(Portland, OR)  --  The Portland Timbers will square off with the Seattle Sounders in the fourth round of the U.S. Open Cup.  The two soccer clubs meet on June 16th at Starfire Sports Complex in Tukwila, Washington for the 2015 Lamar Hunt Cup.  The Timbers and Sounders are the only MLS teams that must face an MLS opponent in their opening U.S. Open Cup game this year.