Marchand scored into an empty net at 18:16 of the third period for the 6-3 final and his 700th NHL point, the ninth Bruins player to reach that milestone.
"Against a team like that, big moments changed the game," Washington forward Tom Wilson said. "They have a lot of good players on that side, and through the middle of the game, just got to control the outcome as best you can. I think this time of year you don't want to give them anything, and it felt like there was a couple breakdowns they capitalized on."
NOTES: The Capitals played without defenseman Zdeno Chara, who missed his first game of the season with an undisclosed injury, and then lost defenseman Justin Schultz because of a lower-body injury sustained in the first period. There was no update on Schultz after the game. Chara is day to day. … With an assist on Mantha's goal, Orlov extended his point streak to five games (two goals, three assists). … Bergeron's second goal was the 21,000th in Bruins history. … Boston defenseman Jarred Tinordi, who replaced Jakub Zboril (illness) in the lineup, left the game with a facial injury in the third period.