(Tukwila, WA)  --  The Seattle Sounders are moving forward in U.S. Open Cup play after defeating the Portland Timbers, 3-1, in overtime.  The Timbers sent the game into extra time with a goal by Darlington Nagbe to tie the Sounders, 1-1.  Kenny Cooper scored on a header in the 111th minute and Marco Pappa tallied a goal five minutes later to make the difference for Seattle.  The Timbers and Sounders will play an MLS regular-season game in Seattle this Sunday night.