New York City keeper Sean Johnson was the hero but top scorer Valentin Castellanos was sent off late and will miss the Conference finals.
Despite Chicharito's heroics, the LA Galaxy were left emptyhanded on Sunday as RSL spoiled the party in the 95th minute.
Down a goal and a man after 57 minutes, Colorado Rapids rallied to stun Minnesota United.
Seattle Sounders are back on top in the west, while Inter Miami face a battle to reach the post-season.
Johnny Russell scored and assisted two others as Sporting KC found the back of the net at home for the 28th consecutive regular-season game.
Philadelphia Union midfielder Alejandro Bedoya called on Congress to protect USA's citizens after a spate of gun violence incident