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Darren Mattocks scored the winner as DC United came from behind to beat Minnesota United in MLS.
Darwin Quintero and Christian Ramirez starred as Minnesota United routed high-flying Los Angeles FC.
Midweek honours went to Minnesota after Christian Ramirez and Darwin Quintero both scored in the first half at TCF Bank Stadium.
A Roland Lamah header helped Dallas overcome Minnesota United 1-0 in MLS.
"I'll be announcing for the first time publicly that I am an openly gay player in Major League Soccer," Martin wrote on Twitter.
Daniel Salloi, Wan Kuzain, Cristian Lobato and Diego Rubio helped extend Sporting Kansas City's unbeaten streak in MLS on Sunday.
Atlanta United's eight-match unbeaten run was ended by Sporting Kansas City, while Toronto were bested by Seattle Sounders.
The New York Red Bulls were too good for Minnesota United thanks to a Bradley Wright-Phillips brace.
Minnesota United's poor start to the MLS season continued as Columbus Crew enjoyed an entertaining win.