Eastern Conference leaders Atlanta United may be looking over their shoulder at New York Red Bulls, while Portland Timbers finally lost.
Oscar Pareja's Dallas were led to a huge MLS win by a stunning first-half hat-trick from Roland Lamah.
Sporting KC Sporting Kansas City secured a MLS play-off berth after accounting for Chicago Fire 2-0 on Friday.
Kaka LA Galaxy are without a win in three games since Sigi Schmid's return after losing to New York City, while Kaka sensationally saw red.
Seattle Sounders MLS Cup champions LA Galaxy and Seattle Sounders provided countless memories last season and they are set to add to those when the two teams meet on Sunday.
Johnny Russell Sporting Kansas City crushed the Vancouver Whitecaps in MLS, thanks largely to Johnny Russell.
DC United DC United moved within a point of Sporting Kansas City in the East, while Real Salt Lake and New York Red Bulls completed a spiteful draw.
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