Chris Rolfe was the hero as DC United defeated New England Revolution in a top-of-the-table clash.
D.C. United strengthened its hold on top spot in the Eastern Conference, while Real Salt Lake stunned Sporting Kansas City 2-1 in MLS.
A stoppage-time goal from substitute Olmes Garcia saw RSL triumph at home against Sporting, after the visitor had watched local goalkeeper Nick Rimando deny it an almost certain goal in the final half-hour.
Earlier, in Sunday's premier fixture, DC moved seven points clear in the East's standings with a come-from-behind 2-1 win over New England Revolution in the capital.