Seattle would advance to the Conference finals thanks to the away goal that they scored in Frisco in the first leg. This was the first year MLS used the away goals in the playoffs.
Both teams came out with a lot of energy early in the match. Eight minutes into the match Fabian Castillo got FC Dallas' first real chance of the game as he took the ball on the right wing and broke through into the penalty box. But as Zach Scott came over to assist Leo Gonzalez, Castillo took a shot that would sail wide of the goal.
Seattle would nearly get their first breakthrough of the night 27 minute in on a corner kick. The initial ball was cleared out but only to Chad Marshall who would send it back towards goal. The ball would beat Chris Seitz but luckily for Dallas, Michel was on the goal line to clear it out.
The Sounders would get another dangerous look in the 40th minute as Obafemi Martins and Clint Dempsey would play a quick one-two combination with one another into the penalty box. Martins would find Dempsey right at around the penalty spot but his shot was right at Seitz.
Castillo would get another chance around the hour mark in this game. Dallas would break towards the penalty box as Castillo would make one good move towards Frei's goal but his shot would miss the far post and go out.
Dallas would throw everything forward in the final moments on the game but Seattle would hold off with saves from Frei and his defense clearing out the numerous set piece chances.
Seattle will advance to play the LA Galaxy next weekend while FC Dallas ends their season.