Washington is first in the division with 95 points, three more than the Pittsburgh Penguins.
Goalie Philipp Grubauer will make his third consecutive start for the Capitals. Braden Holtby, who sat out the past two games with a lower-body injury, will be the backup.
The Rangers, 12 points behind the Devils for the second wild card into the Stanley Cup Playoffs from the Eastern Conference, will have rookie centers Lias Andersson, 19, and Filip Chytil, 18, in the lineup. They were recalled from Hartford of the American Hockey League on Sunday.
Andersson, the No. 7 pick in the 2017 NHL Draft, will be making his NHL debut.