Wall provided three steals and two blocks and Ariza sank four 3-pointers as the Wizards improved to 2-0 on a five-game homestand.
Kevin Seraphin helped out with 19 points.
The Trail Blazers dropped a third in four games despite 25 points, eight assists and six rebounds from Damian Lillard.
LaMarcus Aldridge provided 20 points, 10 rebounds and six assists.
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