After losing to New England Revolution prior to the international break, LA Galaxy accounted for FC Cincinnati on Saturday.
LAFC crashed the re-opening of Portland's Providence Park on Saturday – star Carlos Vela scoring again to lead the visitors.
DC United are a point clear atop the Eastern Conference after earning a draw at New England Revolution.
Josef Martinez's penalty helped Atlanta United edge the Vancouver Whitecaps in MLS.
Former Sporting CP star Fredy Montero broke the deadlock in the ninth minute to extend hosts Vancouver's unbeaten streak to three matches.
Atlanta United overcame fellow strugglers and winless Colorado Rapids 1-0 courtesy of Julian Gressel on Saturday.
Atlanta were upstaged by FC Dallas 2-1 on Saturday – leaving Frank de Boer's side without a victory at home in the league this season.
Carlos Vela set up one goal and scored another as Los Angeles FC continued their rich vein of form in MLS.
Nani converted an 89th-minute penalty as Orlando City prevailed 4-3 in a thriller for their first home win of the season on Saturday.
LA Galaxy's Zlatan Ibrahimovic was 100 per cent from the spot after Wayne Rooney produced a moment of magic for DC United.