Braden Holtby turned aside all 27 shots he faced and pulled into a tie alongside Montreal's Carey Price and Pittsburgh's Marc-Andre Fleury with an NHL-best ninth shutout of the season, and Washington topped Boston by a 3-0 count on Wednesday at Verizon Center.
Holtby finished the year blanking the Bruins three times, stopping 88-of-88 shots in that span.
Goals from John Carlson, Matt Niskanen and Marcus Johansson paced the Caps, who have won five of their last six and reached the 100-point plateau for the first time since 2010-11.
Tuukka Rask made 30 saves for the Bruins, who failed to gain any ground on idle Ottawa and are now tied for the last wild-card spot in the East. Both clubs have 95 points and two games remaining.
Columbus 5, Toronto 0
Dallas 4, Anaheim 0