Eklund won it with a one-timer from the right circle off a pass from Mikael Granlund with Capitals forward Tom Wilson in the penalty box for a high-sticking double minor at 17:43 of the third period.
The Washington Capitals look to match a season-high five-game winning streak on Tuesday night when they host top overall draft pick Macklin Celebrini, Will Smith and the youthful San Jose Sharks.