The Capitals had just two shots on net in the final 15:40 of the second, but they shut down the first two Toronto power plays of the night without permitting as much as a shot on net. The third Leafs power play came when Niskanen was sent off for slashing Kadri in the final minute of the second.
In the final second of the second, Nylander finally managed Toronto's first shot on goal with the extra man.
At 7:36 of the third, Caps winger Tom Wilson was boxed for an offensive-zone hi-sticking minor on Martin Marincin. It was Wilson's fourth minor of the night and the second one that resulted in a Toronto power play.
During the power play, Holtby had to make a brilliant one-on-one stop on James van Riemsdyk while Wilson sweated it out in the box and the game remained even at 1-1.
Wilson got just one more shift thereafter; he was parked on the pine for the second half of the third period.
Kuznetsov and Williams both had excellent chances in the final minute of regulation, but Andersen had the answer both times. That set the stage for Williams' heroics on his very next shift, the one following the intermission.