Sporting Kansas City scored two goals in three minutes during the closing stages as they came from behind to stun the Chicago Fire 4-3.
Felipe Gutierrez put the visiting side ahead inside 10 minutes and Johnny Russell doubled the lead just before the break for Sporting Kansas City.
Bastian Schweinsteiger set the stage for a comeback by setting up Aleksandar Katai for Chicago's first on 70 minutes, and the floodgates opened for the Fire. Two goals from Nemanja Nikolic followed, putting the home side in front in the 82nd.
But the fireworks were far from over.