The Sounders have also been at or near the top of the Major League Soccer totem pole since arriving in the league eight years ago.
But there was always a void in the trophy case, at least until Saturday night.
The Sounders were crowned MLS champions on a 5-4 penalty shootout victory over Toronto FC at BMO Field after 120 minutes of scoreless play failed to decide anything.
“It’s amazing," Sounders captain Osvaldo Alonso said in a champagne-soaked visitors locker room at BMO Field. "I’ve been here for a long time and I’ve longed for this moment.