Vanecek made his first key stop in the second minute of the contest, denying New York's Zach Parise on a 2-on-1 bid. Washington tightened up considerably thereafter.
The Caps had the only power play of the first, and they put four shots on net but weren't able to add to their lead.
The second period was all Washington, though the score remained the same after 40 minutes of play. The Caps limited the Islanders to a single shot on net at 5-on-5 in the second, and they held a lopsided 17-3 advantage in shot attempts in the middle period.
Vanecek made another of his biggest stops early in the third when he flashed his left pad to thwart Oliver Wahlstrom, who blazed down the middle of the ice with speed and fired from just above the paint. It was the first of eight saves Vanecek made in the third.
The Caps helped Vanecek out with 11 blocked shots on the afternoon, nine of which came in the third period. Four of the nine third-period blocks came in the final two minutes when the Isles were pressing hard for the equalizer, with Varlamov on the bench for a sixth attacker. John Carlson blocked two shots, Garnet Hathaway one and Nicklas Backstrom one during the game's final two minutes, and Backstrom's block ultimately started the scoring play on Ovechkin's empty-netter, which sent the Caps home with two points.
Vanecek played the second half of Washington's most recent game, a 7-3 loss to the Bruins on Monday. That was the first action he had seen since his most recent start, a 3-2 loss to the Kings in Washington on Dec. 19, nearly four weeks ago. In between then and now, Vanecek landed in the COVID-19 protocol.
"I wasn't thinking about that; I want to help the team," says Vanecek. "I know we lost four in a row, and I tried to help the team win the game. I knew it would be a little bit harder with the breathing, but it wasn't too bad."