Keith Aucoin, Jeff Halpern and Alexander Semin also found the net as the Capitals notched their second straight win.
Michal Neuvirth nailed down the victory with 28 saves.
The Leafs, who came into the contest clinging to the eighth and final playoff slot in the Eastern Conference, lost for the eighth time in nine games.
Boston schools pull out free condoms over wrapping complaints
Ray Liotta sues skin care company over use of likeness