Stephenson gave Washington a 1-0 lead at 2:50 of the second period. Nic Dowd lofted the puck over the defense, and Stephenson got to it first to score his third goal of the season.
"That was a good play by [Dowd]," Stephenson said. "Just saw he had some time, so just took off and hoping he'd throw it to an area, which he did."
The Capitals thought they had a two-goal lead when Hutton covered Kuznetsov's shot and the puck slid across the goal line, but the referee had blown the play dead.
Late in the period, Holtby skated toward the blue line, slid and swiped a loose puck to prevent a breakaway by Sabres defenseman Rasmus Ristolainen. Holtby then got his stick on the follow-up attempt by Conor Sheary.
"I thought I could get there," Holtby said. "I was thinking I'd kind of have to get down to try and seal the ice and get it out of the blue line there. Once I kind of went to go down, he kind of stopped skating, which was strange. I didn't really see the second guy coming, so after that you just try and do whatever you can to keep it up."