INNSBRUCK, Austria (AP) – Defending champion Canada and Russia struggled Saturday in winning their opening games at the hockey world championships.

Canada, trying to win a third straight world title for the first time since 1950-52, held off Latvia 6-4 behind three goals by Rick Nash at Innsbruck’s Olympiahalle, site of two Olympic tournaments.

“Anyone can see that we can play a lot better,” said Canadian defenseman Sheldon Souray, who played in Sweden this season during the NHL lockout.

Russia, which defeated Sweden in last week’s European Hockey Tour final, beat Austria 4-2 after the host nation tied the score midway through the third period.

The United States, bronze-medal winners at last year’s worlds, faces Slovenia on Sunday.

Canada led 5-2 after two periods and appeared headed to an easy victory. But Janis Sprukts and Karlis Skrastins beat Canadian goalie Martin Brodeur in a 2:44 span midway through the second period to get Latvia within a goal.

“We have a good team in this locker room so I wasn’t worried,” said Joe Thornton, who scored one of three power-play goals for Canada in the second period. “Even when the score was 5-4, you can’t get nervous with the team we’ve got. We knew we were going to get the next goal.”

Nash, who played in Switzerland this season, completed his hat trick with less than six minutes left, tapping in a low, soft shot past NHL goalie Arturs Irbe, who replaced starter Edgars Masalskis after Canada took a 5-2 lead.

“We gave up four power-play goals,” Latvian coach Leoniz Bresnevs said.

Brendan Morrison, who also played in Sweden this season, scored for Canada 2:55 into the game with a power-play goal. Aleksandrs Semjonovs tied it 1-1 just 34 seconds later. Patrick Marleau restored Canada’s lead 7:49 into the second period and Girts Ankipans tied it a second time 3:06 later.

“We’re not where we want to be yet,” Canada coach Marc Habscheid said. “We forced a lot of pucks, we created some turnovers for the Latvians and they jumped on the opportunities.”

“We’re happy we got the win. We learned a few things tonight,” he added. “We have to clean up a certain areas of our game.”

Alexander Ovechkin, Alexander Kharitonov, Alexei Kovalev and Ilya Kovalchuk scored for Russia.

“We had a good start into the match, but failed to close the game early,” Russian coach Vladimir Krikunov said. “Nonetheless, we got the win and that’s all that matters. After all, our aim is to win gold and that is only possible by defeating everyone in our way.”

Ovechkin’s opener was matched by a power-play goal from Oliver Setzinger in the first period before Kharitonov put his team ahead again. Early in the third, Raimund Divis surprised Russian goalie Maxim Sokolov with a shot from a sharp angle to make it 2-2.

Two late goals saved Russia. With less than four minutes left, Kovalev converted a break to give Russia the lead again and Kovalchuk added an empty-netter in the final seconds.

Despite losing, Austria received a standing ovations from a capacity crowd of nearly 10,000.

“It always looks unlucky to miss a tie if you come so close,” Austrian coach Herbert Poeck said. “But the Russians dominated the first half of the game and so I was very happy with the way my team came back.”

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Associated Press writer Harry Miltner in Vienna contributed to this report.

AP-ES-04-30-05 1605EDT