FC Dallas claimed top spot in the MLS Western Conference after overcoming Los Angeles FC, while the Philadelphia Union had two players sent off in their loss to Atlanta United .
In-form Dallas moved ahead of Sporting Kansas City by a point in the west thanks to Saturday's 2-1 victory against 10-man LAFC – the club extending its unbeaten streak to six games.
Former Tottenham defender Reto Ziegler opened the scoring with his first MLS goal in the 25th minute – the Dallas left-back heading a stray ball past Tyler Miller at Toyota Stadium.
Roland Lamah doubled the lead six minutes into the second half courtesy of a well-taken finish inside the penalty area.
Adama Diomande came off the bench and pulled a goal back 10 minutes later but LAFC – which had substitute Jordan Harvey sent off for a second yellow card in the 89th minute – slumped to a fourth successive match without victory.
Josef Martinez scored a hat trick as Eastern Conference leader Atlanta stayed top via a 3-1 win at home against nine-man Philadelphia.
A first-half penalty triggered a wild sequence for the Union, who had Alejandro Bedoya and Haris Medunjanin both sent off for arguing the referee's decision in the 19th minute.
Martinez converted the spot kick before completing his fifth hat trick in the second half as Atlanta maintained a two-point lead atop the east following New York City's 3-0 victory over struggling Orlando City.
Zlatan Ibrahimovic – who scored twice in a 3-2 loss to Dallas last time out – started on the bench in the LA Galaxy's 1-1 draw against the Portland Timbers, while Sebastian Giovinco scored a stunning free-kick as Toronto surrendered a three-goal lead in a 3-3 draw against the Columbus Crew.
The Montreal Impact edged the Houston Dynamo 1-0, Real Salt Lake accounted for the Seattle Sounders 2-0, the Chicago Fire defeated the San Jose Earthquakes 2-1 and the New England Revolution trumped the New York Red Bulls by the same scoreline.