Rapinoe scored in the 16th minute off a pass from Jess Fishlock on a quick counter attack. She added a second goal on a penalty kick in the 40th minute. Rapinoe missed several chances at a possible hat trick, including a wide open header in the 60th minute that went wide of the net.
Fishlock celebrated the victory by emphatically dropping a bouquet of roses on the turf after the final whistle.
Portland’s Angela Salem scored off a free kick in first-half stoppage time for the Thorns’ only goal. OL Reign goalkeeper Sarah Bouhaddi made a key save on Portland’s Morgan Weaver in the 80th minute to maintain the lead.
Portland had been unbeaten in its previous 10 games.
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