-3-1).
“We weren’t skating,” Ducks coach Greg Cronin said. “I mean, they were jumping from the opening face-off, they won face-off battles, they won edge battles, they won puck battles. It’s hard to compete when you’re behind the puck.”
Ottawa was 3-for-5 on the power play; Anaheim was 0-for-5.
“We didn’t have good special teams, but we weren’t good 5-on-5 either,” Cronin said. “I mean, I don’t remember the last game we played it was this bad.”
Ducks forward Leo Carlsson had two hits in 13:35 of ice time in his return after missing six games with an upper-body injury.
“We didn’t execute our passes correctly,” Carlsson said of the team’s performance in the first period. “Us forwards didn’t show up like they did, and that’s how you need to play. Ottawa players just came harder.”
Noah Gregor scored on a pass from Zack Ostapchuk in tight to give the Senators a 1-0 lead at 2:55 of the first period.
“I thought we played strong,” Gregor said of his line with Ostapchuk and Ridly Greig. “We were ready to go right from the jump. We try to just get out there and work hard, play with pace, play competitively, and I thought we did a good job of that tonight.”