WASHINGTON (AP) -Nick Tarnasky scored the lone shootout goal in the 10th round, goalie Johan Holmqvist was perfect in 10 chances during the tiebreaker and the Tampa Bay Lightning opened their longest road trip of the season with a 5-4 victory over the Washington Capitals on Thursday night.

Tarnasky sent a low shot between Brent Johnson's pads to help the Lightning improve to 10-1 in shootouts. It was Tarnasky's first career shootout attempt.

Washington is 1-10 in shootouts.

With 3:18 left in regulation, Martin St. Louis scored to give the Lightning a 4-3 lead, taking a pass from Vincent Lecavalier, getting a step on Milan Jurcina in the slot and poking in a falling-down shot past Johnson.

But Alexander Semin tied it with 10.9 seconds left, on a left-post attempt that went in off defenseman Nolan Pratt's stick. The Capitals had pulled Johnson and were on a two-man power-play for a 6-on-3 advantage.

Vaclav Prospal, Ruslan Fedetenko and Lecavalier also scored in regulation for the Lightning in the first game of a six-game trip. Tampa Bay has points in 10 of 11 road games, going 9-1-1 in that span.

Shaone Morrisonn, Alex Ovechkin and Matt Pettinger also had goals in regulation for the Capitals, who have lost three straight and eight of nine.