Mantha, Nyquist, Helm find back of net for Detroit.
Detroit snaps losing streak on road.
Athanasiou scores twice for Detroit, which is 1-6-2 in last 9 games.
Washington 9-0-2 in last 11 games against Detroit.
Detroit tops Nashville 4-3 to shake six-game winless streak.
Gaudreau’s goal with 10:23 to play sends Detroit to sixth consecutive loss.