The Timbers were undone by injuries and the Dynamo attack on Sunday night.
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The Houston Dynamo stunned the Portland Timbers to advance to the next round of the playoffs.
After a scoreless first leg, the Timbers and Dynamo will square off in the second leg on Sunday at Providence Park.
The Timbers got their clean sheet in Houston, now their depth will be tested in the second leg thanks to a rash of injuries.
The Houston Dynamo and Portland Timbers now have it all to do after a 0-0 draw at BBVA Compass Stadium on Monday evening in their semifinal first leg.
The Portland Timbers and Houston Dynamo both bring powerful attacks into play on Monday.
Despite flying under the radar, the Portland Timbers emerged from the regular season as the top team in the Western Conference.