Green, Nylander and Laich each scored during a four-goal first period for Washington, which beat Ottawa for the second time in four days. The Capitals topped the Senators 8-6 on Saturday.
The Capitals stumbled to a 6-14-1 record at the start before Bruce Boudreau took over for Glen Hanlon as coach. Boudreau has pushed the Capitals to play more aggressively, to forecheck tougher and create scoring chances to spark the once-dormant offense.
Washington has improved to 16-19-5.
MAPLE LEAFS 4, LIGHTNING 3 (SO)
In Toronto, Mats Sundin scored the decisive goal in a shootout to lift the Maple Leafs.