The journeyman striker headed in the game's lone goal as Seattle got by without forwards Clint Dempsey and Obafemi Martins.
Enter Chad Barrett, he of the $80,000 base salary.
The journeyman striker scored the lone goal as the Sounders (11-3-2) extended their lead atop the Supporters' Shield race with a 1-0 win over D.C. United (7-5-4) at RFK Stadium.
United came closest in the 25th minute when Chris Rolfe rang the far post with a low, one-time volley from the top of the box.
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But it was the Sounders who struck first, with Barrett rising to nod home Gonzalo Pineda's left-footed service from the right flank.
United defender Chris Korb found himself in alone on goal with a chance to equalize in the 68th minute, but a poor first touch killed the opportunity.
Seattle is now 4-0-1 since Dempsey and defender DeAndre Yedlin departed for World Cup duty with the U.S. national team.