ST. LOUIS (AP) _ The Vancouver Canucks had nothing to show for the first two periods. Then they got going.
Magnus Arvedson scored two goals for the second straight game and the Canucks extended their winning streak to four Thursday night with a 4-2 victory over the slumping St. Louis Blues.
``I think it was a case where we had a great third period and they wore out,'' Vancouver coach Marc Crawford said. ``That happens in the league and you've got to be prepared for it.''
Daniel Sedin had a goal and two assists for Vancouver. Arvedson and Markus Naslund sparked the Canucks' four-goal third period, scoring in a span of 1:42 to end Chris Osgood's shutout bid and put Vancouver ahead.
Arvedson scored his eighth goal of the season, and fourth in three games since returning from a six-game absence due to a herniated disc, for a two-goal gap midway through the third. He's not sure where the offense is coming from.
``I don't know, don't ask me,'' Arvedson said. ``It feels good, I can't lie about that. Not only the goal scoring but I feel real comfortable with the puck.''
Mark Rycroft and Keith Tkachuk scored for the Blues, who are 0-4-1 in their last five games and 5-11-5 in their last 21. They've totaled 10 goals in their last seven games, and lost when leading after two periods for only the second time all season, falling to 19-2-2.
``We're at the bottom of the barrel right now,'' forward Dallas Drake said. ``We're looking for any answer we can get.''
Osgood is 1-9-4 with two no-decisions since Dec. 18.
Sedin scored on a breakaway to finish off the Canucks' big third period, which erased a 1-0 deficit, and assisted on both of Arvedson's goals.
Rycroft gave the Blues the lead at 9:58 of the second period with his seventh goal _ and first point in seven games.
``That was nice,'' Rycroft said. ``It was a good start, anyway.''
Arvedson tied it at 2:11 of the third on the receiving end of two long passes, the first from Brian Allen near the Vancouver goal and the next tapped ahead by Sedin at center ice.
The Canucks had been 0-for-6 on the power play, including 1:50 of a two-man advantage early in the first period, before Naslund broke the tie. He scored his 28th goal on a one-timer from the right side of the net off a feed from Brendan Morrison.
Arvedson made it 3-1 at 10:52 with a shot from the right side that deflected off the shin pads of defenseman Chris Pronger and scooted between Osgood's pads. Tkachuk cut the gap to one at 12:16 off a setup from behind the net by Drake, but Sedin broke free and answered for the Canucks at 16:52.
``They just threw the puck out in front and I was right there,'' Sedin said. ``I wasn't that fast, but I was fast enough.''