Danny Musovski scored a goal for the second consecutive game and Stefan Frei had eight saves Saturday to help the Seattle Sounders beat Nashville SC 3-0.
Albert Rusnák scored on a penalty kick, Jordan Morris added an insurance goal and Stefan Frei posted his 12th career clean sheet in the postseason as the Seattle Sounders beat FC Dallas 2-0 in a series opener.
Yohei Takaoka finished with five saves for Vancouver to offset Stefan Frei's league-leading 13th clean sheet of the season as the Whitecaps played the Seattle Sounders to a scoreless draw.
Defender Yeimar Andrade gave Seattle a first-half lead, but his own-goal early in the second half helped Minnesota United gain a 1-1 draw with the Sounders.
Cristian Espinoza scored on a first-half penalty kick and assisted on a second-half goal by Miguel Trauco to lead the San Jose Earthquakes to a 2-0 victory over the Seattle Sounders.
Seattle's Stefan Frei finished with three saves for his league-leading 10th clean sheet of the season and Pedro Gallese saved two shots as Orlando City played the Sounders to a scoreless tie.
Jeremy Ebobisse scored out of the gates in the second half and Daniel de Sousa Brito made it stand up as the San Jose Earthquakes snapped a 14-match winless skid on the road with a 1-0 victory over the Seattle Sounders.
Pedro Vite scored just before halftime and the Vancouver Whitecaps used an own-goal by Seattle goalkeeper Stefan Frei in the second half to post a 2-0 victory over the Sounders.
Erik Thommy had a goal and an assist, Alan Pulido scored his first goal in nearly two years and Sporting Kansas City stunned the Western Conference-leading Seattle Sounders with a 2-1 victory.