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Sounders win first leg of Western Conference semifinals 3-0 over FC Dallas

Forward Nelson Valdez drew first blood against FC Dallas, scoring off a header in the 50th minute.(Photo courtesy: Sounders FC Communications/Jane Gershovich)

Forward Nelson Valdez drew first blood against FC Dallas, scoring off a header in the 50th minute.(Photo courtesy: Sounders FC Communications/Jane Gershovich)

SEATTLE — Nicolas Lodeiro scored twice and Nelson Valdez added a goal — all in an 8-minute span early in the second half— and the Seattle Sounders rolled past FC Dallas 3-0 on Sunday night in the first leg of the MLS Western Conference semifinals.

Dallas, winner of the Supporters Shield with the best regular-season record, now must score at least three times when the teams play the second leg in Texas next Sunday to keep its season alive.

Valdez, whose 88th-minute goal beat Sporting Kansas City in a knockout game Thursday, put Seattle on the board in the 50th minute. Joevin Jones crossed a target ball from the left side into the penalty area. Valdez ran to the top of the 6-yard box, went up and over Dallas defender Maynor Figueroa and headed it into the back left corner.

Lodeiro made it 2-0 at the outset of the 55th minute, running onto Jordan Morris’ short crossing pass and blasting it into the back right corner from 6 yards in front.

Just 3 minutes later, Lodeiro took a through ball from Jones, streaked down the left side, and, from the top left corner of the 6, fired to the far corner.