Jason Chimera and Mike Knuble each registered a goal and an assist for the Caps, who maintained their two-point lead over Buffalo in the competition for the eighth and final Eastern Conference postseason berth.
The Sabres routed Tampa Bay 7-3 Monday.
Braden Holtby turned aside 30 shots for the Capitals, who also pulled to within three points of Florida atop the Southeast Division with the victory.
The Red Wings fell to 0-4-1 in their last five games but remained tied with Nashville for the fourth spot in the West.
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