Sporting Kansas City's clash with Colorado Rapids descended into chaos in stoppage time, with four players being sent off between the 90th minute and full-time.
Daniel Salloi had scored either side of a Lucas Esteves goal in regular time, sealing a 2-1 victory, but heads were lost before the referee blew his whistle for the final time.
Aaron Trusty, Andreu Fontas, Esteves and Salloi were all shown red for their part in violent exchanges between two heated sets of players.
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