SEATTLE -- The Seattle Sounders had a chance to claim the best record in MLS on Wednesday.
Instead, for the second consecutive game, Seattle looked like the league's worst.
Kekuta Manneh, an 18-year-old rookie, scored the first hat trick in Vancouver Whitecaps history and Nigel Reo-Coker added another goal as the rivals to the north breezed to a 4-1 victory in front of 38,833 at CenturyLink Field.
The attendance number is deceiving, however, as many fans didn't endure the humiliation all the way to the final whistle.
It marked the second-worst home defeat in Sounders FC history, eclipsed only by a 4-0 defeat against the Los Angeles Galaxy on May 8, 2010 -- an embarrassment so bad it resulted in a refund of sorts.
Seattle (15-10-6) is winless in four games, including three defeats, and failed to clinch the Cascadia Cup. The only way the Sounders can win the regional competition is by beating the Portland Timbers on the road Sunday, otherwise Vancouver claims the trophy.
Trailing by three goals in the second half, the home team pushed all bodies forward for a comeback, also bringing in Clint Dempsey and Steve Zakuani off the bench.
The pressure created a number of chances, first when defender Patrick Ianni rattled the cross bar with a powerful header off a corner kick in the 67th minute.
Seattle wouldn't miss the next great look when midfielder Mauro Rosales slammed home his fourth goal of the season off a rebound in the 69th minute. The hosts nearly struck again two minutes later, when Rosales set up DeAndre Yedlin inside the penalty box, but Yedlin hesitated and his shot was stopped by Whitecaps goalkeeper David Ousted.
Any hope of heroics ended in the 82nd minute, however, when Reo-Coker converted a breakaway chance through the legs of Sounders goalkeeper Michael Gspurning.
A fitting end to a team record 14-game home unbeaten streak (10-0-4).
When including the 5-1 road defeat Saturday in Colorado, it was by far the Sounders' worst two-game stretch.
Vancouver (12-11-9) had come in on a lowly 1-4-3 streak in the past eight games and had never won here since joining MLS in 2011.
The Whitecaps raced to a 1-0 lead in the 12th minute, pouncing on a poor clearance by Seattle defender Jhon Kennedy Hurtado. The ball came to Vancouver's Daigo Kobayashi, who slipped a pass to Manneh in behind Hurtado for the breakaway goal.
The damage doubled in the 42nd minute when a Seattle giveaway sparked a quick passing sequence up the field from defender Lee Young-Pyo to forward Camilo and then to Manneh for another one-on-one finish against Gspurning.
-- Reports from U.S. national team camp Wednesday were that Seattle forward Eddie Johnson limped out of practice, perhaps due to a groin injury. No further updates were made available. Brad Evans also is away with the USMNT.
-- Leo Gonzalez missed his third consecutive game with a hip/groin injury. Fellow defender Zach Scott sat out due to suspension.
-- Dempsey made his first appearance since Sept. 13, having missed the past three games with a hamstring injury. Zakuani came on as a substitute in the second half, making his first appearance since April 20.
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