Despite the setback, Anaheim extended its point streak to four games (2-0-2), one shy of its best run of the season, and earned three of four possible standings point in a two-game season series with Washington. The Ducks now sit 20-34-8 for the year and 10-16-2 on home ice.
Trevor Zegras and Troy Terry scored for Anaheim, with Zegras scoring the game-tying goal midway through the period as part of a two-point night. Cam Fowler, Mason McTavish and Kevin Shattenkirk added assists. John Gibson made 36 saves.
Tom Wilson scored twice for Washington, including his third career overtime goal. Martin Fehervary also scored, while Darcy Kuemper earned the win in net with 21 stops.
Washington struck for the night's first goal midway through the first period on just the latest spectacular pass in the career of Nicklas Backstrom. As the Capitals worked the puck to Backstrom near the right point, Fehervary raced to the net on left wing, taking a pass from the veteran center and tucking a wrister past Gibson inside the near post.
A former second-round selection by Washington now in his second full NHL season, Fehervary has points in three of his last four games (1-2=3).
The assist was the 754th of Backstrom's decorated career, third among active players and 45th in NHL history.
With the secondary helper, defenseman Dylan McIlrath collected his sixth career NHL point, his first since the 2016-17 season with Florida.
The Ducks responded five minutes later on their own outstanding individual effort, as Terry showed the puck-handling skills that have established him as one of the game's best danglers. The two-time All-Star winger accepted a pass in the neutral zone and danced around two defenders near the blue line, waiting until the last possible moment, and using the McIlrath as a screen, before lifting a shot over Kuemper's blocker to tie the game.