Montreal was shut out 2-0 on Saturday, stoned by Braden Holtby who stopped all 18 shots fired his way.
Washington won as a +123 underdog, while Over-Under bettors who played UNDER the total of 5.5 were rewarded at the payout window.
Washington got goals from Marco Sturm and Alexander Semin in the victory. Sturm opened the scoring at 1:24 of the first period.
Braden Holtby turned in a 18-save effort for the Capitals.
Carey Price stopped 31 of 33 shots for the Canadiens, but it wasn't enough to earn the victory.
Washington scored 0 times on 4 chances on the power play, while Montreal went 0-for-2 with the man advantage.
Montreal lost the shots on goal battle to Washington by a margin of 33-18.
Washington looks to continue their winning ways next game with a battle against the Hurricanes. The Canadiens will aim to get back on the winning track vs Atlanta.