Washington's defense, led by netminder Michal Neuvirth, shut down Montreal 3-0 at Bell Centre on on Wednesday.
Washington won as a +130 underdog, while Over-Under bettors who played UNDER the total of 5.5 were rewarded at the payout window.
Washington got goals from Alex Ovechkin, Mathieu Perreault, and Marcus Johansson in the victory. Perreault opened the scoring at 4:41 of the first period.
Michal Neuvirth turned in a 31-save effort for the Capitals.
Carey Price stopped 13 of 16 shots for the Canadiens, but it wasn't enough to earn the victory.
On the power play, Washington went 1-for-4, while the Canadiens were 0-for-7 with the man advantage.
Washington lost the shots on goal battle to Montreal by a margin of 31-16.
Next game, Washington takes its act on the road to face Carolina looking for another win. For Montreal, they head on the road to face Pittsburgh.