(Seattle, WA)  --  The Seattle Sounders will move on to the second leg of their Western Conference semifinal matchup with FC Dallas, after earning a convincing 3-0 win in the first game.  Sounders FC tallied three goals within eight minutes in the second half of yesterday's game at CenturyLink Field.  Nelson Valdez scored in the 50th minute, and Nicolas Lodeiro tallied two more goals in the 55th and 58th.  The series will pick up next Sunday evening in Frisco, Texas.