Tom Wilson scored twice, and Alex Ovechkin scored his 10th goal in his past nine games for Washington (23-7-4), which has won three straight and 10 of 11. Ovechkin has 724 NHL goals, eight from surpassing Marcel Dionne (731) for fifth all time.
T.J. Oshie had a goal and two assists and Evgeny Kuznetsov also scored for Washington. Ilya Samsonov made 16 saves.
"I feel like there's been times throughout the year where we've gotten ourselves in good position going into the third [and] we maybe take our foot off the gas," Oshie said. "We're getting closer to crunch time here, to the end of the year. Protecting leads is going to be very important, so hopefully tonight we can look at some video and learn from tonight and past experiences and grow that part of our game."
Colin Blackwell had his first two-goal game in the NHL for the Rangers (15-15-4), who have lost two straight, including 2-1 to the Flyers on Saturday, after winning three in a row. Keith Kinkaid made 17 saves.
"Obviously coming off the back-to-back, we wanted to keep it simple," Rangers defenseman Adam Fox said. "Some bounces went their way. They were putting pucks on net, and then by the third we started putting pucks there. It's a game of inches and just came up a bit short."