The two sides traded second half goals as Portland was able to put the final nail in the Dallas season on a goal in the final minutes of the match.
Five minutes into the match Dallas had a free kick from Mauro Diaz that was cleared out to Kellyn Acosta. The Dallas Homegrown whipped in a long cross to Fabian Castillo who then crossed the ball back across goal where Matt Hedges nearly got a head on the play. Portland would settle the ball and clear it out.
In the 31st minute Acosta curled in a ball from the flank to David Texeira, the Dallas striker was wide open for a header but Portland keeper Adam Kwarasey would make a big stop to keep Dallas out of the back of the net.
Portland made the breakthrough in the second half though on a goal from Fanendo Adi in the 54th minute. The Portland striker got the ball in the penalty box from Darlington Nagbe after Walker Zimmerman fell down in the penalty box. Adi got the ball and made one quick turn and placed the ball in the back of the net.
Dallas gained one back in the 68th minute on a wonderful set up by Diaz. The Dallas midfielder took the ball 30 yard out from goal and chipped in a perfect ball over the Portland defense to the run of Ryan Hollingshead. The Dallas fullback took one touch and put the ball in the back of the net.
Dallas took the lead in the 72nd minute on a free kick from Diaz. The ball was sent in over the Portland wall where Blas Perez was there to head in the ball into the back of the net for his first goal since May.
Portland got the final dagger in stoppage time from subsitute Lucas Melano. Dallas bring soft pressure on Melano on a give and go with Diego Valeri. Melano got the ball in the penalty box and made a move around Dallas keeper Jesse Gonzalez and would then poke it into the back of the net.
The loss on aggregate ends Dallas' season short of a MLS Cup.