The Capitals struck early in each of the first two periods. They got on the board right away when Wilson was credited with Washington's first goal 2:13 in. A shot by Trevor van Riemsdyk went off Ovechkin's stick and then off Wilson's elbow to beat Tokarski.
Then at the 2:30 mark of the second period, McMichael's shot from the slot went in off Sabres defenseman Christian Wolanin as he battled in front and in the net.
Eakin picked up a loose puck inside the Washington blue line at the 3:43 mark of the second and wristed in a shot to get Buffalo within one.
Ovechkin's goal came 8:55 into the second when he stood in the high slot and deflected in a Dmitri Orlov shot to make it 3-1.
Buffalo started the third period off on the right foot. Bjork put one in 3:17 into the period after a wild scramble in front. Buffalo had at least five chances before Bjork, at the top of the paint, knocked the puck out of the air and past Vanecek.
Tom Wilson found himself all alone in front and put a feed from Evgeny Kuznetsov five hole to allow Washington to regain its two-goal lead at the 6:45 mark.
Sheary deflected in a point shot from John Carlson with 2:13 left to make it 5-2.
Miller's point shot with 1:04 left came off a faceoff in the Capitals zone to close out the scoring.