Early in the third, the Avs scored a goal similar to their second one to close within one of the Capitals. Washington's fourth line was in the midst of an offensive zone shift when the Avs gained control of the puck and broke out on an odd-man rush. MacKinnon carried up the gut and beat Grubauer with a top shelf backhander at 4:29 of the third.
Colorado kept coming at the Caps with speed in the third, and Washington was white-knuckling its way through the final frame. The Avs had a power play opportunity in the immediate aftermath of MacKinnon's goal, but Washington's penalty killing outfit kept the Avs at bay, preserving the Caps' one-goal lead into the latter stages of the game.
Grubauer was also at the top of his game, making some key stops as the Avs swarmed the Caps' net in the third. For the first time in 15 games, the Avalanche was able to muster as many as 30 shots in a game.
Colorado seemed to be on the verge of tying the game on a few occasions as time wound down, but the Caps were finally able to relieve the pressure with a Lars Eller empty-netter from the Washington blueline with 1:22 remaining.