Johnny Russell opened the scoring on a wonderfully taken free kick. Danniel Salloi then doubled Kansas City's lead shortly before halftime on a counterattack for his team-leading ninth goal of the season.
Midfield substitute Cameron Duke added his first career MLS goal on his first touch to seal all three points for the visitors, who moved within two points of the West-leading Sounders and three of Shield leaders New England.
Fredy Montero pulled a goal back shortly after halftime with his third tally of the season for Seattle, who suffered their first home defeat in nine matches in 2021.
Two matches and a week ago, the Sounders had their 13-match unbeaten start to the season snapped in Minnesota.
- THE BIG PICTURE: Much as with the Sounders' away loss to Minnesota, an eventual home defeat was coming sooner or later for Seattle given the combination of their workload and short bench in recent weeks. It didn't hurt that it was only Kansas City's second game in five days versus the Sounders' third in eight. Meanwhile, this was easily Sporting's best away win to date, having previously defeated the LA Galaxy sans Chicharito, the San Jose Earthquakes and New York Red Bulls in reverse order.
- MOMENT OF THE MATCH: The result remained in doubt when Duke entered for Gadi Kinda in the 70th minute. It wouldn't be for long, as the 20-year-old homegrown took advantage of the Sounders' momentary defensive lapse, reached Graham Zusi's delicious ball and struck an excellent low volley past Stefan Cleveland.
- MAN OF THE MATCH: Gadi Kinda. The Israeli international was at the center of most of Sporting's best attacks during his 70-minute shift, including a swift counterattack shortly before halftime that resulted in Salloi's goal to make it 2-0. He completed nearly 91% of his passes, including a team-leading three key passes for the visitors.
- SEA: Saturday, July 31 vs. San Jose Earthquakes (5 pm ET | MLS LIVE on ESPN+)
- SKC: Saturday, July 31 vs. FC Dallas (8:30 pm ET | MLS LIVE on ESPN+)