EDMONTON, Alberta -- Fernando Pisani and the Edmonton Oilers started the postseason as eighth-seeded upstarts. Now they're a win away from reaching the Stanley Cup finals in dominating fashion.

Pisani's ninth goal of the postseason helped the Oilers withstand a late rally by the Anaheim Mighty Ducks, and Edmonton won Game 3 of the Western Conference final 5-4 on Tuesday night.

The Oilers go for the sweep and their first trip to the finals since winning the Cup in 1990 on Thursday night at home.

The Oilers roared out to a 4-0 lead on goals by Michael Peca, Steve Staios and Chris Pronger in the first 5 minutes of a wild third period.

"At no point was I comfortable at 4-0 because I knew the energy level of our team," Oilers coach Craig MacTavish said. "It was a wild game we feel fortunate to have won. I've been in those situations where we haven't won.

"We've got to come in here Thursday with some fresh legs."

Anaheim came right back on goals by Sean O'Donnell, Teemu Selanne and Chris Kunitz to make it 4-3.

"Good lesson for us," Staios said. "That's a desperate hockey team, but we like the situation we're in now."

Pisani gave Edmonton some insurance with just over 5 minutes left. It turned out to be a huge goal after Selanne scored his second of the game to bring Anaheim back within 5-4.

"We made some mistakes tonight and it cost us," said Ducks head coach Randy Carlyle, singling out Salei's turnover that led to the Peca goal. "Other than that I thought we played a pretty competitive hockey game. We had lots of opportunities. We didn't get it done."

Pronger labeled it a gut-check win for a team with a number of players struggling with fatigue and flu.

"It just shows the character in the locker room," he said. "Guys are doing whatever it takes -- playing hurt, sick, whatever the case may be.

"We've got a chance to close them out Thursday but I'm sure they're going to have a lot to say about it."

Toby Petersen scored in the first period to give the Oilers a 1-0 lead.

Eighth-seeded Edmonton, which eliminated Detroit in the first round, has won seven straight since falling behind 2-0 to San Jose in the second round. It's the Oilers' longest postseason winning streak since 1990. They are 6-1 at home this postseason.

Edmonton has not yet trailed in a playoff series and already has gone deeper into the playoffs than any eighth-seeded team since the introduction of the conference format in 1994.

The Ducks have lost 13 consecutive games in Edmonton, dating back to Feb. 24, 1999.

Peca started the Oilers scoring binge in the third, tipping the puck past Ducks defenseman Ruslan Salei at the blue line and racing in alone on goalie Illya Bryzgalov. Peca beat Bryzgalov to the glove side just over 2 minutes into the period.