The Sounder center back grabbed a late winner for Seattle and the team came from behind to top Philadelphia.
A deflected cross from a free kick opened the scoring 13 minutes in, with Brad Evans putting the ball into his own net to give the Union an early lead.
A penalty save in the 39th minute kept the Union in front, with Zac MacMath diving well to push Osvaldo Alonso's attempt out.
Had it not been for several blocked shots from Chad Marshall in the first half, the Union could well have been at least a couple goals to the good before the break, and the Eastern Conference club was punished for the wasted chances in the second half.
Obafemi Martins pulled the Sounders level in the 61st, pouncing on a loose ball and finishing calmly to make it 1-1.
Marshall would wrap up a great showing in the 84th, snapping home a header from a Seattle corner to give the home side its fourth win in a row.