Star-studded Washington is close to relegation in the Stanley Cup playoffs.
The 2018 champion team fell to the New York Islanders 1-2 after extra time and is down 0-3 in the best of seven games.
Matthew Barzal decided after 4.28 in overtime in a free position against Washington goalkeeper Braden Holtby.
Then team captain Anders Lee had given the Islanders the lead in the first period and Washington's Yevgeny Kuznetsov equalized in the second.
Nicklas Bäckström was missing for the second match in a row after being tough tackled by Anders Lee in the first period of the first match. According to the Washington Post, Bäckström is going through the brain ladder that players must follow in case of suspicion of concussion.
The fourth round of 16 is played on Wednesday night.