PORTLAND, Ore. (AP) — Lynn Williams scored twice in overtime and the Western New York Flash beat the Portland Thorns 4-3 on Sunday for a spot in the National Women's Soccer League championship game.

The Flash will play the Washington Spirit for the league title next Sunday in Houston. The Spirit beat the Chicago Red Stars 2-1 in overtime in the other semifinal Friday night.

Emily Sonnett scored the equalizer for the Thorns in the 78th minute. The Flash led 2-1 at the half after goals from Samantha Mewis and Makenzy Doniak. Christine Sinclair's goal narrowed it for Portland in the 115th minute

Williams, who won the league's Golden Boot award for most goals in the regular season, scored in the 98th and 103rd minutes after a 2-2 draw in regulation. Lindsey Horan added a goal for the Thorns in the 115th minute to narrow the gap but Portland couldn't catch up.

New York coach Paul Riley, who was the Thorns in 2014 and 2015, was ejected in the 40th minute after an interaction with the referees.