OTTAWA -- Dominik Hasek didn't care about losing his bid for a shutout. He was more concerned with getting his 300th win.
The 39-year-old Hasek, 4-0 in his first season with Ottawa, is 300-192-82 in 14 seasons with Chicago, Buffalo, Detroit and the Senators. He was working on a shutout until Patrick Leahy jammed in loose puck 3:00 into the third period.
"I'm not disappointed about the shutout," Hasek said. "I was more focused on the win and putting the 300th win behind me. I don't know if we've deserved to win every game but we've always found a way to win and that's what's important."
The Bruins, who opened the season with two losses, had their three-game winning streak snapped.
Just 59 seconds before Leahy scored for the Bruins, Smolinski scored his first goal of the season when his shot from the slot got past Hannu Toivonen to make it 5-0.
Toivonen, who replaced Andrew Raycroft in the second period after the fourth Ottawa goal, made several big stops during the Senators' extended 5-on-3 power play in the third.
Bruins coach Mike Sullivan said he made the switch 13 minutes into the second period to try and and some jump to his team.
"Things weren't going our way and it certainly wasn't a reflection of (Raycroft's) performance," Sullivan said. "I thought we just needed a boost. I thought (Toivonen) did pretty well to be thrown into the fire like that, and against Ottawa who is one of the hottest teams in the league. He's certainly a competitive guy and he battles every minute he's out there."
The Bruins also had a 5-on-3 that lasted 1:40 in the first period, but they never really tested Hasek.
"One of the important things was when it was 0-0 and we killed the 5-on-3 and they didn't score. We scored after and it's always better if you score the first goal," Hasek said.
The Senators finished 1-for-7 on power plays, while Boston was 0-for-5.
Volchenkov got his first goal and first point of the season 13 minutes into the second period to give the Senators a 4-0 lead. Martin Havlat made a nice play on a delayed penalty call to set up the goal. After being hooked, Havlat recovered his balance, spun away from the Bruins defender and delivered a cross-ice backhand pass to Volchenkov whose one-timer beat Raycroft.
A little more than a minute earlier, Bochenski scored the first goal of his NHL career when he banged a loose puck beyond Raycroft who had made two initial stops.
The Senators led 2-0 after the first period on goals by Neil and Vermette less than 4 minutes apart. Neil scored his third of the year as he chipped a shot over a fallen Raycroft while the Senators were on a power play at 11:15.
Vermette scored his second of the season at 15:30 as his snap shot from 30-feet out got over Raycroft's glove.