Atlanta United star Josef Martinez scored in a 12th straight MLS game in a win over Orlando City.
After winning the Campeones Cup midweek, Atlanta United defeated Portland Timbers in MLS on Sunday.
LA Galaxy ended their three-game losing streak in MLS thanks to Zlatan Ibrahimovic's double against Dallas.
Chicago Fire claimed a narrow win over Montreal Impact thanks to Bastian Schweinsteiger's late goal.
Philadelphia Union captain Alejandro Bedoya called out Congress during a game after mass shootings rocked the United States.
Lassi Lappalainen, on loan from Bologna, helped Montreal Impact crush Philadelphia Union on his MLS debut.
Gonzalo Martinez came off the bench to break the deadlock in the 89th minute before Josef Martinez sealed Atlanta United's victory.
Wayne Rooney and Lucas Rodriguez helped DC United to a comfortable MLS win over Cincinnati.
Jefferson Savarino guided Real Salt Lake to a crushing victory over Philadelphia Union on Saturday.
The Portland Timbers moved off the bottom of the Western Conference with a win over Dallas.