Seattle and Portland have a decade long rivalry for soccer dominance in the Northwest that will continue this weekend.
The San Jose Earthquakes and New England Revolution played to a scoreless draw at Avaya Stadium.
Seattle scored as seconds ticked away in stoppage time to tie Houston at 1 and come away with a point on the road.
Jozy Altidore scored and Sebastian Giovinco had two assists as Toronto FC beat Orlando City. LA Galaxy and Chicago Fire played an exciting 2-2 draw.
D.C. United grabbed a point on the road at Stade Saputo against the Montreal Impact.
Jozy Altidore's late winner continued Toronto's seven game unbeaten run as Orlando City remain without a win in August.