No MLS club has won its first nine games at home, and that's the way it stayed. Seattle capped Sporting's home unbeaten run at eight thanks to two injury-time goals.
The defeat marked the end to a club-record 14-game unbeaten run and the first time Sporting had lost in its new LIVESTRONG Sporting Park. The eight games without a loss ties an MLS record, and the 14-match run ties the LA Galaxy for a season high.
The clash between these two sides earlier in the season hinged on a Jeff Parke goal in time added on. This one had two.
Kei Kamara looked to have put Kansas City on the way to another home result when he notched in the first half.
However, a red card to Omar Bravo at the hour mark opened the door, and Seattle busted through in injury time.
Mauro Rosales and Lamar Neagle scored in the 90th and 93rd minute respectively to turn the game on its head and snatch a thrilling win.