The Metropolitan Division-leading Capitals are 16-1-0 in their past 17 games against the Atlantic Division-leading Bruins, outscoring them 57-26, and have won eight straight at Boston.
Washington has won two straight overall and is 10-2-0 in its past 12.
Boston will play without captain Zdeno Chara because of a scheduled follow-up procedure for a broken jaw sustained during the Stanley Cup Final. The 42-year-old defenseman is expected to return when the Bruins play at the Buffalo Sabres on Friday, following the three-day NHL Christmas break.
The Bruins are winless in three straight (0-0-3) and are 1-4-4 in their past nine games following an eight-game winning streak.