Lars Eller, Kevin Shattenkirk, Nate Schmidt and Tom Wilson scored as the Washington Capitals cruised to a 4-1 victory over the Maple Leafs, ending Toronto's four-game win streak.
Mitch Marner, with his 19th of the season, added a late power-play goal to deny Philipp Grubauer his fourth career shutout.
The Capitals (53-18-8) could have clinched the Eastern Conference title and Presidents' Trophy on the night.
The Bruins beat Tampa Bay 4-0 to clinch a playoff spot. Toronto (39-25-15) would have joined them with a win last night.