Ovechkin, Washington's rookie sensation, scored his 38th goal with 5:07 remaining in the third to spoil Emery's shutout bid. Emery won for the second straight night since taking over for the injured Dominik Hasek.
"He's had to make some stops and he's done it," Senators coach Bryan Murray said. "I can only imagine that as we go forward here he'll feel more comfortable and play pretty well."
Leading 4-0 in Pittsburgh the night before, Ottawa held on to beat the Penguins in its first game following the Olympic break despite having its rookie goalie allow three third-period goals. This time, the Senators gave Emery more than enough offense with seven players scoring goals against Capitals goalies Olaf Kolzig
and Brent Johnson.
"Definitely coming off the break it was good to have those types of games and get the four points that we needed," said Redden, one of eight Senators who played in the Olympics, including Hasek, who is out indefinitely after suffering a groin injury in the Czech Republic's opening game in Torino.
"I just want to play as well as I can each and every night and take it one step at a time," Emery said. "I haven't gotten ahead of myself, I just want to look forward to the next game and let Dom's situation and the rest take care of itself."
Mike Fisher scored the first of six goals against Kolzig 1:04 in. Bryan Smolinski scored Ottawa's seventh goal 5:25 into the third, beating Johnson, who replaced Kolzig after Pothier's third of the season made it 6-0 at 11:40 of the second.
Senators captain Daniel Alfredsson had two assists, and Fisher, Redden, Schaefer and Pothier also had two points.
Washington, which won 5-3 in Toronto on Tuesday night, has lost nine of 12 and is last in the Southeast Division with 45 points.
"In Toronto you could say we created our breaks, and tonight Ottawa created theirs," Capitals coach Glen Hanlon said. "Their speed gave us problems. Our major problem was reading the rush and their defensemen were beating our fourth and fifth guys into the zone all night long.
"That's a good hockey club and we'll likely watch this tape and we'll likely watch Ottawa and we'll use it as a teaching tool for our group. I don't think we can learn too much from our team watching this tape," he said.
Fisher took a long pass from Meszaros and got around defenseman Brendan Witt before beating Kolzig with a backhander to make it 1-0 at 1:04 of the first period.
Redden added a power-play goal at 12:59 and Vermette scored his fourth shorthanded goal of the season 31 seconds into the second to make it 3-0.
Ottawa got its second power-play goal at 2:37 when Spezza took a pass from Alfredsson along the goal line to the left of the net and put a quick shot past Kolzig inside the left post.
Schaefer got credit for the Senators' second shorthanded goal to make it 5-0 at 7:42. A video review confirmed that the puck crossed the goal line before the net was displaced.
Canadian prime minister Stephen Harper attended the game. ... Ovechkin made his Ottawa debut. ... Alfredsson was given a big ovation during a video scoreboard presentation of his Olympic gold medal win with Sweden. ... Pothier's goal, combined with Ottawa's win, triggered a restaurant chain's promotion of a free slice of pizza for everyone in the capacity crowd of 19,346.