The Rangers challenged for goalie interference, saying Sheary initiated contact with Shesterkin, preventing him from be able to stop Gustafsson's shot off the rebound. But they lost the challenge, putting Washington on a power play.
The Capitals didn't score with the man-advantage, but Eller made it 3-0 just 22 seconds after the power play expired by charging down the middle of the zone and beating Shesterkin with a wrist shot to the blocker side from the left hash marks at 19:23.
"Those are big goals," Trouba said. "I thought we could come out in the third and respond a little better. Did not. That was kind of the name of the game for us today, a little bit too sloppy. I think we all know in here that wasn't us tonight, how we want to play."
Sheary blocked Panarin's shot and scored a short-handed empty-net goal from the defensive zone at 16:58 of the third period to make it 4-0.
"Disappointing," Gallant said. "Really disappointed in our group tonight. Played soft. We didn't finish checks. We were reaching with sticks all the night all over the ice."
NOTES:The Capitals have won six straight road games, tying a team record that was previously achieved twice (Feb. 26-April 1, 1984; Feb. 20-March 16, 2011). … Kuemper picked up his 10th win of the season, matching teammate Charlie Lindgren. The Capitals are the only team in the NHL with two goalies that have at least 10 wins. … Washington defenseman Nick Jensen left the game with 3:03 remaining in the third period after he was hit in the face by the puck. Laviolette said he checked on Jensen after the game and that he is fine. … Trocheck's point streak ended at six games.