Swallows and Sundowns produced a six-goal thriller, with the game ending 3-3, and The Dube Birds go into the second leg at Dobsonville Stadium next Sunday with a much needed away-goals advantage.
Speaking to KickOff.com, Marques praises his players for what he terms an "excellent performance" against the Brazilians.
"I am very happy, especially after a lot of critism following our 3-1 defeat against Platinum Stars last week," Marques says.
"Sundowns are a quality side but we came here to play football. I think my players showed a great attitude and character today and overall I was pleased with our performance.
"They had a penalty and committed some silly mistakes but that's part of football."
Marques says they will go into the second leg with extra caution, as Sundowns are also entirely capable of scoring three in The Birds' backyard.
"If we can score three goals away from home, then Sundowns can also do a similar thing. This was only the first half, and now we are going for the second half in Dobsonville.
"We look forward to scoring goals at home to qualify for the final."