Los Angeles FC and the Houston Dynamo scored five goals each on a high-scoring day in MLS, while Zlatan Ibrahimovic and the LA Galaxy were upstaged by Atlanta United.
LAFC rallied to a 5-3 victory over a 10-man Montreal Impact side, having trailed 3-1 at halftime away from home on Saturday.
The visitors from Los Angeles were staring at their third defeat in four games after Ignacio Piatti's first-half hat trick put the Impact in control.
But Laurent Ciman's stunning free-kick against his former team before the half-hour and a red card to Jukka Raitala gave LAFC a glimmer of hope heading into the second 45 minutes.