Stefan Frei records 6 saves in scoreless draw with Union
Frei pushed Brenden Aaronson’s shot to safety in the 18th minute and corralled the rebound of a low knuckler in the 53rd for the Sounders (7-1-5).
Andre Blake needed one save to register his second clean sheet of the year for the Union (7-3-3).
Both teams had winning streaks snapped by the result. Philadelphia had won three straight and Seattle was winners of its last two.