Marcoux, from Sault Ste. Marie, Ont., took first place in a time of one minute 29.68 seconds. Mark Bathum from the United States was 2.21 seconds off the pace of Marcoux and finished second while Miroslav Haraus of Slovakia took bronze in 1:32.89.
"It's been a good day," said Mac Marcoux. "Experiencing this with BJ is awesome. Today is the first win above the Nor-Am level with BJ and it's the world championships. The downhill is now complete and such a great result has lifted a little weight off our shoulders, building our confidence leading into tomorrow's race."
Mac Marcoux, 17, has continued build upon his dream season.
The Sochi 2014 Paralympic three-time medalist has landed on the podium a total of eight times during the 2014-15 season— first place (five times), second place (once) and third place (twice)— resulting in securing the coveted Crystal Globe and title of Overall World Cup athlete.