Salt Lake (11-4-9) moved one point ahead of Seattle (13-7-2) with its third straight victory.
After a scoreless first half, Salt Lake scored twice in a four-minute span at the start of the second. Plata, the shortest player in MLS (standing shorter than 5'2"), headed in a goal for a second consecutive game in the 53rd minute. Then Real Salt Lake got an own goal when Seattle's Ozzie Alonso was battling with Luke Mulholland inside the box.
Chad Barrett scored for Seattle in the 72nd minute after a wild sequence. Clint Dempsey's close-range attempt was blocked and Andy Rose's rebound header went off the post. Barrett finally put it past goalkeeper Nick Rimando, spoiling his bid for a third straight shutout.
The Sounders have another quick turnaround next week. They play San Jose on Wednesday at CenturyLink Field. Start time is scheduled for 7pm.