It was a memorable night for Atlanta United, which celebrated playing in its new stadium with a convincing win over FC Dallas in Major League Soccer, while reigning champion Seattle Sounders drew at home to LA Galaxy.

Expansion franchise and stuttering Atlanta christened Mercedes-Benz Stadium with a 3-0 victory against Dallas.

Having used Bobby Dodd Stadium temporarily, Atlanta moved to the newly built Mercedes-Benz Stadium – also home to NFL franchise the Atlanta Falcons – this week and snapped its four-match winless streak in front of a sell-out crowd of 45,314.

Leandro Gonzalez Pirez gave Atlanta a 14th-minute lead when he snuck in at the back post and bundled the ball home.

It took only a minute into the second half for Atlanta to double its lead after Josef Martinez side-footed past Dallas goalkeeper Jesse Gonzalez.

Miguel Almiron rattled the crossbar before team-mate Gregory Garza made it 3-0 in the 68th minute.

Atlanta occupies the sixth and final play-off spot in the Eastern Conference, while Dallas, which is in the middle of an eight-game winless run, is sixth in the west, only a point ahead of San Jose Earthquakes.

The Sounders were held to a 1-1 draw by visitors the Galaxy at CenturyLink Field in Seattle.

Lamar Neagle's 85th-minute equaliser cancelled out Gyasi Zardes' first-half opener as Western Conference high-flyer Seattle extended its undefeated streak to 12 matches.

Meanwhile, Columbus Crew and Sporting Kansas City played out a 1-1 draw.