Just ahead of the midpoint of the first, the Caps doubled their lead on their first power play opportunity of the evening. From down low on the right side, Evgeny Kuznetsov patiently surveyed before putting the puck on a tee for John Carlson at center point. Carlson's one-timer beat Allen to make it 2-0 at 9:43.
In the back half of the frame, the Caps extended their lead once again. Called up from AHL Hershey earlier in the day, Mike Sgarbossa and his linemates spent much of the first period buzzing around in Montreal ice. They were doing exactly that when Habs center Cedric Paquette got a hold of the puck and tried to fling it out of the zone on his backhand. The puck hit Sgarbossa in the chest then glanced off a Montreal defender's skate and behind Allen to make it a 3-0 game at 14:29.
Late in the first period, the Canadiens got on the board, ending Ilya Samsonov's shutout streak at 170 minutes and 13 seconds.
After trying and failing twice to exit their end, the Caps turned it over down low and Jake Evans scored on a shot from the slot at 18:46, forcing Washington to settle for a two-goal lead going into the second period.
Washington got that goal back on a pretty passing sequence just ahead of the midpoint of the middle period. Aliaksei Protas won a board battle behind the Montreal net, putting the puck to the front for Alex Ovechkin, who put a backhand feed toward the right point for Carlson. Carlson wound up as if the crank a one-timer, but instead put a perfect slap pass to the left post for Kuznetsov, who tapped it home to make it a 4-1 game at 9:05.
For the second straight period, the Habs cut a three-goal Washington lead to two goals in the penultimate minute of the period.
The Caps lost control of the puck high in the Montreal end, enabling the Habs to come up ice on a 2-on-1 rush with Cole Caufield carrying up the left side. Caufield ripped a shot over the net, but followed up, going toward the opposite post and one-timing the bounce toward the net. Initially, it appeared as though Samsonov made a great save on the play, but video review showed the puck crossed the red line. Caufield's goal made it 4-2 at 18:54.
Once again, Washington responded to restore its three-goal cushion, getting a Tom Wilson goal early in the third off a sublime feed from Ovechkin. The Caps captain carried down the right side and had Wilson on his off wing on a 2-on-1 rush. Everyone in the building thought Ovechkin was going to shoot, so when he fed Wilson for the one-timer, the winger had an empty net and he made it 5-2 at 1:49 of the third.