Humphries and Jennifer Ciochetti posted a time of one minute 54.17 seconds after two heats at Mount Van Hoevenberg, Lake Placid, on Friday.
Germany's Sandra Kiriasis and Petra Lammert trailed by 0.41s, with Americans Elana Meyers and Katie Eberling less than a tenth behind them.
The women’s competition continues on Saturday evening, with the men’s runs starting beforehand.
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