Agosta scored in the second period to tie the game 1-1 and then Canada added the go-ahead goal 93 seconds later on a shot that U.S. goalie Jesse Vetter seemed to have stopped, drawing a whistle from referee Anna Eskola of Finland. But the puck trickled through Vetter’s pads and over the goal line.
Video — and presumably audio — review confirmed the puck went into the net before the whistle.
Charline Labonte made 25 saves for Canada.
Hilary Knight scored and Vetter stopped 28 shots for the United States.