Horton and Krejci lead Boston past Washington, 4-1
David Krejci added a goal and two assists, Rich Peverley had a power-play goal and Andrew Ference scored his first of the season on the eve of his 34th birthday for the Bruins, who avenged a frustrating loss against the Capitals earlier this month.
Bruins backup goaltender Anton Khudobin made 32 saves, and Lucic had a career-high three assists.
Marcus Johansson was credited with Washington's goal when the puck caromed into the net off Bruins defenseman Johnny Boychuk.
It was the Capitals' fourth loss in five games.