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Ryane Clowe spoiled Dubnyk's shutout bid, scoring with 3:02 left.
"When it was 5-0, the thought started to creep in," Dubnyk said. "Just a little bit. I didn't get too excited about it. Maybe if I had 20 wins, I might have been a little more desperate to get my first shutout. I was just happy to get another win. Right now I'm just happy to have that winning feeling."
San Jose, coming off losses at Vancouver and Calgary, is 0-5-1 in its past six.
"The frustration level is growing as the days go on," Sharks coach Todd McLellan said. "We didn't really show a lot of emotion in the game until the end of it when it didn't really matter. I'm tired of hearing in our locker room and around the team that adversity is good for us and will pay off in the end.
"It's not going to unless we dig ourselves out of it. There is something missing right now, and we have to figure what it is pretty darn quick."
The Sharks have dropped a point behind Chicago and Phoenix in the race for the top spot in the Western Conference.
"It was quite embarrassing to be honest, to lose that way," goalie Evgeni Nabokov said. "I don't know if this is rock bottom or not, but we are certainly hoping it is. Hopefully we can get back to climbing the hill after this. I think the confidence level is nowhere to be found right now and we have to find it."
On Friday night, Dubnyk beat Detroit in a shootout for his first victory in 14 NHL appearances. He's 2-8-2 overall in his first NHL season.
"This is as close to playoff hockey as we're going to get this year, playing teams that are battling for playoff spots," Oilers forward Sam Gagner said. "We want to treat these situations like playoff games for us, and in the future maybe pull from these experiences."
San Jose had most of the early pressure, including Joe Pavelski's shot that hit the crossbar behind Dubnyk, but Edmonton that struck first, 11:10 into the first period.
Nilsson poked the puck away from Joe Thornton and went in alone, making a nice move on Nabokov to score his 10th goal of the season.
Edmonton made it a two-goal game just over a minute later when the rebound from Ryan Potulny's shot caromed off a defender to Penner on the doorstep, and he slammed it home for his 100th NHL goal.
San Jose had a terrific opportunity to cut into the lead with two minutes left when Dany Heatley had a clear lane to the net, but couldn't slide the puck under a scrambling Dubnyk.
The Oilers went up 3-0 midway through the second period. Horcoff spotted Tom Gilbert in the slot, and while Nabokov was able to make a glove save on that shot, Pisani was in tight to lift home the rebound.
The Oilers put the game away with seven minutes left in the third when Ethan Moreau made a great pass through the crease to Horcoff at the other post to make it 4-0.
Edmonton made it a five-goal rout with five minutes left when Johnson scored on a shot from the point while the teams were playing four-aside.
|Fernando Pisani lifts the puck over Evgeni Nabokov and pushes Edmonton's lead to 3-0. (Getty Images)|
|San Jose (43-19-10)||0||0||1||1|
|Edmonton (23-42-7) «||2||1||2||5|
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|11:10||Robert Nilsson (10), Wrist Shot, Unassisted.|
|12:23||Dustin Penner (27), Backhand Shot. Assist: Potulny, Pouliot|
|10:14||Fernando Pisani (4), Slap Shot. Assist: Gilbert, Horcoff|
|12:52||Shawn Horcoff (12), Snap Shot. Assist: Moreau, Pisani|
|15:05||Aaron Johnson (4), Slap Shot. Assist: Penner, Cogliano|
|16:58||Ryane Clowe (18), Slap Shot. Assist: Boyle, Thornton|
|05:58||Stortini, 5 min, Fighting|
|05:58||Staubitz, 5 min, Fighting|
|09:38||McGinn, 2 min, Roughing|
|09:38||Potulny, 2 min, Roughing|
|04:22||Clowe, 2 min, Slashing|
|11:26||Chorney, 2 min, Holding|
|19:50||Johnson, 2 min, Hooking|
|13:55||Murray, 2 min, Interference|
|14:37||Gilbert, 2 min, Tripping|
|17:00||Murray, 5 min, Fighting|
|17:00||Stortini, 5 min, Fighting|
|17:15||Comrie, 5 min, Fighting|
|17:15||Nichol, 5 min, Fighting|
|18:17||Cogliano, 2 min, High-Sticking|
|20:00||Strudwick, 2 min, Slashing|
|20:00||Clowe, 2 min, Roughing|
|Shots On Goal|
|Attendance - 16839|
|Referees - Dan Marouelli, Marc Joannette|
|Linesmen - Shane Heyer, Mike Cvik|