An 88th-minute goal from late substitute Nelson Valdez lifted the Sounders to a 1-0 win over Sporting Kansas City in the Western Conference knockout round of the MLS playoffs.
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Missed opportunities and a second-half red card for captain Osvaldo Alonso kept the Sounders from clinching a playoff spot against the Houston Dynamo on Wednesday night.
With a 1-0 win over the Chicago Fire at CenturyLink Field, the Seattle Sounders moved into the sixth and final Western Conference playoff spot.
On Tuesday the Sounders announced an irregular heartbeat will sideline Clint Dempsey for the remainder of the season, posing difficult near- and short-term questions for the club.
The Seattle Sounders kept their playoff hopes alive with a critical 1-0 win over the Vancouver Whitecaps at CenturyLink Field on Saturday afternoon.
A pair of Clint Dempsey goals fueled the Sounders to a 3-1 victory over the visiting Portland Timbers at CenturyLink Field on Sunday night.
Nicolas Lodeiro scored his first goal in MLS on Sunday, as the Seattle Sounders topped Real Salt Lake in front of 39,491 at CenturyLink Field.