Sophia Smith scored an early goal and the Portland Thorns controlled play throughout the match while recording a 2-0 victory over the Kansas City Current to win the NWSL championship match on Saturday night in Washington.
Portland's other tally came on an own goal by Kansas City's Addisyn Merrick.
Portland is the first three-time champion in the NWSL's 10-season history. The Thorns also won in 2013 and 2017.